Shut-off Check valves and regulating valves for for Industrial Refrigeration

Transcription

1 Catalogue Shut-off Check valves and regulating valves for for Industrial Refrigeration Contents Page Check & stop valves, type SCA-X - Check valve, type CHV-X...3 Check & stop valves in stainless steel, type SCA-X SS - Check valves in stainless steel, type CHV-X SS Check valves, type NRVA Check valves, type NRVS DKRCI.PK.000.P H

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3 Shut-off Check & and stop regulating valve, SCA-X valves for Check Industrial valve, Refrigeration CHV-X Contents Page Features...5 Design...6 Application...6 Technical data...7 Computation and selection...7 Material specification Connections Dimensions and weights Ordering complete valves Ordering SVA-X from the parts programme Ordering CHV-X from the parts programme DKRCI.PD.FL1.B DKRCI.PK.000.P H

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5 Shut-off Check & and stop regulating valve, SCA-X valves for Check Industrial valve, Refrigeration CHV-X SCA-X are check valves with a built-in shut-off valve function. SCA-X valves are avilable in angleway versions. CHV-X are check valves only. CHV-X are available in both angleway and straightway versions. The valves are designed to open at very low differential pressures, allow favourable flow conditions and are easy to disassemble for inspection and service. The SCA-X is equipped with vented cap and has internal backseating enabling the spindle seal to be replaced whilst the valve still under pressure. Laser cut V-ports provide excellent opening characteristics (SCA-X/CHV-X ). The valve cone has a built-in flexibility to ensure a precise and tight closing towards the valve seat. A well balanced dampening effect between the piston and the cylinder gives an optimal protection during low loads and against pulsations. Features Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO 2), Propane, Butane, Iso-Butane and Ethane Modular Concept: Each valve housing is available with several different connection types and sizes. Possible to convert SCA-X or CHV-X to any other product in the FlexlineTM SVL family (Hand operated regulating valve, shut-off valve or strainer) just by replacing the complete top part. Fast and easy valve overhaul service. It is easy to replace the top part and no welding is needed Designed to open at a very low differential pressure of 0.04 bar (0.58 psig) Designed with a built-in damping chamber preventing valve flutter in case of low refrigerant velocity and / or low density Each valve is clearly marked with type, size and performance range Easy to disassemble for inspection and service Internal backseating enables replacement of the spindle seal whilst the valve is active, i.e. under pressure Optimal flow characteristics ensuring quick opening to the fully open position Protection against pulsation by built-in damping facility Housing and bonnet material is low temperature steel according to requirements of the Pressure Equipment Directive and other international classification authorities Equipped with Stainless steel bolts Max. working pressure: 52 bar g / 754 psi g Temperature range: C / F Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company DKRCI.PK.000.P H

6 Check & stop valve, type SCA-X - Check valve, type CHV-X Design Connections Available with the following connections: Butt-weld DIN (EN 10220) DN (½ - 5 in.) Butt-weld ANSI (B Schedule 80), DN (½ - 1½ in.) Butt-weld ANSI (B Schedule 40), DN (2-5 in.) Butt-weld GOST, ( and ) DN (½ - 5 in.) Socket-weld ANSI (B 16.11), DN 50 (2 in.) Housing The housing is made from special, cold resistant steel. Valve cone Valve cone with built in metallic stop - prevents damage to teflon ring in case of overtightening. Damping chamber The chamber is filled with refrigerants (gas or liquid), which provides a damping effect when the valve opens and closes. Spindle (SCA-X) Made of polished stainless steel, which is ideal for O-ring sealing. Packing Gland (SCA-X) The full temperature range packing gland is the standard for the entire SVL platform. This ensures perfect tightness throughout the whole temperature range: 60/+150 C ( 76/+302 F). Pressure Equipment Directive (PED) The SCA-X/CHV-X valves are approved according to the European standard specified in the Pressure Equipment Directive and are CE marked. For further details / restrictions - see the product instruction. Installation The valve must be mounted vertically with the cone downwards. The valve is designed to resist very high internal pressure. However, the piping system in general should be designed to avoid liquid traps and reduce the risk of hydraulic pressure caused by thermal expansion. For further information refer to installation instructions for SCA-X/CHV-X. If cold refrigeration oil having low viscosity enters and settles in the damping chamber, problems with the check valve may arise. Consequently, it may be necessary to modify the valve for more viscous liquids by enlarging the hole to the damping chamber. Example of marking ring, CHV-X SCA-X/CHV-X valves Nominal bore DN = < 25 mm (1 in.) DN32-80 mm (1¼ - 3 in.) DN mm (4-5 in.) Classified for Fluid group I Category Article 3, paragraph 3 II III Application Figure 3 shows the check & stop valve SCA-X in the discharge line of a screw compressor unit. The SCA-X valve in the discharge line prevents back condensation in the oil separator as well as pressure equalising through the compressor. SCA-X Compared to an ordinary shut-off and check valve arrangement the combined check & stop valve solution, as shown, is easier to install and has lower flow resistance. Installation of the SCA-X/CHV-X in the economizer line is not recommended. For horizontal installation of the function module; please contact Danfoss. Compressor Oil separator Oil cooler Danfoss M148G0005_1 Fig. 3 6 DKRCI.PK.000.P H11413

7 Check & stop valve, type SCA-X - Check valve, type CHV-X Technical data Refrigerants Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO 2), Propane, Butane, Iso-Butane and Ethane. Temperature range C / F. Max. working pressure 52 bar g / 754 psig. For installation in heat pump applications, please contact Danfoss. Computation and selection Example Introduction When dimensioning SCA-X/CHV-X, it is important to select a valve that is best suited to all operating conditions. Therefore, it is necessary to consider both the nominal and part load working conditions. SI-Units Assumed working conditions: Maximum flow = 1000 m 3 /h Density ρ = 3.0 kg/m 3 Minimum part load = 33% Used expressions: Recommended velocity - C rec [m/s] Minimum recommended velocity - C min, rec [m/s] Maximum velocity - C max [m/s] Part load velocity - C part [m/s] We know the density ρ 3.0 kg/m 3, consequently C rec as well as C min, rec can be found in the figure below (standard valve). C rec 14 m/s C min, rec 3 m/s The SCA-X/CHV-X valve can be calculated in two ways: Using the tables below. Using Coolselector 2 US-Units Assumed working conditions: Maximum flow = 1160 gpm Density ρ = lb/feet 3 Minimum part load = 33% Used expressions: Recommended velocity - C rec [ft/min] Minimum recommended velocity - C min, rec [ft/min] Maximum velocity - C max [ft/min] Part load velocity - C part [ft/min] We know the density ρ lb/feet 3, consequently C rec as well as C min, rec can be found in the figure (standard valve). C rec 2756 ft/min C min, rec 591 ft/min Velocity m/s [ft/min] Recommended velocity C rec = 14 m/s C rec = 2756 ft/min C min, rec = 3 m/s C min, rec = 591 ft/min Fig. 1 Not recommended ρ = 3.0 kg/m 3 ρ = lb/feet 3 Density kg/m 3 [lb/feet 3 ] Selection example continued on following page. DKRCI.PK.000.P H

