Solenoid valves Type EVR 2 40 NC/ NO REFRIGERATION AND AIR CONDITIONING. Technical leaflet
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1 Solenoid valves EVR 2 40 NC/ NO REFRIGERATION AND AIR CONDITIONING Technical leaflet
2 2 DKRCCPDBB0A H275 Danfoss A/S,
3 Contents Page Introduction Features Approvals Technical data Ordering Liquid capacity Q o kw, R22/ R4a/R404A/R Liquid capacity Q o kw, R407C Suction vapour capacity Q o kw, R Suction vapour capacity Q o kw, R4a/R404A/R Suction vapour capacity Q o kw, R407C Hot gas capacity Q h kw, R Hot gas capacity Q h kw, R4a Hot gas capacity Q h kw, R404A/R Hot gas capacity Q h kw, R407C Hot gas capacity G h kg/s, R22/R4a Hot gas capacity G h kg/s, R404A/R507/R407C Design/ Function Material specification Dimensions and weight, EVR (NC) 2 5 and -> 5 (NO) with fl are connection Dimensions and weight, EVR (NC) 2 22 and -> 22 (NO) with solder connection Dimensions and weight, EVR (NC) 25, 2 og 40 with solder connection Danfoss A/S, DKRCCPDBB0A H275
4 Introduction EVR is a direct or servo operated solenoid valve for liquid, suction, and hot gas lines with fluorinated refrigerants. EVR valves are supplied complete or as separate components, i.e. valve body, coil and flanges, if required, can be ordered separately. Features Approvals Technical data Complete range of solenoid valves for refrigeration, freezing and air conditioning plant Supplied both normally closed (NC) and normally open (NO) with de-energized coil Wide choice of coils for a.c. and d.c. Suitable for all fluorinated refrigerants Designed for media temperatures up to 05 C DnV, Det norske Veritas, Norge Pressure Equipment Directive (PED) 97/2/EC The Low Voltage Directive (LVD) 7/2/EC with amendments EN Refrigerants CFC, HCFC, HFC Temperature of medium C with 0 W or 2 W coil. Max. 0 C during defrosting. MOPD up to 25 bar with 2 W coil Flare connections up to 5/8 in. Solder connections up to 2 /8 in. Extended ends for soldering make installation easy It is not necessary to dismantle the valve when soldering in. EVR are also available with flange connections Polski Rejestr Statków, Polen MRS, Maritime Register of Shipping, Russia Versions with UL approval can be supplied to order. Ambient temperature and enclosure for coil See "Coils for solenoid valves", RD.J.E DKRCCPDBB0A H275 Danfoss A/S,
5 Technical data (continued) Opening differential pressure with standard coil Δp bar Max. (= MOPD) liquid 2 ) Temperature of medium Max. working pressure PB k v value ) Min. 0 W a. c. 2 W a. c. 20 W d. c. C bar m /h EVR EVR NO EVR EVR 0 NO EVR EVR 5 NO (a.c.) (d.c.) NO EVR EVR 22 NO ) ) ) ) The k v value is the water flow in m /h at a pressure drop across valve of bar, ρ = 000 kg/m. 2 ) MOPD for media in gas form is approx. bar greater. ) Min. diff. pressure 0.07 bar is needed to stay open. Rated capacity kw Liquid Suction vapour Hot gas R22 R4a R404A/R507 R407C R22 R4a R404A/R 507 R407C R22 R4a R404A/R507 R407C EVR EVR EVR EVR EVR Rated liquid and suction vapour capacity is based on evaporating temperature t e = -0 C, liquid temperature ahead of valve t l = C, pressure drop in valve Δp = 5 bar. Rated hot gas capacity is based on condensing temperature t c = +40 C, pressure drop across valve Δp = bar, hot gas temperature t h = +65 C, and subcooling of refrigerant Δt sub = 4 K. Danfoss A/S, DKRCCPDBB0A H275 5
