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Pneumatic diverging 3-way control valve


  • Port size:DN20~300, NPS 3/4〞~ 12〞
  • Pressure:PN16 ~ 100,150LB ~ 600LB
  • Medium:Water,oil,steam,gas
  • Temperature :-196~450℃
  • Body material:WCB LCB CF8 CF3 CF8M CF3M
  • Description:
  • Pneumatic diverging 3-way control valve Feature

    Pneumatic diverging 3-way control valve is diverging structure to devide one-way flowing fluid  into two-way fluid ,penumatic 3 way control valve has diverging and converging structure,3 way control valve adopts double valve cores up and down guide structure, equipped with multiple spring actuator.Pneumatic 3 way control valve can replace two sets two-way valve and widely used in many occasions to regulate pressure, flow rate, temperature and liquid level.
    Pneumatic diverging 3-way control valve body has the features as below:
    1.compact structure, light weight, sensitive action, low pressure drop loss, new high allowable pressure, large valve capacity, accurate flow characteristics and convenient maintenance, etc.,
    2.Pneumatic diverging 3-way control valve can be used for various working conditions, especially for the temperature control system of oil industry heat exchange and automatic control of other industries.
    3.Spool structure with side guiding, well stability, no vibration, low noisy, Pneumatic diverging 3-way control valve can bear high pressure difference, easy for connection.
    4.While with low nominal size and pressure difference, converging control valve can be used in diverging occasion. However, while nominal size higher than DN100 and high pressure difference, converging control valve and diverging control valve can’t be exchanged. 
  • Pneumatic diverging 3-way control valve specification

     Pneumatic 3-way control valve  Body type: 3-way casting globe type
    Spool type: 3-way double seat spool
    Nominal size: DN20~300 NPS 3/4〞~ 12〞
    Nominal pressure: PN16 ~ 100、 CLASS 150LB ~ 600LB
    Connection: flange: FF、RF、MF、RTJ
    Welding: SW、BW
    Flange dimension: According to to IEC 60534
    Pneumatic 3-way 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
    Control valve Actuator: Pneumatic:multi-spring diaphragm actuator, piston type actuator.
  • Pneumatic diverging 3-way control valve structure

  • Pneumatic diverging 3-way control valve material

    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
    Bellow 304,316,316L
    Gasket Normal:Stainless steel with flexible graphite,Special:Metal tooth type gasket
    Stem 2Cr13/17-4PH/304/316/316L
    Diaphragm Cover Normal:Q235,Special:304
    Diaphragm NBR with reinforced polyester fabric
    Spring Normal:60Si2Mn,Special:50CrVa
  • Pneumatic diverging 3-way control valve flow direction

  • Pneumatic diverging 3-way control valve type code

    Z Actuator H Structure Nominal size Body material Bonnet type Nominal pressure
    Z series control valve J:  pneumatic diaphragm

    H: pneumatic piston type
    R: electric 3810L type
    D: electric PSL type
    H: direct travel F: diverging type
    H: converging type
    D= special material
    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
    DN25= DN25
    NPS 1〞
    CL150LB=150 LB
    Such as: Pneumatic diaphragm diverging 3 way control valve, radiator type, pressure PN16, valve material WCB, nominal size DN50, type:  ZJHF-50CⅡ-16
  • Pneumatic diverging 3-way control valve performance

    3-way control valve Flow characteristic Linear, percentage
    Allowable range  30: 1
    Rated Cv value Percentage / linear CV8.5~1280
    Pneumatic 3-way control valve 
    Allowable leakage
    Metal seal:  IV grade(0.01% rated capacity)
    Leakage standard:  GB/T 4213
    Pneumatic 3-way 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 diverging 3-way control valve special requirment

    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
  • Pneumatic diverging 3-way control valve actuator parameter

    Pneumatic 3-way 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 3-way control valve
    E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch
    Non-standard accessories, need special customized notes.
  • Pneumatic diverging 3-way control valve technical parameter

    Seat diameter(mm) 25 32 40 50 65 80 100 125 150 200 250 300
    Rated flow coefficient, CV 8.5 13 21 34 53 85 135 210 340 535 800 1280
    Nominal size Travel Option flow coefficient Cv(★standard ●recommended)
    DN25 16 mm                      
    DN32 25 mm                      
    DN65 40mm                      
    DN125 60mm                      
    DN250 100mm                  
    Pneumatic actuator
    Diaphragm area, Ae (cm2)
    ZHA/B-23 ZHA/B-34 ZHA/B-45 ZHA/B-56
    350 560 900 1600
    Action Spring range pneumatic 3-way control valve
    Metal sealing allowable pressure difference(MPa)
    Air open 20-100KPa 0.7 0.44 0.28 0.18 0.17 0.11 0.07 0.07 0.05 0.03 0.05 0.03
    40-200 KPa 2.14 1.31 0.84 0.53 0.51 0.33 0.21 0.22 0.15 0.09 0.11 0.07
    80-240 KPa 4.99 3.05 1.95 1.25 1.18 0.78 0.5 0.51 0.36 0.21 0.21 0.15
    Air close 20-100KPa 2.14 0.87 0.56 0.35 0.34 0.22 0.14 0.15 0.1 0.06 0.05 0.03
    40-200 KPa 6.4 5.86 3.64 2.3 2.21 1.43 0.91 0.95 0.66 0.37 0.11 0.07
    80-240 KPa 6.4 6.4 5.04 3.18 3.06 1.98 1.26 1.32 0.92 0.52 0.21 0.15