8 Check & stop valve, type SCA-X - Check valve, type CHV-X Computation and selection (continued) Knowing that = 1000 m 3 /h (1160 gpm) fig. 2 gives the following choices: For SCA-X / CHV-X in size DN 100 the maximum velocity C max 31 m/s (6100 ft/min) For SCA-X / CHV-X in size DN 125 the maximum velocity C max 20 m/s (3900 ft/min) In conclusion SCA-X in size DN 125 is selected because C max 20 m/s (3900 ft/min) comes nearest to the recommended velocity C rec 14 m/s (2756 ft/min) and at the same time part load conditions fulfil the requirements, as described: lf the valve in question (for instance under part load conditions) provides a velocity less than C min, rec the valve might start hammering and become noisy. As a result the valve may wear prematurely. We know that C max 20 m/s (3900 ft/min) and that minimum part load is 33%. lt fol lows that C part 6.5 m/s (1290 ft/min). Thus, C part (6.5 m/s) > C min, rec (3.0 m/s) and the sele cted SCA-X model DN125 is the perfect choice. DN m/s [ft/min] Danfoss M148G0003_1 SCA-X/CHV-X 15 SCA-X/CHV-X 20 SCA-X/CHV-X 25 SCA-X/CHV-X 32 SCA-X/CHV-X 40 m 3 /h [gpm] DN m/s [m/s] [ft/min] Danfoss M148G0004_1 SCA-X / CHV-X 100 SCA-X/CHV-X 50 SCA-X/CHV-X 65 SCA-X/CHV-X 80 SCA-X/CHV-X 100 SCA-X/CHV-X 125 SCA-X / CHV-X 125 Fig. 2 = 1000 m 3 /h = 1160 gpm m 3 /h [gpm] 8 DKRCI.PK.000.P H11413

9 Check & stop valve, type SCA-X - Check valve, type CHV-X Material specification Danfoss M148G0008_ Danfoss M148G0009_ Danfoss 148G237_ SCA-X CHV-X CHV-X No. Part Material DIN/EN ISO ASTM 1 Housing Steel P285QH EN Bonnet, Flange Steel P275NL1 EN Bonnet, Insert Steel LF2A350 4 Spindle Stainless steel X 10CrNiS , AISI 303, 683/13 5 Cone Steel Teflon (PTFE) 6 O-ring Cloroprene (Neoprene) 7 Spindle extension Steel 8 Packing gland O-rings 9 Packing washer Aluminium Steel Cloroprene (Neoprene) 10 Spring loaded seal Teflon (PTFE) 11 O-ring Cloroprene (Neoprene) 12 Bolts Stainless steel A2-70 A Gasket Fiber, non-asbestos 14 Spring Steel 15 Identification ring Stainless steel 16 Seal cap gasket Nylon 17 Spindle seal cap Aluminium DKRCI.PK.000.P H

10 Check & stop valve, type SCA-X - Check valve, type CHV-X Material specification Danfoss 148G239_ SCA-X CHV-X CHV-X No. Part Material DIN/EN ISO ASTM 1 Housing DN Steel P285 QH EN Housing DN Steel G20Mn5 QT SEW Gasket Fiber, Non-asbestos 3 SCA-X: Valve bonnet CHV-X: End cover Steel P285 QH EN Bolts Stainless steel A2-70 A2-70 A Tube Steel 6 Seat Steel 7 Valve plate Steel 8 Guide sleeve Steel 9 Spring ring Steel 10 Spring Steel 11 O-ring Cloroprene (Neoprene) 12 Teflon ring Teflon (PTFE) 13 Soft back seal Teflon (PTFE) 14 Spindle DN Stainless steel X8CrNiS Spindle DN Stainless steel X5CrNi R 683/ /13 LF2A350 LCC, A352 LF2A350 AISI 303 AISI 304 A Packing gland Steel 9Mn28, , R 683/9 1213, SAE J Spindle seal cap and gasket Aluminium 17 Marking label Stainless steel 10 DKRCI.PK.000.P H11413

11 Check & stop valve, type SCA-X - Check valve, type CHV-X Connections Size [mm] Size [in] OD [mm] T [mm] OD [in] T [in] kv-angle [m 3 /h] Cv-angle [USgal/min] DIN Butt-weld DIN (EN 10220) ANSI Butt-weld ANSI (B Schedule 80) Butt-weld ANSI (B Schedule 40) GOST Butt-weld GOST ( and ) Size mm Size in. ID mm T mm ID in. T in. L mm L in. SOC Socket welding ANSI (B 16.11) ½ ¾ 1 1¼ 1½ DKRCI.PK.000.P H

12 Check & stop valve, type SCA-X - Check valve, type CHV-X Dimensions and weights SCA-X /CHV-X (½- 1½ in.) G B C SCA-X CHV-X H E DANFOSS 148G238_ Valve size C G D F min H Weight SCA-X SCA-X 15 (½ in.) SCA-X 20 (¾ in.) SCA-X 25 (1 in.) SCA-X 32 (1¼ in.) SCA-X 40 (1½ in.) mm kg in lb mm kg in lb mm kg in lb mm kg in lb mm kg in lb CHV-X Angleway CHV-X 15 (½ in.) mm kg in lb CHV-X 20 (¾ in.) mm kg in lb CHV-X 25 (1 in.) mm kg in lb CHV-X 32 (1¼ in.) mm kg in lb CHV-X 40 (1½ in.) mm kg in lb Valve size C B E G F min H Weight Specified weights are approximate values only. CHV-X Straightway CHV-X 15 (½ in.) mm kg in lb CHV-X 20 (¾ in.) mm kg in lb CHV-X 25 (1 in.) mm kg in lb CHV-X 32 (1¼ in.) mm kg in lb CHV-X 40 (1½ in.) mm kg in lb CHV-X Straightway, Socket weld CHV-X (1¼ - 1½ in.) mm kg in lb 12 DKRCI.PK.000.P H11413

13 Check & stop valve, type SCA-X - Check valve, type CHV-X Dimensions and weights SCA-X/CHV-X (2-2½ in.) B G C Danfoss 148G240_ H E Valve size K C G D H Weight SCA-X SCA-X 50 mm kg SCA-X (2) in lb SCA-X 65 mm kg SCA-X (2½) in lb Valve size C G F min. H Weight CHV-X Angleway CHV-X 50 mm kg CHV-X (2) in lb CHV-X 65 mm kg CHV-X (2½) in lb Valve size C B E G F min. H Weight CHV-X Straightway CHV-X 50 mm kg CHV-X (2) in lb CHV-X 65 mm kg CHV-X (2½) in. 6,4 6,4 1,6 6, lb CHV-X Straightway, Socket weld CHV-X 50 mm kg CHV-X (2) in lb Specified weights are approximate values only. DKRCI.PK.000.P H

14 Check & stop valve, type SCA-X - Check valve, type CHV-X Dimensions and weights SCA-X/CHV-X (3-5 in.) Danfoss M148G0007_1 Danfoss M148G0006_1 B G C Danfoss 148G241_ o H E Valve size K C G D H Weight SCA-X SCA-X 80 mm kg SCA-X (3) in lb SCA-X 100 mm kg SCA-X (4) in lb SCA-X 125 mm kg SCA-X (5) in lb Valve size C G F min. H Weight CHV-X Angleway CHV-X 80 mm kg CHV-X (3) in lb CHV-X 100 mm kg CHV-X (4) in lb CHV-X 125 mm kg CHV-X (5) in lb Valve size C B E G F min. H Weight CHV-X Straightway CHV-X 80 mm kg CHV-X (3) in lb CHV-X 100 mm kg CHV-X (4) in lb CHV-X 125 mm kg CHV-X (5) in lb Specified weights are approximate values only. 14 DKRCI.PK.000.P H11413