6 Ordering Complete valves Normally closed (NC) with a.c. coil ) Code no. Connection Valve body + 0 W a. c. coil with m cable Flare 2 ) Solder ODF in. mm in./mm in. mm EVR / F809 02F F2052 / F807 02F F2092 EVR 0 / F809 02F222 02F22 EVR 5 5 / F802 02F292 02F292 Code no. Connection Valve body + 0 W a. c. coil with terminal box Flare 2 ) Solder ODF in. mm in./mm in. mm EVR / F80 02F204 02F205 / F F208 02F209 EVR 0 / F F22 02F2 EVR 5 5 / F80 02F29 02F29 7 / F224 02F224 ) Please specify code no., voltage and frequency. Voltage and frequency can also be given in the form of an appendix number, see table "Appendix numbers". 2 ) Supplied without flare nuts. Separate flare nuts: / 4 in. or 6 mm, code no. 0L0 / 8 in. or 0 mm, code no. 0L5 / 2 in. or 2 mm, code no. 0L0 5 / 8 in. or 6 mm, code no. 0L67 ) Can only be used with DIN plug Appendix numbers Voltage V Frequency Hz /60 50/60 Energy consumpt. W Appendix no DKRCCPDBB0A H275 Danfoss A/S,
7 Ordering (conmtinued) Components Flare and solder connections Separate valve bodies, normally closed (NC) Required coil type Connection Flare ) in. mm in./mm in. mm EVR 2 a.c. / F F20 02F202 EVR EVR 0 EVR 5 a.c./d.c. / F807 02F206 02F207 / F86 02F204 02F208 / F F22 02F2 / F F209 02F26 / F F27 02F28 5 / F F24 02F24 5 / F80 02F228 02F228 Code no. Valve body without coil Solder ODF With manual With manual operation 5 / F800 2 ) 02F227 7 / F225 02F225 7 / F240 02F240 a.c. 7 / F254 / F244 02F245 7 / F264 02F264 d.c. 7 / F274 EVR 22 a.c. / F267 02F267 a.c./d.c. Without manual operation / 8 02F F F F2206 / F F2208 / H05 042H06 5 / 8 042H0 042H H07 042H08 5 / 8 042H09 042H H 042H4 2 / H 042H2 Separate valve bodies, normally open (NO) ) Code no. Required Connection Valve body without coil ) coil type Flare ) Solder ODF in. mm in. mm in. mm / F F F290 02F295 EVR 0 / F809 02F809 02F29 02F296 5 / F F F299 02F299 EVR 5 a.c./d.c. 7 / F270 02F270 7 / F260 02F260 / F269 02F279 EVR 22 a.c. / F268 02F268 ) Valve bodies are supplied without flare nuts. Separate flare nuts: / 4 in. or 6 mm, code no. 0L0 / 8 in. or 0 mm, code no. 0L5 / 2 in. or 2 mm, code no. 0L0 5 / 8 in. or 6 mm, code no. 0L67 2 ) With manual operation. ) The normal range of coils can be used for the NO valves, with the exception of the double frequency versions of 0 V, 50/60 Hz and 220 V, 50/60 Hz. Coils See "Coils for solenoid valves", RD.J.E2.02. Danfoss A/S, DKRCCPDBB0A H275 7
8 Ordering (continued) Components Flare and solder connections Separate valve bodies, normally closed (NC) EVR 5 Require coil type Connection Code no. Valve body + gaskets +bolts; without coil and flanges Without manual operation Without manual operation a.c./d.c. 02F24 02F224 a.c. Flanges 02F25 02F24 d.c. 02F27 02F26 Coils See "Coils for solenoid valves", RD.J.E2.02. Flange sets Valve type EVR 5 Connection Code no. Solder Weid in. mm in. mm in. / 2 027N5 5 / L7 027L6 / 4 027N20 7 / L2 027L22 / 4 027N220 7 / L22 027L N225 / L L228 Example EVR 5 without manual operation, code no. 02F224 + /2 in. weld flange set, code no. 027N5 + coil with termfnal box, 220 V, 50 Hz, code no. 08F670 (See "Coils for solenoid valves", RD.J.E2.02.). Accessories Description Mounting bracket for EVR 2,, 6 and 0 Strainer FA for direct mounting Code no. 02F097 See "FA" 8 DKRCCPDBB0A H275 Danfoss A/S,
9 Capacity Liquid capacity Q e kw Liquid capacity Q e kw at pressure drop across valve Δp bar EVR EVR EVR EVR EVR R22 Liquid capacity Q e kw Capacities are based on liquid temperature t l = C ahead of valve, evaporating temperature t e = 0 C, superheat 0 K. Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of valve/evaporator. When the corrected capacity is known, the selection can be made from the table. R4a Liquid capacity Q e kw at pressure drop across valve Δp bar EVR EVR EVR EVR EVR Liquid capacity Q e kw R404A/R507 Liquid capacity Q e kw at pressure drop across valve Δp bar EVR EVR EVR EVR EVR Correction factors for liquid temperature t l t l C R R4a R404A/R Danfoss A/S, DKRCCPDBB0A H275 9
