Structural Characteristics & Materials of Metal-seated Trunnion Ball Valves
A metal seated trunnion ball valve is a new generation of high-performance ball valves, which is suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and resistance to harsh environments have been specially considered in the design, and it is suitable for various corrosive and non-corrosive media. The metal seated trunnion ball valve has small torque, small seat deformation, stable sealing performance and long service life. It is suitable for high pressure, high temperature and occasions with particles.
Structural Characteristics of metal seated trunnion ball valves
1. Double blocking and discharge: the trunnion ball valve adopts the spring pre-tightened floating valve seat, no matter the valve is in the fully open or fully closed state, the valve seat on the upstream and downstream sides will block the fluid, and the entrapment in the cavity of the valve body will be discharged through the discharge valve.
2. Automatic pressure relief: When the temperature of the medium in the body cavity of the valve rises to cause an abnormal pressure increase, it does not need to pass through the safety valve, but only rely on the function of the valve seat to automatically release the pressure, which is very important to ensure the safety of the valve when transporting liquid media.
3. Fire safety structure: trunnion ball valves have fire safety functions, and their design and manufacture follow the requirements of API 607 and API 6FA.
4. Reliable valve stem seal and low operating torque: In addition to the standard seal ring, the packing gland is also equipped with an O ring, and the double sealing ensures the reliability of the valve stem.
5. Full bore or reduced bore: Full bore or reduced bore structure can be selected according to needs. The flow aperture of the full-bore valve is consistent with the inner diameter of the pipeline, which is convenient for pipeline cleaning.
Common materials for valve bodies
The commonly used materials for the valve body of the metal seated trunnion ball valve are generally WCB, CF8, CF8M, CF3, CF3M, C9, C5, C12, 310S and Monel. Hard-seated ball valve seats can be made from carbon steel or stainless steel, carbon steel substrate surfacing stainless steel or stainless steel substrate surfacing hard alloys.
Structural Characteristics of metal seated trunnion ball valves
1. Double blocking and discharge: the trunnion ball valve adopts the spring pre-tightened floating valve seat, no matter the valve is in the fully open or fully closed state, the valve seat on the upstream and downstream sides will block the fluid, and the entrapment in the cavity of the valve body will be discharged through the discharge valve.
2. Automatic pressure relief: When the temperature of the medium in the body cavity of the valve rises to cause an abnormal pressure increase, it does not need to pass through the safety valve, but only rely on the function of the valve seat to automatically release the pressure, which is very important to ensure the safety of the valve when transporting liquid media.
3. Fire safety structure: trunnion ball valves have fire safety functions, and their design and manufacture follow the requirements of API 607 and API 6FA.
4. Reliable valve stem seal and low operating torque: In addition to the standard seal ring, the packing gland is also equipped with an O ring, and the double sealing ensures the reliability of the valve stem.
5. Full bore or reduced bore: Full bore or reduced bore structure can be selected according to needs. The flow aperture of the full-bore valve is consistent with the inner diameter of the pipeline, which is convenient for pipeline cleaning.
Common materials for valve bodies
The commonly used materials for the valve body of the metal seated trunnion ball valve are generally WCB, CF8, CF8M, CF3, CF3M, C9, C5, C12, 310S and Monel. Hard-seated ball valve seats can be made from carbon steel or stainless steel, carbon steel substrate surfacing stainless steel or stainless steel substrate surfacing hard alloys.