15 Check & stop valve, type SCA-X - Check valve, type CHV-X Ordering complete valves How to order The table below is used to identify the valve required. Please note that the type codes only serve to identify the valves, some of wich may not form part of the standard product range. For further information please contact your local Danfoss Sales Company. Valve type (valve size measured on the connection diameter) Connections SCA-X CHV-X Check & stop valve Check Valve Important! Where products need to be certified according to specific certification societies, or where higher pressures are required, the relevant information should be included at the time of order. A D G SOC 15 DN 15 x x x x 20 DN 20 x x x x 25 DN 25 x x x x 32 DN 32 x x x x 40 DN 40 x x x x 50 DN 50 x x x x 65 DN 65 x x 80 DN 80 x x 100 DN 100 x x x 125 DN 125 x x x A D G SOC Valve housing ANG Angle flow STR Straight flow Welding branches: ANSI B 31.5 schedule 80 DN (½ - 1½ in.) Welding branches: ANSI B 31.5 schedule 40 DN (2-5 in.) Welding branches: EN Butt-weld connection: GOST ( and ) Socket weld: ANSI B Angleway SCA-X Butt-weld DIN (EN 10220) Size mm in. Code No. 15 ½ SCA-X 15 D ANG 148B ¾ SCA-X 20 D ANG 148B SCA-X 25 D ANG 148B ¼ SCA-X 32 D ANG 148B ½ SCA-X 40 D ANG 148B SCA-X 50 D ANG 148B ½ SCA-X 65 D ANG 148B SCA-X 80 D ANG 148B SCA-X 100 D ANG 148B SCA-X 125 D ANG 148B6102 SCA-X Butt-weld ANSI (B Schedule 80) Size mm in. Code No. 15 ½ SCA-X 15 A ANG 148B ¾ SCA-X 20 A ANG 148B SCA-X 25 A ANG 148B ¼ SCA-X 32 A ANG 148B ½ SCA-X 40 A ANG 148B5609 SCA-X Butt-weld ANSI (B Schedule 40) Size mm in. Code No SCA-X 50 A ANG 148B ½ SCA-X 65 A ANG 148B SCA-X 80 A ANG 148B SCA-X 100 A ANG 148B SCA-X 125 A ANG 148B6103 Angleway CHV-X Butt-weld DIN (EN 10220) Size mm in. Code No. 15 ½ CHV-X 15 D ANG 148B ¾ CHV-X 20 D ANG 148B CHV-X 25 D ANG 148B ¼ CHV-X 32 D ANG 148B ½ CHV-X 40 D ANG 148B CHV-X 50 D ANG 148B ½ CHV-X 65 D ANG 148B CHV-X 80 D ANG 148B CHV-X 100 D ANG 148B CHV-X 125 D ANG 148B6136 CHV-X Butt-weld ANSI (B Schedule 80) Size mm in. Code No. 15 ½ CHV-X 15 A ANG 148B ¾ CHV-X 20 A ANG 148B CHV-X 25 A ANG 148B ¼ CHV-X 32 A ANG 148B ½ CHV-X 40 A ANG 148B5637 CHV-X Butt-weld ANSI (B Schedule 40) Size mm in. Code No CHV-X 50 A ANG 148B ½ CHV-X 65 A ANG 148B CHV-X 80 A ANG 148B CHV-X 100 A ANG 148B CHV-X 125 A ANG 148B6137 ANG = Angleway SCA-X Socket welding ANSI (B 16.11) CHV-X Socket welding ANSI (B 16.11) Size Size Code No. mm in. mm in. Code No SCA-X 50 SOC ANG 148B ¼ CHV 32 SOC ANG 148B CHV 50 SOC ANG 148B5740 DKRCI.PK.000.P H

16 Check & stop valve, type SCA-X - Check valve, type CHV-X Ordering complete valves (continued) Straightway CHV-X Butt-weld DIN (EN 10220) Size mm in. Code No. 15 ½ CHV-X 15 D STR 148B ¾ CHV-X 20 D STR 148B CHV-X 25 D STR 148B ¼ CHV-X 32 D STR 148B ½ CHV-X 40 D STR 148B CHV-X 50 D STR 148B ½ CHV-X 65 D STR 148B CHV-X 80 D STR 148B CHV-X 100 D STR 148B CHV-X 125 D STR 148B6599 CHV-X Butt-weld ANSI (B Schedule 80) Size mm in. Code No. 15 ½ CHV-X 15 A STR 148B ¾ CHV-X 20 A STR 148B CHV-X 25 A STR 148B ¼ CHV-X 32 A STR 148B ½ CHV-X 40 A STR 148B6590 CHV-X Butt-weld ANSI (B Schedule 40) Size mm in. Code No CHV-X 50 A STR 148B ½ CHV-X 65 A STR 148B CHV-X 80 A STR 148B CHV-X 100 A STR 148B CHV-X 125 A STR 148B6600 STR = Straightway CHV-X Socket welding ANSI (B 16.11) Size mm in. Code No. 15 ½ CHV-X 15 SOC STR 148B ¾ CHV-X 20 SOC STR 148B CHV-X 25 SOC STR 148B ¼ CHV-X 32 SOC STR 148B ½ CHV-X 40 SOC STR 148B CHV-X 50 SOC STR 148B DKRCI.PK.000.P H11413

17 Check & stop valve, type SCA-X - Check valve, type CHV-X Ordering SVA-X from the parts programme Example (select from table 1 and 2) + = Valve housing, size 25 (1 in), DIN butt weld, angleway, 148B5452 Table 1 Top part, SCA-X size 25 (1 in) 148B5482 Table 2 Table 1 SVL valve housings w/different connections DN mm ( in) DN mm (3 5 in) Sizes [DN] Valve Housing SVL DIN-Butt weld ANSI-Butt weld GOST-Butt-weld SOC FPT T [mm] [in] ANG STR ANG STR ANG STR ANG STR ANG STR ANG B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B6134 Table 2 SCA-X complete top part including gaskets and bolts SCA-X SCA-X Sizes [DN] Complete top part [mm] [in] SCA-X B B B B B B B6118 DKRCI.PK.000.P H

18 Check & stop valve, type SCA-X - Check valve, type CHV-X Ordering CHV-X from the parts programme Example (select from table 1 and 2) + = Valve housing, size 25 (1 in), DIN butt weld, angleway, 148B5452 Table 1 Top part, CHV-X size 25 (1 in) 148B5483 Table 2 Table 1 SVL valve housings w/different connections DN mm ( in) DN mm (3 5 in) Sizes [DN] Valve Housing SVL DIN-Butt weld ANSI-Butt weld GOST-Butt-weld SOC FPT T [mm] [in] ANG STR ANG STR ANG STR ANG STR ANG STR ANG B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B6134 Table 2 CHV-X complete top part including gaskets and bolts CHV-X CHV-X Sizes [DN] Complete top part [mm] [in] CHV-X B B B B B B B DKRCI.PK.000.P H11413

