info@shxvalve.cominfo@shxvalve.com
Tel:+86-17717520739
Email：info@shxvalve.com
Address: NO.720, Suide Road, Jiading District,Shanghai, China.
Model：HLS
Low flow pneumatic control valve is designed for micro flow medium .The compact body ofLow flow pneumatic control valve has an S-shape flow passage that features low pressure loss, allows a large flowcapacity,rangeability, and high accuracy flow characteristics.
Low flow pneumatic control valve plugs are available in wide range of Cv values. The flow shut-off performance complies with the IEC or JIS standards. The actuator integrated with simplest mechanisms utilizes a compact yet powerful diaphragm actuator leaded with multiple springs.
Low flow pneumatic control valve is widely applicable for reliable control of small flows in high or low temperature, high pressure process lines.
| Pneumatic control valve Body type: |
straight through casting globe type |
| Spool type: | non-balanced single seat plug type |
| Nominal size: | DN15~25,、 NPS 1/2〞~ 1〞 |
| Nominal pressure: | PN16 ~ 100、 CLASS 150LB ~ 600LB |
| Connection: flange: | FF、RF、MF、RTJ |
| Welding: | SW、BW |
| Flange dimension: | According to to IEC 60534 |
| Low flow pneumatic 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 |
| Packing: | V type PFTE packing, flex. graphite packing, etc. |
| Gasket: | Metal graphite packing |
| Pneumatic control valve actuator: | Pneumatic: multi-spring diaphragm actuator, piston type actuator. |
| Component name | Control Valve Material |
| Body/Bonnet | WCB/WCC/WC6/CF8/CF8M/CF3M |
| Valve spool/Seat | 304/316/316L(overlaying stellite alloy) |
| Packing | Normal:-196～150℃ is PTFE,RTFE,>230℃ is flexible graphite |
| 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 |
| Low flow pneumatic control valve Flow characteristic |
Linear, percentage, quick open | |
| Allowable range | 30: 1 | |
| Rated Cv value | CV 0.01-1.0 | |
| Pneumatic control valve Allowable leakage | Metal seal: IV grade（0.01% rated capacity） Leakage standard: GB/T 4213 |
|
| Pnuematic micro flow control 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 | |
| Special test | Material penetration flaw detection (PT), radiator test (RT), flow characteristic test, low temperature test. |
| Special treatment | Trim nitrogen treatment, seat hard alloy treatment. |
| Special rinse | Degreasing and dehydration treatment |
| Special condition | Special piping or connection, vacuum condition, S.S fastener, special coating. |
| Special dimension | Customized face to face length or dimension |
| Test and inspection | Third party test report |
| Control Valve Type\ Method | Pneumatic diaphragm actuator |
| ZHA/B-22 | |
| 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 control valve Accessories |
E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch Non-standard accessories, need special customized notes. |
| Rated flow coefficient Cv | Equal percentage | 0.25 | 0.1 | 0.4 | 0.63 | 1.0 | ||||
| Linear | 0.01 | 0.04 | 0.1 | 0.16 | 0.25 | 0.1 | 0.4 | 0.63 | 1.0 | |
| DN | Travel | Option flow coefficient Cv（★ standard ●recommended ○customized） | ||||||||
| DN15 | 16mm | ● | ● | ● | ● | ● | ● | ★ | ★ | ★ |
| DN20 | ● | ● | ● | ● | ● | ● | ★ | ★ | ★ | |
| DN25 | ● | ● | ● | ● | ● | ● | ★ | ★ | ★ | |
| Pneumatic actuator | ZHA/B-22 | |||||||||
| Pneumatic diaphragm effective area, Ae (cm2) | 350 |
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