10 Capacity (continued) Liquid capacity Q e kw R407C Liquid capacity Q e kw at pressure drop across valve Δp bar EVR EVR EVR EVR EVR Capacities are based on liquid temperature t l = C ahead of valve, evaporating temperature t e = 0 C, and superheat 0 K. Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of valve/evaporator. When the corrected capacity is known, the selection can be made from the table. Correction factors based on liquid temperature t l t l C R407C Capacities are based on liquid temperature t l = C ahead of evaporator. The table values refer to the evaporator capacity and are given as a function of evaporating temperature t e and pressure drop Δp across valve. Capacities are based on dry, saturated vapour ahead of valve. During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 0 K superheat. Suction vapour capacity Q e EVR 0 EVR 5 EVR 22 Pressure drop Δp bar Suction vapour capacity Q e kw at evaporating temperature t e C R Correction factors When sizing valves, the evaporator capacity must be divided by a correction factor depending on liquid temperature t l ahead of expansion valve. When the corrected capacity is known, the selection can be made from the table. Correction factors for liquid temperature t l t l C R DKRCCPDBB0A H275 Danfoss A/S,
11 Capacity (continued) Capacities are based on liquid temperature t l = C ahead of evaporator. The table values refer to the evaporator capacity and are given as a function of evaporating temperature t e and pressure drop Δp across valve. Capacities are based on dry, saturated vapour ahead of valve. During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 0 K superheat. Suction vapour capacity Q e EVR 0 EVR 5 EVR 22 Suction vapour capacity Q e kw EVR 0 EVR 5 EVR 22 Pressure drop across valve Δp bar Pressure drop across valve Δp bar R404A/R507 Suction vapour capacity Q e kw at evaporating temperature t e C R4a Suction vapour capacity Q e kw at evaporating temperature t e C Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of valve/evaporator. When the corrected capacity is known, the selection can be made from the table. Correction factors based on liquid temperature t l t l C R4a R404A/R Danfoss A/S, DKRCCPDBB0A H275
12 Capacity (continued) Pressure drop across valve Δp bar R407C Suction vapour capacity Q e kw at evaporating temperature t e C EVR EVR Capacities are based on liquid temperature t l = C ahead of evaporator. The table values refer to the evaporator capacity and are given as a function of evaporating temperature t e and pressure drop Δp across valve. Capacities are based on dry, saturated vapour ahead of valve. During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 0 K superheat. EVR Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of expansion valve. When the corrected capacity is known, the selection can be made from the table. Correction factors based on liquid temperature t l t l C R407C Hot gas defrosting With hot gas defrosting it is not normally possible to select a valve from condensing temperature t c and evaporating temperature t e. This is because the pressure in the evaporator as a rule quickly rises to a value near that of the condensing pressure. It remains at this value until the defrosting is