19 Shut-off Check & and stop regulating valves, type valves SCA-X SS for Check Industrial valves, Refrigeration type CHV-X SS Contents Page Features Pressure and temperature range Design Technical data Connections Material specification Dimensions and weights Ordering complete valves DKRCI.PD.FL0.B DKRCI.PK.000.P H

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21 Shut-off Check & and stop regulating valves, type valves SCA-X SS for Check Industrial valves, Refrigeration type CHV-X SS In certain specific areas such as outdoor applications and corrosive atmospheres, such as coastal installations, there is a need for high surface protection to prevent failure due to corrosion. Today's food safety standards often call for daily treatment with detergents to protect against bacteria growth, again producing a need for high surface protection. SCA-X SS are check valves with a built-in stop valve function. CHV-X SS are check valves only. The valves are designed to open at very low differential pressures, allow favourable flow conditions and are easy to disassemble for inspection and service. The valve cone has a built-in flexibility to ensure a precise and tight closing towards the valve seat. A well balanced dampening effect between the piston and the cylinder gives an optimal protection during low loads and against pulsations. Features Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO 2), Propane, Butane, Iso-Butane and Ethane. Designed to give favourable flow conditions. Internal backseating enables replacement of the spindle seal whilst the valve is active, i.e. under pressure (SCA-SS) Housing is made of special cold resistant stainless steel approved for low temperature operations. Easy to disassemble for inspection and service. Butt-weld DIN and ANSI connections. Max. operating pressure: 52 bar g (754 psig) Temperature range: 60/+150 C ( F). Compact and light valves for easy handling and installation. Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company. Pressure and temperature range Pressure psi bar C F Temperature SCA-X SS/CHV-X SS DN15-DN40 DKRCI.PK.000.P H

22 Check & stop valves in stainless steel, type SCA-X SS - Check valves in stainless steel, type CHV-X SS Design Connections Available with the following connections: Butt-weld DIN (EN 10220) DN (½ - 1½ in.) Butt-weld ANSI (B 36.19M) DN (¾ - 1½ in.) Housing Made of stainless steel approved for low temperature operations. Valve cone Valve cone with built in metallic stop - prevents damage to teflon ring in case of overtightening. Damping chamber The chamber is filled with refrigerants (gas or liquid), which provides a damping effect when the valve opens and closes. Spindle (SCA-X SS) Made of polished stainless steel, which is ideal for O-ring sealing. Packing Gland (SCA-X SS) The full temperature range packing gland is the standard for the entire SVL platform. This ensures perfect tightness throughout the whole temperature range: 60/+150 C ( 76/+302 F). Pressure Equipment Directive (PED) The SCA-X SS/CHV-X SS valves are approved according to the European standard specified in the Pressure Equipment Directive and are CE marked. For further details / restrictions - see the product instruction. Installation The valve must be mounted vertically with the cone downwards. The valve is designed to resist very high internal pressure. However, the piping system in general should be designed to avoid liquid traps and reduce the risk of hydraulic pressure caused by thermal expansion. For further information refer to installation instructions for SCA-X SS/CHV-X SS. If cold refrigeration oil having low viscosity enters and settles in the damping chamber, problems with the check valve may arise. Consequently, it may be necessary to modify the valve for more viscous liquids by enlarging the hole to the damping chamber. Example of marking ring, CHV-X SS DN15/½ CHECK VALVE CHV-X SS SCA-X SS/CHV-X SS valves Nominal bore DN = < 25 mm (1 in.) DN32-40 mm (1¼ - 1½ in.) Classified for Fluid group I Category Article 3, paragraph 3 II Technical data Refrigerants Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO 2), Propane, Butane, Iso-Butane and Ethane. For further information refer to the product instruction for SCA-X SS/CHV-X SS. Temperature range 60/+150 C ( 76/+302 F). Max. working pressure 52 bar g (754 psig). 22 DKRCI.PK.000.P H11413

23 Check & stop valves in stainless steel, type SCA-X SS - Check valves in stainless steel, type CHV-X SS Connections DIN ANSI Size OD T Butt-weld DIN (EN 10220) 15 mm ½ in mm ¾ in mm in mm ¼ in mm ½ in Size OD T Butt-weld ANSI (B 36.19M, SCHEDULE 40) 20 mm ¾ in mm in mm ¼ in mm ½ in DKRCI.PK.000.P H

24 Check & stop valves in stainless steel, type SCA-X SS - Check valves in stainless steel, type CHV-X SS Material specification Danfoss M148G0008_ Danfoss M148G0009_ Danfoss 148G237_ SCA-X SS CHV-X SS CHV-X SS No. Part Material DIN/EN ISO ASTM 1 Housing Stainless steel GX5CrNi19-10 EN Bonnet, Flange Stainless steel X5CrNi18-10 EN Bonnet, Insert Stainless steel X8CrNiS18-9 DIN Spindle Stainless steel X8CrNiS18-9 DIN Cone Steel Teflon (PTFE) 6 O-ring Cloroprene (Neoprene) 7 Spindle extension Steel 8 Packing gland O-rings 9 Packing washer Aluminium Stainless steel Cloroprene (Neoprene) 10 Spring loaded seal Teflon (PTFE) 11 O-ring Cloroprene (Neoprene) AISI 304 AISI , AISI Bolts Stainless steel A2-70 A Gasket Fiber, non-asbestos 14 Spring Steel 15 Identification ring Stainless steel 16 Seal cap gasket Nylon 17 Spindle seal cap Aluminium 24 DKRCI.PK.000.P H11413

25 Check & stop valves in stainless steel, type SCA-X SS - Check valves in stainless steel, type CHV-X SS Dimensions and weights SCA-X SS/CHV-X SS (½- 1½ in.) G B C H E DANFOSS 148G238_ SCA-X SS CHV-X SS Valve size C G D F min H Weight SCA-X SS SCA-X SS 15 (½ in.) SCA-X SS 20 (¾ in.) SCA-X SS 25 (1 in.) SCA-X SS 32 (1¼ in.) SCA-X SS 40 (1½ in.) mm kg in lb mm kg in lb mm kg in lb mm kg in lb mm kg in lb CHV-X SS Angleway CHV-X SS 15 (½ in.) mm kg in lb CHV-X SS 20 (¾ in.) mm kg in lb CHV-X SS 25 (1 in.) mm kg in lb CHV-X SS 32 (1¼ in.) mm kg in lb CHV-X SS 40 (1½ in.) mm kg in lb Valve size C B E G F min H Weight Specified weights are approximate values only. CHV-X SS Straightway CHV-X SS 15 (½ in.) mm kg in lb CHV-X SS 20 (¾ in.) mm kg in lb CHV-X SS 25 (1 in.) mm kg in lb CHV-X SS 32 (1¼ in.) mm kg in lb CHV-X SS 40 (1½ in.) mm kg in lb DKRCI.PK.000.P H

