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( 1 ) must be identified on the ball , the pressure downstream of the pipeline has indeed dropped to decompose demolition operations .

( 2 ) non-metallic parts after cleaning should be immediately removed from the cleaning agent , not a long soak.

( 3 ) When mounting bolts on the flange must be symmetrical, gradually , evenly tightened.

( 4 ) cleaning agent should be compatible with the ball in the rubber parts, plastic parts, metal parts and the working medium ( such as gas ) and others . Working medium for the gas used gasoline (GB484-89) to clean metal parts. Non-metallic parts cleaning with pure water or alcohol.

( 5 ) decomposition down every single ball valve parts can be cleaned by immersion methods . Still left down decomposition of non-metallic parts clean metal parts can be impregnated with fine silk cleaning cleaning agents are ( in order to avoid shedding fibers adhere to the parts ) scrub. Must remove all the adhesive on the wall of grease, dirt, rubber , dust cleaning .

( 6 ) Ball decompose and must be carefully sealed to prevent surface damage when re- assembling the parts , especially the non-metallic parts , remove the O -ring should use special tools .

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

( 8 ) new parts before assembly also need to be cleaned .

( 9 ) with grease lubrication. Grease should be compatible with the ball are metal, rubber parts, plastic parts and the working medium . Working medium for the gas , can be used such as 221 special grease . Coated on the surface of the seal member mounting groove of a thin layer of grease , a thin layer of grease applied to the rubber seal , valve stem seal surface and the friction surfaces coated with a thin layer of grease.

( 10 ) assembly should not allow metal debris , fibers, oils ( other than the requirement to use ) dust and other impurities , foreign matter contamination , or remain on the adhesive surface of the part or into the lumen .