Trunnion Mounted Ball Valve Repair Procedures And Precautions Step Instructions

Trunnion mounted ball valve in the closed state, the internal body fluid under pressure is still there, before servicing and relieve line pressure valve in the open position.


1) The first trunnion mounted ball valve repair, disconnect the power or gas source, and the bracket from the actuator.

2) The new parts in the assembly need clean water, non-metallic parts should be cleaned immediately after removal from the cleaning agent, not a long soak.

3) After cleaning the wall needed to be to be washed after volatile cleaning agent (not soaked cleaning agent available silk rub) for assembly, but not for a long time on hold, otherwise it will rust, dust pollution.

4) We must first identify the trunnion mounted ball valve, after removing the pressure downstream pipeline has indeed to be demolished decomposition operation.

5) Care must be taken to prevent damage to the sealing surface of decomposition and re-assembly of the parts, especially when the non-metallic parts, O-rings should be taken when using special tools.

6) Using grease lubrication, grease should be compatible with both fixed ball of metal materials, rubber parts, plastic parts and the working medium, the working medium for the gas, can be used such as 221 special grease. Coated on the surface of the seal mounting groove of a thin layer of grease, spread a thin layer of grease on the rubber seals, valve stem sealing surface and the friction surface coated with a thin layer of grease.

7) Trunnion mounted ball valve assembly bolts on the flange must be symmetrical, gradually and evenly tightened.

8) Cleaning agents should be compatible with fixed ball in the rubber parts, plastic parts, metal parts and the working medium (such as gas) are working medium for the gas, available gasoline (API6D) to clean metal parts, non-metallic parts washed with pure water or alcohol.

9) Trunnion mounted ball valve down decomposition individual parts can dip way to clean, yet left down decomposition of non-metallic parts may be clean metal parts are impregnated with fine clean silk cleaning agents (to avoid fiber loss Adhesion On the part) scrub. It shall be attached to the wall to remove all grease, dirt, rubber, dust and so on.


Should you want to know more about ball valve from Reliable China valve manufacturer, please visit or email us via


Contact Us


Zhejiang Relia Valve Co., Ltd.

Sanqiao Ind. Zone, Oubei Town

Wenzhou, Zhejiang, 325105



Tel: + 86-577-86373155

Fax: + 86-577-56994545



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