26 Check & stop valves in stainless steel, type SCA-X SS - Check valves in stainless steel, type CHV-X SS Ordering complete valves How to order The table below is used to identify the valve required. Please note that the type codes only serve to identify the valves, some of wich may not form part of the standard product range. For further information please contact your local Danfoss Sales Company. Valve type (valve size measured on the connection diameter) Connections SCA-X SS CHV-X SS Stop Check Valve Check Valve 15 DN 15 x 20 DN 20 x x 25 DN 25 x x 32 DN 32 x x 40 DN 40 x x Important! Where products need to be certified according to specific certification societies, or where higher pressures are required, the relevant information should be included at the time of order. D A Valve housing ANG Angle flow STR Butt-weld connection: DIN EN Butt-weld connection: ANSI B 36.19M Straight flow D A SCA-X SS Angleway Butt-weld DIN (EN 10220) Size mm in. Code No. 15 ½ SCA-X SS 15 D ANG 148B ¾ SCA-X SS 20 D ANG 148B SCA-X SS 25 D ANG 148B ¼ SCA-X SS 32 D ANG 148B ½ SCA-X SS 40 D ANG 148B5664 Butt-weld ANSI (B 36.19M SCHEDULE 40) Size mm in. Code No. 20 ¾ SCA-X SS 20 A40 ANG 148B SCA-X SS 25 A40 ANG 148B ¼ SCA-X SS 32 A40 ANG 148B ½ SCA-X SS 40 A40 ANG 148B5687 CHV-X SS Angleway Butt-weld DIN (EN 10220) Size mm in. Code No. 15 ½ CHV-X SS 15 D ANG 148B ¾ CHV-X SS 20 D ANG 148B CHV-X SS 25 D ANG 148B ¼ CHV-X SS 32 D ANG 148B ½ CHV-X SS 40 D ANG 148B5665 CHV-X SS Straightway Butt-weld DIN (EN 10220) Size mm in. Code No. 15 ½ CHV-X SS 15 D STR 148B ¾ CHV-X SS 20 D STR 148B CHV-X SS 25 D STR 148B ¼ CHV-X SS 32 D STR 148B ½ CHV-X SS 40 D STR 148B6566 ANG = Angleway STR = Straightway Butt-weld ANSI (B 36.19M SCHEDULE 40) Size mm in. Code No. 20 ¾ CHV-X SS 20 A40 ANG 148B CHV-X SS 25 A40 ANG 148B ¼ CHV-X SS 32 A40 ANG 148B ½ CHV-X SS 40 A40 ANG 148B5688 Butt-weld ANSI (B 36.19M SCHEDULE 40) Size mm in. Code No. 20 ¾ CHV-X SS 20 A40 STR 148B CHV-X SS 25 A40 STR 148B ¼ CHV-X SS 32 A40 STR 148B ½ CHV-X SS 40 A40 STR 148B DKRCI.PK.000.P H11413

27 Shut-off Check valves and regulating valves for Industrial NRVA Refrigeration Contents Page Features Design Technical data Material specification Ordering Flange connections Dimensions and weights Nominal capacities DKRCI.PD.FK0.A DKRCI.PK.000.P H

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29 Shut-off Check valves and regulating valves for Industrial NRVA Refrigeration Check valve type NRVA can be used in liquid, suction and hot gas lines in refrigeration and air conditioning plant with ammonia. NRVA can also be used in refrigerating systems with fluorinated refrigerants. When the NRVA is used in liquid lines where cold, thick oil or impurities may be present, it is recommended that the standard spring be replaced by a special spring. See ordering table. Features Ensures correct direction of flow. Valve housing made of steel. Available for 40 bar g / 580 psig working pressure. Large range of flanges with connection dimensions in accordance with standards: DIN, ANSI, SOC, SA and FPT. Fitted with damping piston that makes the valves suitable for installation in lines where pulsation can occur, e.g. in the discharge line from the compressor. Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company. Design Connections There is a very wide range of connection possibilities with NRVA check valves: Welding, DIN (2448) Welding, ANSI (B 36.10) Welding socket, ANSI (B 16.11) Solder connection, DIN (2856) Solder connection, ANSI (B 16.22) FPT internal thread, NPT (ANSI/ASME B ) Gaskets: Do not contain asbestos. Valve cone: The valve cone has a teflon tightening ring. Teflon tightening ring renders perfect sealing at a minimum closing force. DKRCI.PK.000.P H

30 Check valves, type NRVA Technical data Material specification Refrigerants Applicable to HCFC, HFC and R717 (Ammonia). For further information please see installation instruction for NRVA. Use with flammable hydrocarbons cannot be recommended; please contact Danfoss. Temperature range C / F. Pressure range The valve is designed for: Max. working pressure: 40 bar g / 580 psig. Material specification for NRVA check valves No. Part Material DIN ISO ASTM 1 Housing Steel G20Mn5QT *) EN P285QH EN LCC, A LF2,A350 2 Flanges Steel RSt. 37-2, Fe360 B, 630 Grade C, A Valve cone Stainless steel Teflon 5 Spring Steel 9 Bolts Stainless steel A Nut Stainless steel 11 Gasket Non asbestos 12 Valve seat Steel *) NRVA 40 / NRVA 50 housing material is TTSt 35N until January 2006 Ordering Complete valves incl. DIN 2448 flange: Code no. Dp 2 ) Weld flange kv value connection With With 3 ) Cv value 4 ) Valve Spec. spring 1 ) standard spring spec. spring 1 ) [in] [bar[ [psig] [bar] [psig] [m 3 /h] [gal/min] NRVA NRVA NRVA NRVA NRVA NRVA NRVA ) A special type spring can be supplied to replace the standard valve spring. 2 ) p = the minimum pressure differential at which the valve is completely open. 3 ) The kv value is the flow of water in m 3 /h at a pressure drop across valve of 1 bar, ρ = 1000 kg/m 3. 4 ) The Cv value is the flow of water in gal/min at a pressure drop across valve of 1 psig, ρ = 10 lbs/gal. Valve body without flanges: Code no. NRVA NRVA NRVA NRVA NRVA NRVA NRVA Staybolts and gaskets Dimensions Code no. NRVA 15 / 20 M mm NRVA 25 / 32 M mm NRVA 40 / 50 M mm NRVA 65 M mm DKRCI.PK.000.P H11413

31 Check valves, type NRVA Flange connections Danfoss flange sets excluding gaskets, bolts and nuts, are specially made for the Danfoss product range and must only be used for the purpose described. Select the valve based on capacity and then select the size of flanges most suitable for the application, which can be mounted on the valve. Size [mm] Size [in] OD [mm] T [mm] OD [in] T [in] Flange type For use with valve housing size Code no. DIN Butt welding DIN (2448) NRVA 15/20 027N NRVA 15/20 027N NRVA 15/20 027N NRVA 25/32 027N NRVA 25/32 027N NRVA 40/50 027N NRVA 40/50 027N NRVA N1055 Size [mm] Size [in] OD [mm] T [mm] OD [in] T [in] Flange type For use with valve housing size Code no. ANSI Butt welding ANSI B NRVA 15/20 027N NRVA 15/20 027N NRVA 15/20 027N NRVA 25/32 027N NRVA 25/32 027N NRVA 40/50 027N NRVA 40/50 027N NRVA N2027 Size [mm] Size [in] ID [mm] T [mm] ID [in] T [in] L [mm] L [in] Flange type For use with valve housing size Code no. SOC Socket welding ANSI (B 16.11) NRVA 15/20 027N NRVA 15/20 027N NRVA 25/32 027N NRVA 25/32 027N NRVA 25/32 027N NRVA 40/50 027N2015 Size [mm] Size [in] ID [mm] ID [in] L [mm] L [in] Flange type For use with valve housing size Code no. SA Soldering DIN (2856) NRVA 15/20 027L NRVA 15/20 027L NRVA 25/32 027L NRVA 40/50 027L2554 Soldering (ANSI B 16.22) NRVA 15/20 027L NRVA 15/20 027L NRVA 25/32 027L NRVA 40/50 027L2554 To be continued next page. DKRCI.PK.000.P H

