Article 15 the points for attention during the pneumatic ball valve repair 3)

（ ） Must first determine the upstream and downstream piping pressure pneumatic valve, is only in the demolition work breakdown. （ ） Decomposition and reassemble the parts have to be careful to prevent damage the sealing surface, especially the nonmetallic parts, remove the o-ring, special tools should be used.
( ） Flange assembly bolts must be symmetrical and uniform gradually tighten.
( ） Pneumatic valve cleaning agents should be in rubber parts, plastic parts, hardware and working medium ( Such as gas) So compatible. Working medium for gas, gasoline, GB - ） Clean the metal parts. Non-metallic parts cleaning with water or alcohol.
( ） Break down each part, but through cleaning soaking method. Not from the decomposition of non-metallic parts can be used to clean metal small part with cleaner impregnated silk ( To prevent the loss of part of the fiber adhesion) Scrub. Cleaning, remove oil, dirt, rubber, dirt and other material from the adhesive on the wall.
( ） Non-metallic parts shall be immediately deleted from the cleaning agent, after cleaning not soak for a long time.
( ） Volatile after all things after cleaning cleaning detergent ( Dip in detergent can not rub silk) Assembly, but not a long time, walls, or it will rust and dust pollution.
( ） And then also need clean water in new assembly parts.
( ） Grease lubrication is used. Grease should be a metal ball, rubber parts, plastic parts and working medium compatibility. Working gas and can be used for medium, such as special grease. With a pair of rubber seal with a thin layer of grease surface coated with a thin layer of grease groove seal installation, pneumatic valve stem seal face and friction surface coated with a thin layer of grease.
( ） Congress should not let the metal debris, fiber, fat, In addition to the provisions) Dust and other impurities, foreign body contamination, or enter a cavity adhesion or stay in workpiece surface.