FIG680 stainless steel three way and two way control valve
*All electronic electric actuators, adopting the structure, mechanical and electrical integration has machine servo operation
*opening position feedback signal, position indicator
*manual operation, powerful function, reliable performance, simple connection, high controlling accuracy
*Designed for frequent switch, control requirement of working conditions and design
*beautiful appearance, seal tightly don't leak, long service life
  • Technical parameter
  • Installation dimensions
  • Model description
  • Working Principle
  • Body 

    Size DN15~DN500mm
    Nominal pressure PN16~PN420,5K~63K,150LB~2500LB
    Applicable temperature -196~+650
    Applicable medium gas,water,oil,steam etc.
    Connection flange,SW
    Bonnet type Normal type ,High temperature type, Bellows type , Low temperature type
    Stuffing PTFE,Flexible graphite
    Seat PTFE
    Body material WCB,WC6,WC9,CF8,CF8M,CF3M etc


    Flow Characteristic quick-open, equal percentage, Linear


     Type Single spring diaphragm cylinder,multi-spring diaphragm cylinder,piston type/Double-acting cylinder,electric

  •  Model



     Valve type 


    CV3000 type


     forged steel sleeve type steam trap valve


     forged steel labyrinth control valve


     forged steel cascade throttle control valve


     2 ways control valve 


     3 ways control valve 


     3 ways bellows sealing control valve 


     slide valve



     single spring diaphragm type 


    multi-spring diaphragm type 


     single action piston 


    double action piston











     Open/Close type 

     air to open type


    air to close type


     electricity to open 


     electricity to close 

     Action type

     direct action





     without handwheel 


    top mount the handwheel


    Side mount the handwheel





     butt welding




    internal thread 


     external thread 


     wafer type



     Valve trim structure

     shut-off valve 


     sleeve single seat valve


    sleeve double seat valve


    porous type noise reduction cage


     labyrinth cage


    multistage depressurization type cage



     Valve core structure


    balanced internal parts


    unbalanced internal parts

     Valve bonnet type

     standard type 


    cooling fin type


     lengthen type


     bellow type


     clamp cover  type



     Flow characteristic

     quick opening




     equal percent


    fixed percentage

     Valve seat material




     alloy steel


     cemented carbide


     tungsten steel



     Norminal diameter



     Norminal pressure 







     Material type

























       1.CV3000 seriesMulti-spring diaphragm cylinder,air to open type,direct action,top mount the handwheel,sleeve single seat valve,balanced internal parts ,standard valve bonnet,equal percent type,RPTFE valve seat,norminal diameter DN50,norminal pressure PN25,CF8 material.

  •  Working principle of pneumatic control valve

    Pneumatic control valve drives itself by compressed air as power source , cylinder as actuator and with some attachments ,such as electric-pneumatic positionedconverter solenoid valvelock up valve and so on. It realizes the switch quantity or proportional adjustment, and receives the control signal of industrial automation control system to complete regulating the flow pressure temperature and other various process parameters of pipeline medium. Pneumatic control valve has characteristics of simple controlling, quick response, and intrinsically safe without additional explosion prevention measure.

    Pneumatic control valve’s actions are divided into Air to open type and Air to close type. Air to open type is that when the air pressure on membrane head increases, valve moves in the direction of opening increasing; until it reaches to input pressure limit, the valve is in the fully open position. In reverse, when the air pressure is reduced, valve moves in the direction of closing, when there is no input air, the valve is fully closed.

    So sometimes, Air to open type is also called Fail to Close/ FC type. Air to close type‘s movement direction is just the reverse of Air to open type. When the air pressure increases, valve moves in the direction of closing; when air pressure decreases or disappears, valve moves in the direction of opening or until fully open. So sometimes it’s called Fail to Open /FO. Pneumatic control valve belongs to which type is according to positive and negative effects of the actuator and different assemble ways of valve structure.

    Choosing Air to open or Air to close is according to safety perspective of the process of production. When cut off the air source, in the closed position or open position control valve is safe?

    For example, a heating furnace combustion control, the control valve is installed in the fuel pipe, according to the temperature of furnace or the heated material in furnace exit to control the supply of fuel. At this time, Air to open type valve is safer, because once stop the air supply, It’s more suitable in closed position than in fully open position for valve.

    If air supply is cut off, fuel valve is fully open, risk will appear because of excessive heating. And such as a cooling heat-exchange equipment with cooling water, hot material in the heat exchanger are cooled when having heat exchange with cooling water, control valve is installed on the cooling water pipe, temperature of heat exchanged materials is used to control the cooling water’s volume, when the air supply is cut off, control valve in open position is more safe, Air to close type is appropriate.

    Valve positioner is the main accessory of control valve, it accepts the regulator output signal, and then controls the pneumatic control valve by its output signal, when control valve moves, the displacement of valve stem feedback to valve positioner through mechanical device, valve position condition will be sent o the upper system through the electrical signal .

    According to valve positioner structure and working principle ,it can be divided into pneumatic valve positioner, electric-pneumatic valve positioner and smart valve positioner.

          Valve positioner can increase the output power of control valve, reduce the transmission lag of control signal, speed up movement of valve stem, improve the linearity of valve, overcome the friction of valve stem and eliminate the influence of unbalanced force, so as to ensure positioning rightly.

    valve positioner

          Actuator has pneumatic actuator, electric actuator, straight stroke and stroke.