32 Check valves, type NRVA Flange connections (Continued) FPT Size [mm] Size [in] Inside pipe thread Flange type For use with valve housing size Code no. FPT inside pipe thread, NPT (ANSI/ASME B ) ( NPT) 1.3 NRVA 15/20 027G ( NPT) 1.3 NRVA 15/20 027G ( NPT) 4 NRVA 25/32 027G1007 Example NRVA 32 with 1 1 4" flanges for ANSI butt welding: NRVA 32 + bolts + flanges (set) = N2024 NOTE: The flanges sets are exclusive gaskets, bolts and nuts. Dimensions and weights L L1 1 ) B Weight NRVA NRVA NRVA NRVA 65 1 ) Without flanges [mm] [in] [mm] [in] [mm] [in] [mm] [in] kg lb kg lb kg lb kg lb 32 DKRCI.PK.000.P H11413

33 Check valves, type NRVA Nominal capacities Liquid line with/without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line Pump Wet suction line Dry suction line Discharge line Liquid line without phase change Liquid line with or without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line Gravity Wet suction line Dry suction line Discharge line Liquid line without phase change Liquid line with or without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line DX Dry suction line Discharge line Liquid line without phase change DKRCI.PK.000.P H

34 Check valves, type NRVA Nominal capacities Liquid line with / without phase change SI units Calculation example (R 134a capacities): Running conditions in a plant are as follows: T e = 20 C Q 0 = 300 kw T liq = 10 C Max. P = 0.3 bar The capacity table is based on nominal conditions ( P = 0.2 bar, T liq = 30 C). The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. for P 0.3 bar f P = for liquid temperature f Tliq = Q n = Q o f P f Tliq = = 202 kw. From the capacity table a NRVA 25 with Qn = 370 kw is the correct selection for the application. US units Calculation example (R 134a capacities): Running conditions in a plant are as follows: T e = -20 F Q o = 130 TR T liq = 50 F Max. P = 5 psi The capacity table is based on nominal conditions ( P = 3 psi, T liq = 90 F) The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. for P 5 psi, f P = 0.79 for liquid temperature f Tliq = Q n = Q o f P f Tliq = = 83.2 TR From the capacity table a NRVA 25 with Qn = 100 TR is the correct selection for the application. 34 DKRCI.PK.000.P H11413

35 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P = 0.2 bar R 717 kv [m 3 /h] Liquid line with/without phase change -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.09 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi R 717 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F 1.09 DKRCI.PK.000.P H

36 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P = 0.2 bar R 22 kv [m 3 /h] Liquid line with / without phase change -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.22 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi R 22 Cv [USgal/min] * 2 F below min. operating temperature. Evaporating temperature T e -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F DKRCI.PK.000.P H11413

37 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P = 0.2 bar R 134a kv [m 3 /h] Liquid line with/without phase change -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.29 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi R 134a Cv [USgal/min] * 2 F below min. operating temperature. Evaporating temperature T e -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F 1.35 DKRCI.PK.000.P H

38 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P = 0.2 bar R 404A kv [m 3 /h] Liquid line with/without phase change -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.68 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi R 404A Cv [USgal/min] * 2 F below min. operating temperature. Evaporating temperature T e -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F DKRCI.PK.000.P H11413

39 Check valves, type NRVA Nominal capacities Liquid line without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line Pump Wet suction line Dry suction line Discharge line Liquid line without phase change Liquid line with or without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line DX Dry suction line Discharge line Liquid line without phase change DKRCI.PK.000.P H

40 Check valves, type NRVA Nominal capacities Liquid line without phase change SI units Calculation example (R 134a capacities): Running conditions in a plant are as follows: T e = -20 C Q 0 = 300 kw circulation rate = 3 Max. P = 0.3 bar The capacity table is based on nominal conditions (pressure drop P = 0.2 bar, circulation rate = 4). The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. for P 0.3 bar f P = 0.82 for circulation rate f rec = Q n = Q 0 f p f rec = = kw From the capacity table a NRVA 40 with Q n = 336 kw is the correct selection for the application. US units Calculation example (R 134a capacities): Running conditions in a plant are as follows: T e = -20 F Q 0 = 130 TR Circulation rate = 3 Max. P = 5 psi The capacity table is based on nominal conditions (pressure drop p = 3 psi, circulation rate = 4). The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. for P 5 psi f p = 0.79 for circulation rate f rec = Q n = Q 0 x f P x f circ = = 77.0 TR From the capacity table a NRVA 40 with Q n = 101 TR is the correct selection for the application. 40 DKRCI.PK.000.P H11413

41 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], circulation rate = 4, P = 0.2 bar R 717 kv [m 3 /h] Liquid line without phase change -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for circulation rate (f rec) Circulation rate US units conditions, Q N [Tons of Refrigeration], circulation rate = 4, P = 3 psi R 717 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for circulation rate (f rec) Circulation rate DKRCI.PK.000.P H

42 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], circulation rate = 4, P = 0.2 bar R 22 kv [m 3 /h] Liquid line without phase change -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for circulation rate (f rec) Circulation rate US units conditions, Q N [Tons of Refrigeration], circulation rate = 4, P = 3 psi R 22 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for circulation rate (f rec) Circulation rate DKRCI.PK.000.P H11413

43 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], circulation rate = 4, P = 0.2 bar R 134a kv [m 3 /h] Liquid line without phase change -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for circulation rate (f rec) Circulation rate US units conditions, Q N [Tons of Refrigeration], circulation rate = 4, P = 3 psi R 134a Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for circulation rate (f rec) Circulation rate DKRCI.PK.000.P H

44 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], circulation rate = 4, P = 0.2 bar R 404A kv [m 3 /h] Liquid line without phase change -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for circulation rate (f rec) Circulation rate US units conditions, Q N [Tons of Refrigeration], circulation rate = 4, P = 3 psi R 404A Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for circulation rate (f rec) Circulation rate DKRCI.PK.000.P H11413

45 Check valves, type NRVA Nominal capacities Wet suction line Location of valve in system (marked with grey) Hot gas bypass & defrost line Pump Wet suction line Dry suction line Discharge line Liquid line without phase change Liquid line with or without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line Gravity Wet suction line Dry suction line Discharge line Liquid line without phase change Liquid line with or without phase change DKRCI.PK.000.P H

