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A216 WCB Cast Steel Trunnion Mounted Ball Valve

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A216 WCB Cast Steel Trunnion Mounted Ball Valve

During the operation of the trunnion mounted ball valve, all the force generated by fluid pressure on the ball is transmitted to the bearing, which will not cause the ball to move towards the valve seat, and the valve seat will not bear excessive pressure. Fixed ball valves have low torque, small seat deformation, stable sealing performance, and long service life. Both large-diameter and high-pressure ball valves will be designed as fixed structures.

    The seat component of the fixed ball valve has self tightening characteristics, which can achieve upstream sealing. Both seats of the valve can be sealed, so there is no flow restriction during installation and it is bidirectional.
    There are two types of valve body structures for fixed ball valves: two piece and three piece. The middle flange is connected by bolts, and the seal is made of reinforced polytetrafluoroethylene embedded in the stainless steel ring. There is a spring at the back of the steel ring to ensure that the valve seat is tightly against the ball, maintaining a seal. Both the upper and lower valve stems are equipped with PTFE bearings to reduce friction and save operation. The bottom of the small shaft is equipped with adjustment plates to ensure the position of the ball and sealing ring at the joint. Full bore: The valve flow aperture is consistent with the inner diameter of the pipeline for pipeline cleaning.


    - Size from 2” to 24” ( DN50mm to DN600mm).
    - Pressure ratings from Class 150LB to 2500LB ( PN10 to PN142).
    - Full bore or reduced bore.
    - Soft sealed or metal sealed.
    - RF, RTJ or BW end.
    - The driving mode can be manual, electric, pneumatic.


    Design Standard: API 608, API 6D, ASME B16.34
    Flange Diameter Standard: ASME B16.5, ASME B16.47, ASME B16.25
    Face-to-face Standard: API 6D, ASME B16.10
    Pressure Test Standard: API 598

    Additional Features

    Performance advantages of cast steel trunnion mounted ball valves from BOLON.

    1. Low torque operation
    The sphere is supported by upper and lower bearings, reducing friction and eliminating excessive torque caused by the huge sealing load formed by the inlet pressure pushing the sphere and the sealing seat.

    2. Reliable sealing performance
    The PTFE single material sealing ring is embedded in the stainless steel valve seat, and a spring is installed at the end of the metal valve seat to ensure sufficient pre tightening force of the sealing ring. When the sealing surface of the valve is worn during use, the valve continues to ensure good sealing performance under the action of the spring.

    3. Fireproof structure
    In order to prevent the occurrence of sudden heat or fire, which may cause the PTFE sealing ring to burn out and cause significant leakage, and promote the fire, a fireproof sealing ring is installed between the sphere and the valve seat. When the sealing ring is burned out, under the action of spring force, the valve seat sealing ring is quickly pushed onto the sphere, forming a metal to metal seal and achieving a certain degree of sealing effect. The fire resistance test meets the requirements of APl6FA and APl607 standards.

    4. Automatic pressure relief function
    When the pressure of the stagnant medium in the valve chamber abnormally increases beyond the pre force of the spring, the valve seat will retract and detach from the sphere, achieving the effect of automatic pressure relief. After pressure relief, the valve seat will automatically recover

    5. The function of cleaning pipelines
    Drain holes are installed on both sides of the valve body to check for leaks in the valve seat. During operation, when the valve is fully open or fully closed, the pressure in the middle chamber can be removed and the packing can be directly replaced; It can discharge residual substances in the middle chamber and reduce the pollution of the medium on the valve.

    6. Sealing emergency grease injection rescue
    Due to foreign objects in the medium or fire causing accidental failure of the valve seat seal, the grease valve provides a quick connection with the grease gun, and the imported pump conveniently and quickly injects sealing grease into the valve seat sealing area to alleviate leakage.

    7. Reliable valve stem seal and low operating torque
    In addition to setting standard sealing rings, O-ring seals are also installed on the packing gland, ensuring the reliability of the valve stem seal with dual sealing; The addition of graphite packing and sealing grease injection minimizes valve stem leakage after a fire. The sliding bearings and thrust bearings of the valve stem make the operation of the valve easy.

    8. Full bore or reduced bore
    Full bore or reduced bore structures can be selected as needed. The flow aperture of the full bore valve is consistent with the inner diameter of the pipeline, making it easy to clean the pipeline.

    9. The valve stem can be extended
    According to installation or operation requirements, the valve stem can be extended. Extended rod ball valve, especially suitable for urban gas and other occasions that require buried pipeline laying. The size of the extended valve stem shall be determined according to customer needs.

    10. Flexible operation
    The use of seat and stem bearings with small friction coefficient and good self-lubricating properties greatly reduces the operating torque of the valve. Therefore, even without providing sealing grease, the valve can be operated flexibly and freely for a long time.

    Materials of Main Components

    NO. Part Names Material
    1 Body A216 WCB
    2 Bolt A193 B7
    3 Nut A194 2H
    4 Bonnet A216 WCB
    5 Gasket S.S+Graphite
    6 Shaft A105
    7 O-ring VITON
    8 Seat A105
    9 Seat Insert PTFE
    10 Ball A105+ENP
    11 Block A105
    12 Spring S.S
    13 Gasket Graphite
    14 Bearing PTFE
    15 Stem A276 420
    16 O-ring VITON
    17 Inject Plug C.X
    18 Stuff Box A105
    19 Packing Graphite
    20 Gland Flange Plate A216 WCB


    Cast Steel A216 WCB trunnion mounted ball valves are suitable for cutting off or connecting media in pipelines, and can be used for conveying water, steam, oil, nitric acid, acetic acid, oxidizing media, urea, etc. They are widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electricity, municipal engineering, steel and other fields.