Pressure and temperature regulators, type PM, and pilot valves

Transcription

1 Pressure and temperature regulators, type PM, and pilot valves Introduction Main valves, type PM 1 and PM 3 Pilot valves for mounting directly into main valves, type PM Main valves, type PM 1 and PM 3 Main valve type PM is specially developed to regulate pressure and temperature in refrigeration, freezing and air conditioning plant with fluorinated refrigerants and ammonia. PM is a pilot operated main valve with screwed-in pilot valves or pilot valves mounted in an external pilot line. Main valves type PM are used in refrigeration plant with: dry evaporation pump circulation natural circulation The regulator is available in two variants, PM 1 and PM 3. PM 1 is designed to accept one pilot valve either screwed-in or mounted in an external pilot line. PM 3 will accept three screwed-in pilot valves or pilot valves mounted in an external pilot line. Thus several functions can be performed by the same valve. ã Danfoss A/S, RD.4X.A2.02 1

2 Pressure and temperature regulators, type PM, and pilot valves Pilot valves Pilot valve program contains: Pressure controlled pilot valve type CVP(LP) Pressure controlled pilot valve type CVP(HP) Pressure controlled pilot valve type CVC with pilot signal connector Differential pressure controlled pilot valve type CVPP(LP) Differential pressure controlled pilot valve type CVPP(HP) Temperature controlled pilot valve type CVT Electronically controlled pilot valve type CVQ Solenoid pilot valve type EVM-NC and EVM- NO Motor controlled pilot valve type CVPM The pilot valves can perform the following functions Constant pressure regulation Capacity regulation Crank case pressure regulation Refrigerant pressure regulation With the PM 3, pressure and temperature regulation can be combined with: electric controlled forced closing (override) electric controlled forced opening (override) electric controlled forced closing and opening (override) electric. controlled changeover between two pressure or temperature settings minimum pressure or temperature settings maximum pressure limitation or relief pneumatically controlled reference change motor operated reference change opening without pressure drop in suction lines (with external pilot pressure). Pilot valves can be mounted in external lines by using the pilot valve housing type CVH. Features Flexible function build-up PM main valve and pilot valves together have innumerable performances within: on/off regulation P-regulation PI-regulation. Simple and inexpensive installation Screw-in pilot valves, no welding or soldering. No need for a separate pilot line. Flexible and inexpensive stock control The pilot valves can be used for all sizes of PM valves. Easy and inexpensive service Quick and easy filter cleaning. Quick and easy dismantling and assembly. Spindle for manual override opening. Pressure gauge connection. Universal application in all types of plant. Advanced design Logarithmic throttle cone ensures precise regulation of small loads. Teflon seat gives an excellent seal and prevents cavitation. Low pressure drop despite the servo principle means energy savings. PM valves can be supplied in both GG-25 and GGG Pilot valves where applicable, are supplied in GGG RD.4X.A2.02 ã Danfoss A/S,

3 Pressure and temperature regulators, type PM, and pilot valves Configuration examples Constant pressure regulation Maintenance of a constant evaporating pressure. PM 1 main valve with screwed-in CVP (LP) pressure pilot valve Constant pressure regulation combined with electric shut-off override Maintenance of a constant evaporating pressure combined with electric shut-off override. PM 3 main valve with screwed-in EVM solenoid pilot valve and CVP (LP) pressure pilot valve. Electronic media temperature regulation Maintenance of a constant media temperature. PM 1 main valve with screwed-in CVQ electric pilot valve and assosiated EKS 61 electronic regulator. Constant pressure regulation combined with electric open override Maintenance of a constant condensing pressure combined with electric forced open override. PM 3 main valve with screwed-in EVM solenoid pilot valve and CVP (HP) pressure pilot valve. On-off regulation Solenoid valve for electric shut-off of suction lines, liquid lines, condensate lines or bypass lines. PM 1 main valve with screwed-in EVM solenoid pilot valve. External control pressure with electric on/off regulation combined with evaporator pressure regulation PM 3 regulator opens with no pressure drop, e.g. using gas from high-pressure side. PM 3 main valve with screwed-in external pilot connector, EVM solenoid pilot valve and CVP (LP) pressure pilot valve. Differential pressure regulation Maintenance of a constant differential pressure across the liquid regulating valve in a pump circulation system. PM 1 main valve with screwed-in CVPP (LP) differential pressure pilot valve. Thermostatic regulation combined with constant pressure regulation Maintenance of a constant medium temperature (in a water chiller for example) combined with limitation of the evaporating pressure. PM 3 main valve with screwed-in CVP (LP) pressure pilot valve and CVT temperature pilot valve. External control pressure with electric on/off regulation Opening of PM 1 main valve with no pressure drop, e.g. with gas from the high-pressure side. PM 1 main valve with screwed-in external pilot connection and EVM solenoid pilot valve in the pilot line (not shown). Electronic media temperature combined with constant pressure regulation Maintenance of a constant medium temperature combined with limitation of the evaporating pressure. PM 3 main valve with screwed-in CVP (LP) pressure pilot valve and CVQ electric pilot valve and associated EKS 61 electronic regulator. ã Danfoss A/S, RD.4X.A2.02 3

