Electric Control Valve
Cryogenic Pneumatic Control Valve
cryogenic pneumatic control valve
Technical specification
2.1Date sheet
| Pneumatic cryogenic control valve Body type: | straight through casting globe type |
| Valve plug type: | non-balanced single seat plug type |
| Nominal size: | DN20~200,、 NPS 3/4〞~ 8〞 |
| Nominal pressure: | PN16 ~ 100、 CLASS 150LB ~ 600LB |
| Connection: flange: | FF、RF、MF、RTJ |
| Welding: | SW、BW |
| Flange dimension: | According to to IEC 60534 |
| Pneumatic cryogenic regulating valve Bonnet type: | Ⅲ:Low temperature extended type（-196℃~ 45℃） |
| Packing: | V type PFTE packing, flex. graphite packing, etc. |
| Gasket: | Metal graphite packing |
| Pneumatic cryogenic regulating valveActuator: | Pneumatic: multi-spring diaphragm actuator, piston type actuator. |
2.2 Cryogenic control valve structure drawing
2.3 Cryogenic control valve material list
| Component name | Control Valve Material |
| Body/Bonnet | LCB/LCC/LF2/CF8/CF8M/CF3M |
| Valve spool/Seat | 304/316/316L(overlaying stellite alloy) |
| Packing | Normal:-196～150℃ is PTFE |
| Gasket | Normal:Stainless steel with flexible graphite,Special:Metal tooth type gasket |
| Diaphragm Cover | Normal:Q235,Special:304 |
| Diaphragm | NBR with reinforced polyester fabric |
| Spring | Normal:60Si2Mn,Special:50CrVa |
| Control valve stem | 2Cr13/17-4PH/304/316/316L |
2.4 Low temperature material suitable temperature list
| Casting | Forging | ||
| Materials | Lowest working temperature |
Materials | Lowest working temperature |
| LCB | -46°C | LF2 | -46°C |
| LCC | -46°C | -46°C | |
| LC1 | -59°C | LF5 | -59°C |
| LC2 | -73°C | LF9 | -73°C |
| LC3 | -101°C | LF3 | -101°C |
| CF8 | -254°C | F304 | -254°C |
| CF8M | -254°C | F316 | -254°C |
| CF3 | -254°C | F304L | -254°C |
| CF3M | -254°C | F316L | -254°C |
2.5 Cryogenic control valve performance
| Pneumatic cryogenic regulating valve Flow characteristic |
Linear, percentage, quick open |
| Allowable range | 50: 1 (CV<6.3 30: 1) |
| Rated Cv value | Percentage CV1.6~630 ，linear CV1.8~690 |
| Pneumatic cryogenic regulating valve Allowable leakage | Metal seal: IV grade（0.01% rated capacity） Soft seal: VI grade（foam grade） Leakage standard: GB/T 4213 |
| Pneumatic cryogenic regulating valve Performance | |
| Intrinsic error % | ±1.5 |
| Return difference, % | ≤1.5 |
| Dead zone, % | ≤0.6 |
| Difference from beginning to end point, % | ±2.5 |
| Rated travel difference, % | ≤2.5 |
2.6 Cryogenic control valve actuator parameter
| Control Valve Type\ Method | Pneumatic diaphragm actuator |
| PZMA-4~PZMA-7 | |
| Multi-spring type | |
| Usage | Regulating type, ON-OFF type |
| Air supply pressure or Power supply voltage | Air supply pressure (Spring range) 140（20～100）Kpa G 240 (40～200) Kpa G 280 (80～240) Kpa G |
| Connector | Air pipe connector: RC1/4 |
| Direct action | Pressure increase, stem descend, valve close. |
| Reaction | Pressure increase, stem ascend, valve open. |
| Input signal | 40～20mA.DC（with positioner） |
| Lag | ≤1%FS（with positioner） |
| Linear type | 2%FS（with positioner） |
| Environmental temperature | -10℃～+70℃ |
| Pneumatic cryogenic regulating valve Accessories |
E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch Non-standard accessories, need special customized notes. |
2.7 Cryogenic control valve technical parameter
| Seat diameter(mm) | 10 | 12 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
| Rated Cv | Percentage | 1.6 | 2.5 | 4.0 | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 160 | 250 | 400 | 630 |
| Linear | 1.8 | 2.8 | 4.4 | 6.9 | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 690 | |
| Nom. size | Travel | Option flow characteristic Cv. (★standard ●recommanded ○customized) | |||||||||||||
| DN20 | 16mm | ● | ● | ● | ★ | ||||||||||
| DN25 | ● | ● | ● | ● | ★ | ||||||||||
| DN32 | 25 mm | ○ | ○ | ○ | ○ | ○ | ★ | ||||||||
| DN40 | ○ | ○ | ○ | ○ | ● | ★ | |||||||||
| DN50 | ○ | ○ | ○ | ● | ● | ★ | |||||||||
| DN65 | 40mm | ○ | ○ | ○ | ★ | ||||||||||
| DN80 | ○ | ○ | ○ | ● | ★ | ||||||||||
| DN100 | ○ | ○ | ○ | ● | ● | ★ | |||||||||
| DN125 | 60mm | ○ | ○ | ○ | ★ | ||||||||||
| DN150 | ○ | ○ | ● | ★ | |||||||||||
| DN200 | ○ | ○ | ● | ● | ★ | ||||||||||
| Pneumatic actuator Diaphragm area, Ae(cm2) |
PZMA-4 | PZMA-5 | PZMA-6 | PZMA-7 | |||||||||||
| 280 | 400 | 600 | 1000 | ||||||||||||
| Action | Spring range | Pneumatic cryogenic regulating valve Metal sealing allowable pressure difference (MPa) |
|||||||||||||
| Air open | 20-100KPa | 4.46 | 3.09 | 1.98 | 1.16 | 0.7 | 0.44 | 0.28 | 0.18 | 0.17 | 0.11 | 0.07 | 0.07 | 0.05 | 0.03 |
| 40-200 KPa | 6.4 | 6.4 | 5.94 | 3.34 | 2.14 | 1.31 | 0.84 | 0.53 | 0.51 | 0.33 | 0.21 | 0.22 | 0.15 | 0.09 | |
| 80-240 KPa | 6.4 | 6.4 | 6.4 | 6.4 | 4.99 | 3.05 | 1.95 | 1.25 | 1.18 | 0.78 | 0.5 | 0.51 | 0.36 | 0.21 | |
| Air close | 20-100KPa | 6.4 | 6.19 | 3.96 | 2.23 | 2.14 | 0.87 | 0.56 | 0.35 | 0.34 | 0.22 | 0.14 | 0.15 | 0.1 | 0.06 |
| 40-200 KPa | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 5.86 | 3.64 | 2.3 | 2.21 | 1.43 | 0.91 | 0.95 | 0.66 | 0.37 | |
| 80-240 KPa | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 5.04 | 3.18 | 3.06 | 1.98 | 1.26 | 1.32 | 0.92 | 0.52 | |
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