46 Check valves, type NRVA Nominal capacities SI units Calculation example (R 717 capacities): Running conditions in a plant are as follows: Te = -20 C Q 0 = 100 kw Circulation rate = 3 Max. P = 0.3 bar The capacity table is based on nominal conditions (pressure drop P = 0.2 bar, circulation rate = 4). The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. Wet suction line for P 0.3 bar f P = 0.82 for circulation rate f rec = 0.9. Q n = Q 0 f P f rec = = 73,8 kw. From the capacity table a NRVA 40 with Q n = 157 kw is the correct selection for the application. Choosing NRVA 32 would give a slightly higher pressure drop than 0.3. Accepting this requires a plant evaluation. US units Calculation example (R 717 capacities): Running conditions in a plant are as follows: T e = - 20 F Q 0 = 10 TR Circulation rate = 3 Max. P = 5 psi The capacity table is based on nominal conditions (pressure drop P = 3 psi, circulation rate = 4). The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. for P 5 psi f p = 0.79 for circulation rate f rec = 0.9. Q n = Q 0 f P f circ = = 7.1 TR From the capacity table a NRVA 25 with Q n = 16.5 TR is the correct selection for the application. 46 DKRCI.PK.000.P H11413

47 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], circulation rate = 4, P = 0.2 bar R 717 kv [m 3 /h] Wet suction line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for circulation rate (f rec) Circulation rate US units conditions, Q N [Tons of Refrigeration], circulation rate = 4, P = 3 psi R 717 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for circulation rate (f rec) Circulation rate DKRCI.PK.000.P H

48 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], circulation rate = 4, P = 0.2 bar R 22 kv [m 3 /h] Wet suction line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for circulation rate (f rec) Circulation rate US units conditions, Q N [Tons of Refrigeration], circulation rate = 4, P = 3 psi R 22 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for circulation rate (f rec) Circulation rate DKRCI.PK.000.P H11413

49 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], circulation rate = 4, P = 0.2 bar R 134a kv [m 3 /h] Wet suction line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for circulation rate (f rec) Circulation rate US units conditions, Q N [Tons of Refrigeration], circulation rate = 4, P = 3 psi R 134a Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for circulation rate (f rec) Circulation rate DKRCI.PK.000.P H

50 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], circulation rate = 4, P = 0.2 bar R 404A kv [m 3 /h] Wet suction line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for circulation rate (f rec) Circulation rate US units conditions, Q N [Tons of Refrigeration], circulation rate = 4, P = 3 psi R 404A Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for circulation rate (f rec) Circulation rate DKRCI.PK.000.P H11413

51 Check valves, type NRVA Nominal capacities Dry suction line Location of valve in system (marked with grey) Hot gas bypass & defrost line Pump Wet suction line Dry suction line Discharge line Liquid line without phase change Liquid line with or without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line Gravity Discharge line Wet suction line Liquid line without phase change Liquid line with or without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line DX Dry suction line Discharge line Liquid line with or without phase change DKRCI.PK.000.P H

52 Check valves, type NRVA Nominal capacities SI units Calculation example (R 134a capacities): Running conditions in a plant are as follows: T e = -20 C Q 0 = 90 kw T liq = 10 C T s = 6 C Max. P = 0.3 bar The capacity table is based on nominal conditions (pressure drop P = 0.2 bar, T liq = 30 C), T s = 10 C The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. Dry suction line for P 0.3 bar f P = 0.82 for liquid temperature f Tliq = 0.82 for superheat (T S) = 1,0 Q n = Q 0 f P f Tliq f Ts = = 60.5 kw From the capacity table a NRVA 40 or NRVA 50 with Q n = 65 kw is the correct selection depending on connections for the application. US units Calculation example (R 134a capacities): Running conditions in a plant are as follows: T e = 0 F Q 0 = 23 TR T liq = 50 F T s = 10 F Max. P = 5 psi The capacity table is based on nominal conditions (pressure drop P = 3 psi, T liq = 90 F), T s = 14 F The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. for P 5 psi f p = 0.79 for liquid temperature f Tliq = 0.81 for superheat (T S) = 1,0 Q n = Q 0 f P f Tliq f Ts = 23 x 0.79 x 0.81 x 1.0 = 14.7 TR From the capacity table a NRVA 40 or NRVA 50 with Q n = 19.3 TR is the correct selection depending on connections for the application. 52 DKRCI.PK.000.P H11413

53 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P = 0.2 bar R 717 kv [m 3 /h] Dry suction line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for superheat (T S) Τs 6 C C C C 1.00 for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.09 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi R 717 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for superheat (T S) Τs 10 F F F F 1.00 for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F 1.09 DKRCI.PK.000.P H

54 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P = 0.2 bar R 22 kv [m 3 /h] Dry suction line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for superheat (T S) Τs 6 C C C C 1.00 for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.22 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi R 22 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for superheat (T S) Τs 10 F F F F 1.00 for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F DKRCI.PK.000.P H11413

55 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P = 0.2 bar R 134a kv [m 3 /h] Dry suction line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for superheat (T S) Τs 6 C C C C 1.00 for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.29 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi R 134a Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for superheat (T S) Τs 10 F F F F 1.00 for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F 1.35 DKRCI.PK.000.P H

56 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P = 0.2 bar R 404A kv [m 3 /h] Dry suction line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (bar) for superheat (T S) Τs 6 C C C C 1.00 for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.68 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi R 404A Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for superheat (T S) Τs 10 F F F F 1.00 for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F DKRCI.PK.000.P H11413

57 Check valves, type NRVA Nominal capacities Discharge line Location of valve in system (marked with grey) Hot gas bypass & defrost line Pump Wet suction line Dry suction line Discharge line Liquid line without phase change Liquid line with or without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line Gravity Wet suction line Dry suction line Discharge line Liquid line without phase change Liquid line with or without phase change Location of valve in system (marked with grey) Hot gas bypass & defrost line DX Dry suction line Discharge line Liquid line with or without phase change DKRCI.PK.000.P H

58 Check valves, type NRVA Nominal capacities SI units Calculation example (R 717 capacities): Running conditions in a plant are as follows: T e = -20 C Q o = 90 kw T liq = 10 C Max. P = 0.4 bar T disch = 60 C The capacity table is based on nominel conditions ( P = 0.2 bar, T liq = 30 C, P disch= 12 bar, T disch = 80 C). The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. Discharge line for P 0.4 bar f P = for liquid temperature f = Tliq for T disch 60 C, fdisch = for P disch 12 bar, fpdisch = 1.0. Q n = Q o f P f Tliq f Tdisch f Pdisch = = 58 kw. From the capacity table a NRVA 20 with Q n = 67.5 kw is the correct selection for the application. US units Calculation example (R 717 capacities): Running conditions in a plant are as follows: T e = 0 F Q o = 18 TR T liq = 50 F Max. P = 7 psi T disch = 120 F The capacity table is based on nominel conditions ( P = 3 psi, T liq = 90 F, P disch= 185 psi, T disch = 180 F). The actual capacity must therefore be corrected to a nominal condition by multiplication with correction factors. for P 7 psi f P = for liquid temperature f Tliq = for T disch 120 F, fdisch = for P disch 185 psi, f = 1.0. pdisch Q n = Q o f P f Tliq f circ f Pdisch = = 10.5 TR From the capacity table a NRVA 15 with Q n= 16.4 TR is the correct selection for the application. 58 DKRCI.PK.000.P H11413

