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Address: NO.720, Suide Road, Jiading District,Shanghai, China.

Pneumatic diaphragm control valve


  • Port size:DN15~200, NPS 1/2〞~ 8〞
  • Pressure:PN10 ~ PN16、 CLASS 150LB
  • Medium:Weak acid,alkali,etc.
  • Temperature :-29~150℃
  • Body material:WCB,304SS,316SS
  • Description:
  • Pneumatic diaphragm control valve Feature

    Pneumatic diaphragm control valve has simple structure, small flow resistance, larger flow capacity than other control valves of the same caliber, no leakage, and Pneumatic diaphragm control valve can be used for the regulation of high viscosity and suspended particle fluid. Pneumatic diaphragm control valve is suitable for the regulation of strong alkali and corrosive media according to the different diaphragm materials (rubber NR,NBR,EPDM or Plastic PTFE,PFA,FEP ).Pneumatic diaphragm control valve is composed of diaphragm valve and pneumatic film actuator.
    Pneumatic diaphragm control valve feature as below:
    1 Pneumatic diaphragm control valve is with light actuator, the height and weight can be reduced by 30%.
    2 The inner surface of the Pneumatic diaphragm control valve body is covered with a various materials to avoid direct contact with the medium and withstand the corrosion of the corrosive medium.
    3 When the Pneumatic diaphragm control valve is closed, the leakage is zero, which is especially suitable for the highly toxic medium.
    4 The flow path of Pneumatic diaphragm control valve is simple, the resistance is small, the rated flow coefficient ratio is bigger than single seat,cage guided control valve with the same caliber.

  • Pneumatic diaphragm control valve Specification 

    control valve Body type: Diaphragm valve
    Nominal size: DN15~200 NPS 1/2〞~ 8〞
    Nominal pressure: PN10 ~ PN16、 CLASS 150LB
    Connection: flange: FF、RF
    Flange dimension: According to to JB/T13927 ANSI B16.5 Class150
    Bonnet type: Ⅰ:standard type(-29℃~150℃)
    Packing: V type PFTE packing, flex. graphite packing, etc.
    Gasket: Metal graphite packing
    Actuator: Pneumatic:multi-spring diaphragm actuator, piston type actuator.
  • Pneumatic diaphragm control valve structure

  • Pneumatic diaphragm control valve valvematerial

    Component name Diaphragm Control Valve Material
    Body/Bonnet WCB/CF8/CF8M
    Bonnet WCB/CF8/CF8M
    Diaphragm Rubber :Nature rubber ,NBR,EPDM or Plastic:PTFE,PFA,FEP )
    Liner Normal::Nature rubber ,others:NBR,EPDM,PTFE,PFA,FEP
    Diaphragm Cover Normal:Q235,Special:304
    Actuator Diaphragm NBR with reinforced polyester fabric
    Spring Normal:60Si2Mn,Special:50CrVa
    Control valve stem 2Cr13/17-4PH/304/316/316L
  • Pneumatic diaphragm control valve performance

     Pneumatic diaphragm control valve Flow characteristic Approximately quick open
    Allowable range 30: 1
    Rated Cv value Percentage CV6.3~400 ,linear CV6.9~440
    Pneumatic diaphragm control valve
    Allowable leakage
    Soft seal:  VI grade(foam grade)
    Leakage standard:  GB/T 4213
    Pneumatic diaphragm 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
  • Pneumatic diaphragm control valve actuator parameter

    Pneumatic diaphragm control valve
    Type\ Method
    Pneumatic diaphragm actuator
    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 diaphragm control valve Accessories E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch
    Non-standard accessories, need special customized notes.

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