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PTFE lined pneumatic control valve


  • Port size:DN20~150, NPS 3/4〞~ 6〞
  • Pressure:PN16 ~ 25 CLASS 150/300LB
  • Medium:Corrosive medium
  • Temperature :-20~150℃
  • Body material:WCB,304SS,316SS+FEP/PTFE/PFA
  • Description:
  • PTFE lined pneumatic control valve Feature

    PTFE lined pneumatic control valve is composed of pneumatic diaphragm actuator,straight through single seat PTFE (PTFE,FEP,PFA is optional) Lined structure.PTFE lined pneumatic control valve contacted with the corrosive medium adopts the corrosion-resistant, anti-aging PTFE, the high pressure lining fluorine plastic process.PTFE lined pneumatic control valve is capable of controlling the flow of acid, alkali, aqua wang and other highly corrosive media, toxic volatile gas and liquid media.Therefore, PTFE lined pneumatic control valve is widely used in chemical, metallurgy, medicine and other industries.
    PTFE lined pneumatic control valve features as below:
    1. Good corrosion resistance: the inner cavity of  PTFE lined pneumatic control valve body, core, seat are lined with 3mm thick PTFE  (PTFE,PEP,PRA is optional) , which can withstand strong corrosive fluid.
    2. Good sealing performance: double sealing with PTFE bellows and packing.
    3. The leakage quantity is little, because the PTFE lined pneumatic control valve core and seat are soft seal, leakage was far below the national Ⅳ level standard.
    4. High adjustment accuracy: PTFE lined pneumatic control valve adopts precise and small pneumatic and electric actuators, small in size and light in weight.

  • PTFE lined pneumatic control valve Specification 

    PTFE lined pneumatic control valve
    Body type:
    straight through casting globe type
    PTFE lined (PTFE,FEP,PFA is optional) 
    Spool 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
    PTFE lined pneumatic control valve 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.
  • PTFE lined pneumatic control valve structure

  • PTFE lined pneumatic control valve material

    Component name Control Valve Material
    Body/Bonnet WCB/CF8/CF8M/CF3M
    Lined Material PTFE(PTFE,FEP,PFA is optional) 
    Control Valve spool/Seat 304/316/316L Lined PTFE/FEP/PFA
    Packing PTFE
    Gasket PTFE
    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
  • PTFE lined pneumatic control valve performance

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

    PTFE lined pneumatic 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℃
    PTFE lined pneumatic control valve
    E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch
    Non-standard accessories, need special customized notes.
  • PTFE lined pneumatic control valve technical parameter

    Nominal size, DN 20 25 32 40 50 65 80 100 125 150
    Rated flow coefficient, Cv Percentage   8 12 20 32 50 70 100 200 240
    Linear 5 10 16 25 38 63 80 120 220 300
    Travel 16mm 25 mm 40mm 60mm
    Pneumatic actuator
    Diaphragm effective area, Ae (cm2)
    ZHA/B-22 ZHA/B-23 ZHA/B-34 ZHA/B-45
    350 350 560 900
    Action Spring range PTFE lined pneumatic control valve
    Max. allowable pressure difference(MPa)
    Air open 20-100KPa 1.16 0.7 0.44 0.28 0.18 0.17 0.11 0.07 0.07 0.05
    40-200 KPa 3.34 2.14 1.31 0.84 0.53 0.51 0.33 0.21 0.22 0.15
    80-240 KPa 6.4 4.99 3.05 1.95 1.25 1.18 0.78 0.5 0.51 0.36
    Air close 20-100KPa 2.23 2.14 0.87 0.56 0.35 0.34 0.22 0.14 0.15 0.1
    40-200 KPa 6.4 6.4 5.86 3.64 2.3 2.21 1.43 0.91 0.95 0.66
    80-240 KPa 6.4 6.4 6.4 5.04 3.18 3.06 1.98 1.26 1.32 0.92

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