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Pneumatic Three-Piece Ball Valve

Keywords: metering pump accessories


Pneumatic ball valve

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    Pneumatic three-piece ball valve parts materials:

    Left and right: Valve body WCB, CF8, CF8M, CF3M

    Valve seat: PEFE, PPL, 304, 316

    Sphere: WCB, CF8, CF8M, CF3M

    Seal: PTFE, metal hard seal

    Medium body: WCB, CF8, CF8M, CF3M

    Valve stem: 2Cr13304, 316, 316L

    Packing gland: WCB, CF8, CF8M, CF3M

    Optional accessories: limit switch, positioner, solenoid valve, pressure reducing valve


    Technical parameters of pneumatic three-piece ball valve:

    Nominal diameter


    Nominal pressure


    Connection method

    internal thread

    Air drive

    Compressed air 4-6bar (can be equipped with handwheel)

    temperature range

    Soft seal: -30~180℃; Hard seal: -40~425℃

    Valve body structure

    Three-piece ball valve (opening optional)

    Sealing material

    Polytetrafluoroethylene (F), para-polystyrene (PPL), metal hard seal (H)

    Applicable media

    Gas, liquid, oil, corrosive media, etc.

    Valve body material

    Switch mode (two-position switch control), regulating type (4-20mA signal)


    The difference between three-piece ball valve and one-piece and two-piece ball valve :

     The one-piece ball valve is one-piece, with a plug holding the ball in place. It is an integral valve body and is often used in small-sized valves.

    The two-piece ball valve is composed of two parts. The ball is clamped and fixed by the two valve bodies. Maintenance is relatively complicated. The tightness of the screw in the middle is very critical, which is related to the possibility of leakage.

    The three-piece ball valve consists of two left and right valve bodies and a middle valve body, which are clamped by neck flanges on both sides. Its pressure is higher than that of the other two types of ball valves.

    Under normal circumstances, inner wire ball valves are mostly one-piece or three-piece, while three-piece ball valves are generally precision cast valves, and two-piece ball valves are mostly used for flange valves.