4 Main valves, type PM Technical data Size PM1 5 and PM PM3 Refrigerants 1 ) R 22, R 134a, R 404A, R 12, R 502, R 717 (NH 3 ) Opening differential pressure Dp bar Fully open Max. (MOPD) 3 ) Temperature Max. working of medium pressure PB Max. test pressure p' Min. 10 W a.c. 20 W d.c. C 4 ) bar 2 ) bar R 22, R 134a, 80 R 404A, R 12, R 502, R 717 (NH 3 ) 1 ) Other fluorinated refrigerants can be used at the stated temperatures and pressures. 2 ) Max. working pressure is limited to PB = 21 bar at temperatures below 10 C applied to GG-25 valves, and temperatures below 20 C applied to GGG-40.3 valves. 3 ) Solenoid valves only. 4 ) For lower temperature applications ( 50 C to 60 C) bolts in flanges and on top and bottom covers must be changed to stainless steel type A4 quality 80 (see spare parts catalogue for ordering). Rated capacity Valve size Rated capacity in kw The rated capacity is given for 10 C evaporating temperature, +25 C liquid temperature ahead of the expansion valve and a pressure drop of 0.2 bar across PM valve. Extended capacities, see following pages. 1 ) The k v value is the flow of water in m 3 /h at a pressure drop across valve of 1 bar, r = 1000 kg/m 3. k v value R 22 R 134a R 404A R 12 R 502 R 717 m 3 /h 1 ) Liquid PM PM PM PM PM PM PM PM PM PM PM PM Valve size Rated capacity in kw Suction gas PM PM PM PM PM PM PM PM PM PM PM PM The rated capacity is given for 10 C evaporating temperature, +25 C liquid temperature ahead of the expansion valve and a pressure drop of 0.2 bar across PM valve. Extended capacities, see following pages. 1 ) The k v value is the flow of water in m 3 /h at a pressure drop across valve of 1 bar, r = 1000 kg/m 3. k v value R 22 R 134a R 404A R 12 R 502 R 717 m 3 /h 1 ) 4 RD.4X.A2.02 ã Danfoss A/S,