59 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P disch. = 12 bar, P = 0.2 bar, T disch. = 80 C R 717 kv [m 3 /h] Discharge line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for discharge pressure (P disch) Pdisch (bar) for P (f P) P (bar) for discharge temperature (T disch) Discharge temperature 50 C C C C C C C 1.06 for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.09 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi, P disch. = 185 psi, T disch. = 180 F R 717 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for P (f P) P (psi) for discharge temperature (T disch) Discharge temperature for liquid temperature (T liq) Liquid temperature -10 F 0.82 for discharge pressure (P disch) Pdisch (psi) F F F F F F F F F F F F F F 1.09 DKRCI.PK.000.P H

60 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P disch. = 12 bar, P = 0.2 bar, T disch. = 80 C R 22 kv [m 3 /h] Discharge line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for discharge pressure (P disch) Pdisch (bar) for P (f P) P (bar) for discharge temperature (T disch) Discharge temperature 50 C C C C C C C 1.06 for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.22 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi, P disch. = 185 psi, T disch. = 180 F R 22 Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for discharge pressure (P disch) Pdisch (psi) for P (f P) P (psi) for discharge temperature (T disch) Discharge temperature 120 F F F F F F F 1.06 for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F DKRCI.PK.000.P H11413

61 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P disch. = 12 bar, P = 0.2 bar, T disch. = 80 C R 134a kv [m 3 /h] Discharge line -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for discharge pressure (P disch) Pdisch (bar) for P (f P) P (bar) for discharge temperature (T disch) Discharge temperature 50 C C C C C C C 1.06 for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.29 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi, P disch. = 185 psi, T disch. = 180 F R 134a Cv [USgal/min] * 2 F below min. operating temperature. -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for discharge pressure (P disch) Pdisch (psi) for P (f P) P (psi) for discharge temperature (T disch) Discharge temperature 120 F F F F F F F 1.05 for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F 1.35 DKRCI.PK.000.P H

62 Check valves, type NRVA Nominal capacities SI units conditions, Q N [kw], T liq = 30 C, P disch. = 12 bar, P = 0.2 bar, T disch. = 80 C R 404A kv [m 3 /h] Discharge line -50 C -40 C -30 C -20 C -10 C 0 C 10 C 20 C NRVA NRVA NRVA NRVA NRVA NRVA NRVA for discharge pressure (P disch) Pdisch (bar) for P (f P) P (bar) for discharge temperature (T disch) Discharge temperature 50 C C C C C C C 1.06 for liquid temperature (T liq) Liquid temperature -20 C C C C C C C C 1.68 US units conditions, Q N [Tons of Refrigeration], T liq = 90 F, P = 3 psi, P disch. = 185 psi, T disch. = 180 F R 404A Cv [USgal/min] * 2 F below min. operating temperature. -60 F* -40 F -20 F 0 F 20 F 40 F 60 F 80 F NRVA NRVA NRVA NRVA NRVA NRVA NRVA for discharge pressure (P disch) Pdisch (psi) for P (f P) P (psi) for discharge temperature (T disch) Discharge temperature 120 F F F F F F F 1.05 for liquid temperature (T liq) Liquid temperature -10 F F F F F F F F DKRCI.PK.000.P H11413

63 Shut-off Check valve and regulating valves for Industrial NRVS Refrigeration Contents Page Features Technical data Materials Capacities Ordering Dimensions and weights DKRCI.PD.FI0.A DKRCI.PK.000.P H

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65 Shut-off Check valve and regulating valves for Industrial NRVS Refrigeration Check valve type NRVS has no damping feature and therefore can only be used for liquid line applications. NRVS is designed to be mounted directly to PM or solenoid valves EVRA / EVRAT. Features Ensures correct direction of flow Applicable to HCFC, HFC and R717 (Ammonia) Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company Technical data Temperature of medium: -50 C 140 C Maximum working pressure: PS = 28 bar / 406 psig Materials Valve housing made of Stainless Steel Gaskets are non-asbestos DKRCI.PK.000.P H

66 Check valve, type NRVS Capacities Location of valve in system (marked with grey) Hot gas by-pass & defrost line Low pressure liquid line Dry suction line Wet suction line Discharge line NRVS Liquid line without phase change Liquid line with or without phase change Valve combination EVRA/EVRAT 10 + NRVS 15 EVRA/EVRAT 15 + NRVS 15 EVRA/EVRAT 20 + NRVS 25 EVRA + NRVS 25 kv [m 3 /h] Evaporating temperature Te -40 C -30 C -20 C -10 C Pressure p [bar] Capacities (kw) Q0 at circulation rate 1 R Note: The capacities in the table must be divided by the actual circulation rate, or the evaporator capacities must be multiplied with the actual circulation rate. Solution = 1160 kw EVRAT 25 + NRVS 25: Q 0 = 1180 kw, at p = 0.3 bar is chosen. Minimum opening differential pressure: EVRA/EVRAT NRVS EVRA/EVRAT 25 + NRVS 0.07 bar 0.11 bar Precise valve capacities can be calculated for various refrigerants by using the DIRcalc (Danfoss Industrial Refrigeration calculation programme). Example An application has the following operating conditions: Refrigerant:...R717 Evaporating temperature: C Evaporator capacity (Q 0 ): kw Circulation rate:... 4 p 0.3 bar 66 DKRCI.PK.000.P H11413

67 Check valve, type NRVS Capacities (continued) Location of valve in system (marked with grey) Low pressure liquid line Hot gas by-pass & defrost line Wet suction line Dry suction line Discharge line NRVS Liquid line without phase change Liquid line with or without phase change PM 15 PM 20 PM 25 Valve combination NRVS 25 NRVS 25 NRVS 25 kv [m 3 /h] Evaporating temperature T e -50 C -40 C -30 C -20 C -10 C Pressure p (bar) Capacities (kw) Q 0 at circulation rate 1 R Note: The capacities in the table must be divided by the actual circulation rate, or the evaporator capacities must be multiplied with the actual circulation rate. Minimum opening differential pressure: PM + NRVS will be fully open at p = 0.25 bar. Precise valve capacities can be calculated for various refrigerants by using the DIRcalc (Danfoss Industrial Refrigeration calculation programme). DKRCI.PK.000.P H

68 Ordering Check valve Flanges, gasket and bolts 1 ) Valve type Code. no. For valve type Code no. Weight 2 ) [kg] Flange type Connection size NRVS EVRA / T 10, EVRA / T N in NRVS EVRA / T 20, EVRA / T 25, PM 15, PM 20, PM N in Flanges,gaskets and bolts for NRVS stand alone 3) Code no. Weight 2 ) [kg] Flange type Connection size 027N in 027N in 1) Consists of one standard and one special flange, one gasket and 2 bolts. 2) Flange and bolts only. 3) Consist of flanges, gaskets, bolts and nuts only. One standard flange and one special flange, two gasket, 2 bolts and 2 nuts. Dimensions and weights NRVS on valve NRVS stand alone L [mm] B [mm] Weight 1 ) kg NRVS NRVS ) NRVS without flanges and bolts L [mm] B [mm] Weight 1 ) kg NRVS NRVS ) NRVS without flanges and bolts 68 DKRCI.PK.000.P H11413