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Pneumatic on off control valve Body type: |
straight through casting globe type |
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Spool type: |
non-balanced type or balanced type |
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Nominal size: |
DN20~200,、 NPS 3/4〞~ 8〞 |
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Nominal pressure: |
PN16 ~ 100、 CLASS 150LB ~ 600LB |
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Connection: flange: |
FF、RF、MF、RTJ |
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Welding: |
SW、BW |
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Flange dimension: |
According to to IEC 60534 |
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Pneumatic On Off control valve Bonnet type: |
Ⅰ:standard type（-20℃~230℃） Ⅱ:Radiator type: （-45℃~ high than 230℃ occasion） Ⅲ:Low temperature extended type（-196℃~ -45℃） Ⅳ:Bellow seal type Ⅴ:Warm insulation Jacket type |
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Packing: |
V type PFTE packing, flex. graphite packing, etc. |
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Gasket: |
Metal graphite packing |
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Actuator: |
Pneumatic: multi-spring diaphragm actuator, piston type actuator. |
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Component name |
Control Valve Material |
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Body/Bonnet |
WCB/WCC/WC6/CF8/CF8M/CF3M |
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Valve spool/Seat |
304/316/316L(overlaying stellite alloy) |
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Packing |
Normal:-196～150℃ is PTFE,RTFE,>230℃ is flexible graphite |
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Gasket |
Normal:Stainless steel with flexible graphite,Special:Metal tooth type gasket |
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Diaphragm Cover |
Normal:Q235,Special:304 |
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Diaphragm |
NBR with reinforced polyester fabric |
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Spring |
Normal:60Si2Mn,Special:50CrVa |
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Control valve stem |
2Cr13/17-4PH/304/316/316L |
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Pneumatic single seat control valve Flow characteristic |
quick open |
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Allowable range |
50: 1 (CV<6.3 30: 1) |
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Rated Cv value |
Percentage CV1.6~630 ，linear CV1.8~690 |
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Pneumatic control valve Allowable leakage |
Metal seal: IV grade（0.01% rated capacity） Soft seal: VI grade（foam grade） Leakage standard: GB/T 4213 |
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Pneumatic On Off Control Valve Performance |
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Intrinsic error % |
±1.5 |
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Return difference, % |
≤1.5 |
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Dead zone, % |
≤0.6 |
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Difference from beginning to end point, % |
±2.5 |
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Rated travel difference, % |
≤2.5 |
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