5 Main valves, type PM Rated capacity (continued) Valve size Rated capacity in kw Hot gas PM PM PM PM PM PM PM PM PM PM PM PM The rated capacity is given for 10 C evaporating temperature, +25 C liquid temperature ahead of the expansion valve and a pressure drop of 0.2 bar across PM valve. Extended capacities, see following pages. 1 ) The k v value is the flow of water in m 3 /h at a pressure drop across valve of 1 bar, r = 1000 kg/m 3. k v value R 22 R 134a R 404A R 12 R 502 R 717 m 3 /h 1 ) Ordering 1 ) Code nos. apply to one flange set consisting of an inlet and an outlet flange. 2 ) Dimension sketch se spare part catalogue. Function indicator Main valve incl. flange gaskets and flange bolts Valve type Code no. GG-25 GGG-40.3 PM F F3001 PM F F3002 PM F F3003 PM F F3004 PM F F3005 PM F F3006 PM F F3007 PM F F3008 PM F F3009 Flange set 2 ) Valve Flange type Valve type Code no. GG-25 GGG-40.3 PM F F3010 PM F F3011 PM F F3012 PM F F3013 PM F F3014 PM F F3015 PM F F3016 PM F F3017 PM F F3018 PM ) 027F1270 PM ) 027F1275 PM ) 027F ) PM 3-80 PM delivered complete with flanges. Weld flange Solder flange in. Code no. 1 ) in. Code no. 1 ) mm Code no. 1 ) 3/4 027N1220 7/8 027L L1222 PM N /8 027L L /4 027N1230 PM /4 027N /2 027N /8 027L L /2 027N2440 PM /8 027L L N N2550 PM /8 027L L /2 027N /2 027N2665 PM /8 027L L N2680 PM 80 14A 4 PM B 5 PM C 6 The valves are delivered with weld flanges included in the code numbers. Accessories Description Code no. Pressure gauge connection, Æ 6.5 / Æ 10 mm weld / solder 027B2035 Pressure gauge connection, 1 /4 in. flare (self-closing) Must not be used in ammonia plant 027B2041 Pressure gauge connection, Cutting ring connection 6 mm 027B mm 027B2064 Pressure gauge connection 1 /4 NPT 027B2062 Function indicator Can be fitted in place of the regulator bottom plug. When the protective cap of the indicator is removed, 027F0085 the degree of opening of the PM-regulator can be observed External pilot connection (incl. damping orifice, D: 1.0 mm) 027F1048 Damping orifice for EVM, 10 pcs. 027F0664 Accessory bag with gasket and O-ring for the pilot valve 027F0666 Stainless steel: flanges, bolts for flanges and bolts for top and bottom covers, see spare part catalogue for ordering. ã Danfoss A/S, RD.4X.A2.02 5

6 Pilot valves for PM main valves Technical data and ordering CVP Max. Description working k v -value Range Code no. pressure [m PB [bar] 3 /h] The k v -values are measured with the pilot valves mounted to a CVH house for external pilot line. Note: the k v -value can vary slightly depending of the set point. Pressure controlled pilot valve CVP (LP) For low pressure bar 027B1100 CVP (LP) For low pressure bar 027B1101 CVP (HP) For high pressure bar 027B1160 CVP (HP) For high pressure bar 027B1161 CVP (HP) For high pressure bar 027B1164 Notes The LP-versions must not be exposed to pulsations. (LP) (HP) CVPP Differential pressure controlled pilot valve CVPP (LP) For low pressure Dp = 0 7 bar 027B1102 CVPP (HP) For high pressure Dp = 0 7 bar 027B1162 CVPP (HP) For high pressure Dp = 4 22 bar 027B1168 Reference pressure max. 3 bar above media pressure. (LP) (HP) CVC CVT/CVTO CVQ Pressure controlled pilot valve with external reference pressure connection CVC 28/ bar 027B1070 Temperature controlled pilot valve (pressure independent) CVT Opens at rising temp C 027B1110 CVT Opens at rising temp C 027B1111 CVT Opens at rising temp C 027B1112 CVT Opens at rising temp C 027B1116 CVTO Closes at rising temp C 027B1117 CVTO Closes at rising temp C 027B1118 CVTO Closes at rising temp C 027B1119 Electronically controlled pilot valve (pressure dependent) CVQ bar 027B1139 CVQ bar 027B1140 CVQ bar 027B1141 The max. working pressures refers to the high pressure side connection (28 bar) and the reference pressure connection (17 bar). Reference pressure must be connected to the low pressure side of the system. CVT opens at rising temperature. CVTO closes at rising temperature. Lenght of capillary tube: 5 m. CVQ works in connection with controller type EKS 61 or interface type EKA 46. CVP(M) Motor controlled pilot valve (pressure dependent) CVPM 220 V a.c., 50/60 Hz bar 027B1171 CVPM 24 V a.c bar 027B1173 Pilot valve for motor controlled pilot valve (pressure dependent) CVP(M) Without motor bar 027B1170 CVPM is a complete motor controlled pilot valve with motor type AMV 523. CVPM EVM (NC) (NO) Valve body for EVM EVM Normally closed MOPD = 21 bar 1 ) 027B1120 EVM Normally open MCPD = 21 bar 2 ) 027B1130 Coils, see "Coils for solenoid valve" RD.3J.B ) MOPD = max. opening differential pressure with a 10 W a.c. coil. 2 ) MOPD = max. closing differential pressure with a 12 W a.c. coil. 6 RD.4X.A2.02 ã Danfoss A/S,