finished. In most cases therefore, the valve will be selected from condensing temperature t c and pressure drop Δp across the valve, as shown in the example for heat recovery. Heat recovery The following is given: Refrigerant = R22 Evaporating temperature t e = 0 C Condensing temperature t c = + 40 C Hot gas temperature ahead of valve t h = + 85 C Heat recovery condenser yield Q h = 8 kw The capacity table for 22 with t c = + 40 C gives the the capacity for an EVR 0 as 8.9 kw, when pressure drop Δp is bar. The correction factor for t e = 0 C is given in the table as The correction for hot gas temperature t h = + 85 C has been calculated as 4% which corresponds to a factor of.04. Q h must be corrected with factors found: With Δp = bar is Q h = 8.9 x 0.94 x.04 = 8.7 kw. With Δp = bar, Q h becomes only 6. x 0.94 x.04 = 6.2 kw. An would also be able to give the required capacity, but with Δp at approx. bar. The is therefore too small. The EVR is so large that it is doubtful whether the necessary Δp of apprx. bar could be obtained. An EVR 5 would therefore be too large. Result: An EVR 0 is the correct valve for the given conditions. 2 DKRCCPDBB0A H275 Danfoss A/S,
13 Capacity (continued) An increase in hot gas temperature t h of 0 K, based on t h = t c C, reduces valve capacity approx. 2% and vice versa. A change in evaporating temperature t e changes valve capacity; see correction factor table below. Hot gas capacity Q h kw EVR 2 EVR EVR 0 EVR 5 EVR 22 Pressure drop across valve Δp bar Hot gas capacity Q h kw Evaporating temp. t e =-0 C. Hot gas temp. t h =t c C. Subcooling Δt sub =4 K Condensing temperature t c C R Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature t e. Correction factors for evaporating temperatur t e t e C R Danfoss A/S, DKRCCPDBB0A H275
14 Capacity (continued) An increase in hot gas temperature t h of 0 K, based on t h = t c C, reduces valve capacity approx. 2% and vice versa. A change in evaporating temperature t e changes valve capacity; see correction factor table below. Hot gas capacity Q h kw EVR 2 EVR EVR 0 EVR 5 EVR 22 Pressure drop across valve Δp bar Hot gas capacity Q h kw R4a Evaporating temp. t e =-0 C. Hot gas temp. t h =t c C. Subcooling Δt sub =4 Kv Condensing temperature t c C Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature t e. Correction factors for evaporating temperatur t e t e C R4A DKRCCPDBB0A H275 Danfoss A/S,
15 Capacity (continued) An increase in hot gas temperature t h of 0 K, based on t h = t c C, reduces valve capacity approx. 2% and vice versa. A change in evaporating temperature t e changes valve capacity; see correction factor table below. Hot gas capacity Q h kw EVR 2 EVR EVR 0 EVR 5 EVR 22 Pressure drop across valve Δp bar Hot gas capacity Q h kw R404A/R507 Evaporating temp. t e =-0 C. Hot gas temp. t h =t c C. Subcooling Δt sub =4 K Condensing temperature t c C Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature t e. Correction factors for evaporating temperatur t e t e C R440A/R Danfoss A/S, DKRCCPDBB0A H275 5
16 Capacity (continued) An increase in hot gas temperature t h of 0 K, based on t h = t c C, reduces valve capacity approx. 2% and vice versa. A change in evaporating temperature t e changes valve capacity; see correction factor table below. Hot gas capacity Q h kw EVR 2 EVR EVR 0 EVR 5 EVR 22 Pressure drop across valve Δp bar Hot gas capacity Q h kw R407C Evaporating temp. t e =-0 C. Hot gas temp. t h =t c C. Subcooling Δt sub =4 K Condensing temperature t c C Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature t e Correction factors for evaporating temperatur t e t e C R407C DKRCCPDBB0A H275 Danfoss A/S,
