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Be careful to prevent damage to the sealing surface of the part

- May 29, 2018 -

What are the maintenance methods for threaded ball valves? What about thread maintenance?

(1) It must be ascertained that the pressure on the upper and lower pipelines of the ball valve has been removed before the decomposing operation can be performed.

(2) When disassembling and reassembling, care must be taken to prevent damage to the sealing surfaces of parts, especially non-metallic parts. Special tools should be used when removing O-rings.

(3) The bolts on the ball valve flange must be tightened symmetrically, gradually and evenly during assembly.

(4) The cleaning agent should be compatible with the rubber parts, plastic parts, metal parts and working media (such as gas) in the ball valve. When the working medium is gas, metal parts can be cleaned with gasoline (GB484-89). Non-metallic parts are cleaned with pure water or alcohol.

(5) The individual parts of the ball valve can be washed by dipping. Metal parts that still have undecomposed non-metallic parts can be cleaned with a clean, finely-cleaned silk cloth impregnated with detergent (to prevent the fibers from sticking to the parts). When cleaning

Remove any grease, dirt, glue, dust, etc. that adhere to the wall.

(6) The non-metallic parts of the ball valve should be removed from the cleaning agent immediately after cleaning, and must not be soaked for a long time.

(7) After cleaning, the wall surface cleaning agent should be volatilized (when it can be wiped with a silk cloth not immersed in cleaning agent), but it must not be left for a long time, otherwise it will rust and be contaminated by dust.

(8) The new ball valve parts must also be cleaned before assembly.

(9) Lubricate with grease. Grease should be compatible with ball valve metal materials, rubber parts, plastic parts and working media. When the working medium is gas, for example, special grease 221 can be used. Apply a thin layer of grease to the surface of the seal mounting groove.

A thin layer of grease is applied to the rubber seal and a thin layer of grease is applied to the sealing and friction surfaces of the stem.

(10) Ball valves should not be allowed to be contaminated with metal scraps, fibers, grease (except for the specified use), dust and other impurities, foreign matter, etc., adhere or stay on the surface of the parts or enter the internal cavity.


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