7 Pilot valves for PM main valves Technical data and ordering (continued) Housing for pilot valves for external pilot line Connection G Standard CVH 6 Inside pipe thread 1 / 4 in. NPT ANSI B Material specification DIN. 9S Mn Pb 28 W no Code no. 027F1159 Connection G Standard CVH 6 Inside pipe thread G 1 / 4 A ISO Material specification DIN. 9S Mn Pb 28 W no Code no. 027F1160 OD ID Material Connection mm mm Standard specification CVH 10 3 Welding branch DIN. CK 15. / 8 in. welding neck DIN W no Code no. 027F1047 OD ID Material Connection mm mm Standard specification CVH 15 1 Welding branch DIN. CK 15. / 2 in. welding neck DIN W no Code no. 027F1090 OD ID Material Connection mm mm Standard specification CVH 15 1 DIN T2 DIN. CK 15. / 2 in. socket weld ASME B M W no Code no. 027F1091 ã Danfoss A/S, RD.4X.A2.02 7

8 Extended capacities for PM main valves Capacities Liquid capacity for PM 1 and PM 3 Liquid cap. Q e kw at a pressure drop across valve Dp bar Liquid cap. Q e kw at a pressure drop across valve Dp bar R 22 R 404A PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM R 134a R 717 (NH 3 ) PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM The capacities are based on liquid temperature t l = 25 C, subcooling = 0 K, evaporating temperature t e = 10 C and superheat = 0 K. Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the liquid temperature ahead of the valve / evaporator. The selection can then be made from the table. t l C R R 134a R 404A R 717 (NH 3 ) kw = tons (TR) 8 RD.4X.A2.02 ã Danfoss A/S,

9 Extended capacities for PM main valves Capacities (continued) Suction vapour capacity for PM 1 and PM 3 The capacities are based on liquid temperature t l = 25 C ahead of the evaporator. The table values refer to the evaporator capacity and are tabulated as a function of the evaporating temperature t e and the pressure drop Dp across the valve. The capacities are based on dry, saturated gas ahead of the valve. Under operation with superheated gas ahead of the valve the capacities are reduced by 4% for every 10 K superheat. R 22 Dp Suction vapour capacity Q e kw at evaporating temperature t e C bar PM PM PM PM PM PM PM PM PM PM PM PM Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the liquid temperature ahead of the valve / evaporator. The selection can then be made from the table. t l C R ã Danfoss A/S, RD.4X.A2.02 9

10 Extended capacities for PM main valves Capacities (continued) Suction vapour capacity for PM 1 and PM 3 The capacities are based on liquid temperature t l = 25 C ahead of the evaporator. The table values refer to the evaporator capacity and are tabulated as a function of the evaporating temperature t e and the pressure drop Dp across the valve. The capacities are based on dry, saturated gas ahead of the valve. Under operation with superheated gas ahead of the valve the capacities are reduced by 4% for every 10 K superheat. R 134a Dp Suction vapour capacity Q e kw at evaporating temperature t e C bar PM PM PM PM PM PM PM PM PM PM PM PM Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the liquid temperature ahead of the valve / evaporator. The selection can then be made from the table. t l C R 134a RD.4X.A2.02 ã Danfoss A/S,

11 Extended capacities for PM main valves Capacities (continued) Suction vapour capacity for PM 1 and PM 3 The capacities are based on liquid temperature t l = 25 C ahead of the evaporator. The table values refer to the evaporator capacity and are tabulated as a function of the evaporating temperature t e and the pressure drop Dp across the valve. The capacities are based on dry, saturated gas ahead of the valve. Under operation with superheated gas ahead of the valve the capacities are reduced by 4% for every 10 K superheat. R 404A Dp Suction vapour capacity Q e kw at evaporating temperature t e C bar PM PM PM PM PM PM PM PM PM PM PM PM Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the liquid temperature ahead of the valve / evaporator. The selection can then be made from the table. t l C R 404A ã Danfoss A/S, RD.4X.A