17 Capacity (continued) An increase in hot gas temperature t h of 0 K reduces valve capacity approx. 2% and vice versa. Hot gas capacity G h kg/s EVR 2 EVR EVR 0 EVR 5 EVR 22 EVR 2 EVR EVR 0 EVR 5 EVR 22 Hot gas temperature th C +90 Hot gas temperature th C +60 Condensing temperature tc C Condensing temperature tc C Hot gas capacity G h kg/s at pressure drop across valve Δp bar R Hot gas capacity G h kg/s at pressure drop across valve Δp bar R4a Danfoss A/S, DKRCCPDBB0A H275 7
18 Capacity (continued) Hot gas capacity G h kg/s EVR 2 EVR EVR 0 EVR 5 EVR 22 Hot gas temperature th C +60 Condensing temperature tc C Hot gas capacity G h kg/s at pressure drop across valve Δp bar R404A/R R407C Hot gas temperature th C Condensing temperature tc C Hot gas capacity G h kg/s at pressure drop across valve Δp bar EVR EVR EVR EVR EVR An increase in hot gas temperature t h of 0 K reduces valve capacity approx. 2% and vice versa DKRCCPDBB0A H275 Danfoss A/S,
19 Design / Function EVR 2 (NC) EVR 0 (NC) EVR 0 (NO) (NC) and 40 (NC) 4. Coil 6. Armature 8. Valve plate / Pilot valve plate 20. Earth terminal 24. Connection for flexible steel hose 28. Gasket 29. Pilot orifice 0. O-ring. Piston ring 6. DIN plug 7. DIN socket (to DIN 4650) 40. Protective cap/terminal box 4. Valve cover 44. O-ring 45. Valve cover gasket 49. Valve body 50. Gasket 5. Threaded plug 5. Manual operation spindle 7. Equalization hole 74. Main channel 75. Pilot channel 76. Compression spring 80. Diaphragm/Servo piston 8. Valve seat 84. Main valve plate 90. Mounting hole EVR solenoid valves are designed on two different principles:. Direct operation 2. Servo operation. Direct operation EVR 2 and are direct operated. The valves open direct for full flow when the armature (6) moves up into the magnetic field of the coil. This means that the valves operate with a min. differential pressure of 0 bar. The teflon valve plate (8) is fitted direct on the armature (6). Inlet pressure acts from above on the armature and the valve plate. Thus, inlet pressure, spring force and the weight of the armature act to close the valve when the coil is currentless. 2. Servo operation 22 are servo operated with a "floating" diaphragm (80). The pilot orifice (29) of stainless steel is placed in the centre of the diaphragm. The teflon pilot valve plate (8) is fitted direct to the armature (6). When the coil is currentless, the main orifice and pilot orifice are closed. The pilot orifice and main orifice are held closed by the weight of the armature, the armature spring force and the differential pressure between inlet and outlet sides. When current is applied to the coil the armature is drawn up into the magnetic field and opens the pilot orifice. This relieves the pressure above the diaphragm, i.e. the space above the diaphragm becomes connected to the outlet side of the valve. The differential pressure between inlet and outlet sides then presses the diaphragm away from the main orifice and opens it for full flow. Therefore a certain minimum differential pressure is necessary to open the valve and keep it open. For 22 valves this differential pressure is 0.05 bar. When current is switched off, the pilot orifice closes. Via the equalization holes (7) in the diaphragm, the pressure above the diaphragm then rises to the same value as the inlet pressure and the diaphragm closes the main orifice., 2 and 40 are servo operated piston