12 Extended capacities for PM main valves Capacities (continued) Suction vapour capacity for PM 1 and PM 3 The capacities are based on liquid temperature t l = 25 C ahead of the evaporator. The table values refer to the evaporator capacity and are tabulated as a function of the evaporating temperature t e and the pressure drop Dp across the valve. The capacities are based on dry, saturated gas ahead of the valve. Under operation with superheated gas ahead of the valve the capacities are reduced by 4% for every 10 K superheat. R 717 (NH 3 ) Dp Suction vapour capacity Q e kw at evaporating temperature t e C bar PM PM PM PM PM PM PM PM PM PM PM PM Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the liquid temperature ahead of the valve / evaporator. The selection can then be made from the table. t l C R 717 (NH 3 ) RD.4X.A2.02 ã Danfoss A/S,

13 Extended capacities for PM main valves Capacities (continued) Hot gas capacity for PM 1 and PM 3 R 22 Hot gas capacity for PM 1 and PM 3 Evaporating temp. t e C Hot gas capacity in kw at pressure drop across valve Dp bar PM PM PM PM PM PM Evaporating temp. t e C Hot gas capacity in kw at pressure drop across valve Dp bar R PM PM PM PM PM PM The capacities are based on condensing temperature t c = 35 C, subcooling t sub = 4 K, superheating at evaporator discharge of 10 K and a hot gas temperature t h = 60 C. An increase of the superheating at the evaporator outlet of 10 K reduces the capacities by 2% and vice versa. Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the subcooling ahead of the valve / evaporator. The selection can then be made from the table. t sub K R ã Danfoss A/S, RD.4X.A

14 Extended capacities for PM main valves Capacities (continued) Hot gas capacity for PM 1 and PM 3 R 134a Hot gas capacity for PM 1 and PM 3 Evaporating temp. t e C Hot gas capacity in kw at pressure drop across valve Dp bar PM PM PM PM PM PM Evaporating temp. t e C R 134a Hot gas capacity in kw at pressure drop across valve Dp bar PM PM PM PM PM PM The capacities are based on condensing temperature t c = 35 C, subcooling t sub = 4 K, superheating at evaporator discharge of 10 K and a hot gas temperature t h = 60 C. An increase of the superheating at the evaporator outlet of 10 K reduces the capacities by 2% and vice versa. Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the subcooling ahead of the valve / evaporator. The selection can then be made from the table. t sub K R 134a RD.4X.A2.02 ã Danfoss A/S,

15 Extended capacities for PM main valves Capacities (continued) Hot gas capacity for PM 1 and PM 3 R 404A Hot gas capacity for PM 1 and PM 3 Evaporating temp. t e C Hot gas capacity in kw at pressure drop across valve Dp bar PM PM PM PM PM PM Evaporating temp. t e C R 404A Hot gas capacity in kw at pressure drop across valve Dp bar PM PM PM PM PM PM The capacities are based on condensing temperature t c = 35 C, subcooling t sub = 4 K, superheating at evaporator discharge of 10 K and a hot gas temperature t h = 60 C. An increase of the superheating at the evaporator outlet of 10 K reduces the capacities by 2% and vice versa. Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the subcooling ahead of the valve / evaporator. The selection can then be made from the table. t sub K R 404A ã Danfoss A/S, RD.4X.A

16 Extended capacities for PM main valves Capacities (continued) Hot gas capacity for PM 1 and PM 3 R 717 (NH 3 ) Hot gas capacity for PM 1 and PM 3 Evaporating temp. t e C Hot gas capacity in kw at pressure drop across valve Dp bar PM PM PM PM PM PM Evaporating temp. t e C R 717 (NH 3 ) Hot gas capacity in kw at pressure drop across valve Dp bar PM PM PM PM PM PM The capacities are based on condensing temperature t c = 35 C, subcooling t sub = 4 K, superheating at evaporator discharge of 10 K and a hot gas temperature t h = 90 C. An increase of the superheating at the evaporator outlet of 10 K reduces the capacities by 2% and vice versa. Correction factors When selecting, the evaporator capacity is to be multiplied by a correction factor depending on the subcooling ahead of the valve / evaporator. The selection can then be made from the table. t sub K R 717 (NH 3 ) RD.4X.A2.02 ã Danfoss A/S,