valves. The valves are closed with currentless coil. The servo piston (80) with main valve plate (84) closes against the valve seat (8) by means of the differential pressure between inlet and outlet side of the valve, the force of the compression spring (76) and possibly the piston weight. When current to the coil is switched on, the pilot orifice (29) opens. This relieves the pressure on the piston spring side of the valve. The differential pressure will then open the valve. The minimum differential pressure needed for full opening of the valves is bar. EVR (NO) has the opposite function to EVR (NC), i.e. it is open with de-energised coil. EVR (NO) is available with servo operation only. Danfoss A/S, DKRCCPDBB0A H275 9
20 Material specifications EVR 2 to 25 Solenoid valves Standard No. Description Material Analysis Mat.no. W.no. DIN EN Valve body EVR 2 to 25 Brass CuZn40Pb2 CW67N EVR 2 to Stainless steel X5 CrNi Cover to 22 Brass CuZn40Pb2 CW67N Cast iron EN-GJS LT EN-JS Armature tube EVR 2 to 25 Stainless steel X2 CrNi Armature tube nut Stainless steel X8 CrNiS Gasket EVR 2 to 25 Rubber Cr 6 Gasket Al. gasket Al Solder tube Copper SF-Cu CW024A Screws EVR 2 to 25 Stainless steel A Spindle for man. operat. Stainless steel X8 CrNiS Gasket Rubber Cr to 40 Solenoid valves Standard No. Description Material Analysis Mat.no. W.no. DIN EN Valve body /40 Cast Iron EN-GJS LT EN-JS Cover /40 Brass CuZn40Pb2 CW67N Armature tube /40 Stainless steel X2 CrNi Armature tube nut /40 Stainless steel X8 CrNiS Gasket /40 Rubber Cr 6 Gasket /40 Al. gasket Al Solder tube /40 Copper SF.Cu CW024A Screws /40 Stainless steel A Spindle for. man. operation /40 Stainless steel X8 CrNiS DKRCCPDBB0A H275 Danfoss A/S,
21 Dimensions and weights EVR (NC) 2 5 and 5 (NO), flare connection Weight of coil 0 W: approx. 0. kg 2 and 20 W: approx. 0.5 kg With cable connection coil With DIN plugs coil With terminal box coil Connection NV L 5 max. Weight H Flare H 2 H H 4 L L 2 L L 4 B B max. with 0 W 2/20 W coil in. mm mm mm mm mm mm mm mm mm mm mm mm mm mm kg EVR 2 / EVR / / / / EVR 0 / / EVR 5 5 / Danfoss A/S, DKRCCPDBB0A H275 2
22 Dimensions and weights (continued) EVR (NC) 2 22 and 22 (NO), solder connection Weight of coil 0 W: approx. 0. kg 2 and 20 W: approx. 0.5 kg With cable connection coil With DIN plugs coil With terminal box coil Connection L 5 max. Weight H Solder H 2 H H 4 L L 2 L L 4 B B max. with coil 0 W 2/20 W in. mm mm mm mm mm mm mm mm mm mm mm mm mm kg EVR 2 / EVR / / / / EVR 0 / / EVR 5 5 / / / / EVR 22 / DKRCCPDBB0A H275 Danfoss A/S,
23 Dimensions and weights (continued) EVR (NC) 25, 2 og 40, solder connection and 40 terminal box and 40 with terminal box coil Weight of coil 0 W: approx. 0. kg 2 and 20 W: approx. 0.5 kg Coil with cable Coil with DIN plugs Connection Solder H H 2 H H 4 L L 2 cable connection Coil with L Coil with DIN connection L 4 Coil with terminal box L 5 max. 0 W 2/20 W in. mm mm mm mm mm mm mm mm mm mm mm mm mm kg / / / / / / B B max. Weight with coil EVR (NC) 5 and 20, flange connection Coil with cable Coil with DIN plugs Weight of coil 0 W: approx. 0. kg 2 and 20 W: approx. 0.5 kg With terminal box coil Weight of flange set For EVR 5: 0.6 kg For : 0.9 kg H H 2 H H 4 L L L 2 connection Coil with cable L Coil with DIN connection L 4 Coil with terminal box L 5 max. B B max. 0 W 2/20 W mm mm mm mm mm mm mm mm mm mm mm mm mm kg EVR Weight with coil excl. flanges Danfoss A/S, DKRCCPDBB0A H275 2
24 24 DKRCCPDBB0A H275 Danfoss A/S,
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