linear bearings

Ball valve installation and maintenance

by:AIRWOLF     2020-05-24
A, the installation of ball valve before installation pipeline before and after the preparation of 1, the ball valve has been ready. Before and after the pipe shall be concentric, two flange sealing surface should be parallel. Pipe should be able to bear the weight of the ball valve, otherwise the line must be equipped with the appropriate support sweep 2, blow the pipeline before and after the valve, remove oil pipe, welding slag, and all other impurities 3, a sign of check valve, ball valve is in good condition. The valve fully open full closed several times to confirm they work 4, down on the ball valve on both ends of the connecting flange protection unit 5, check valve hole clearance may have dirt, and then clean the valve hole. Between the seat and the ball even if only small particles of foreign matter may damage the valve seat sealing surface 1 installation, the valve is installed on the pipeline. Any end of the valve can be installed at the upstream end. Valve can be installed on the pipeline driven by the handle. But with a gear box or pneumatic actuator ball valve should be installed upright, is installed in a horizontal pipe, and drive in the pipeline between the above 2, valve, flange and pipe flange mount gasket 3 according to the requirements of pipeline design, flange bolts need to be symmetrical, successive, uniform tight 4, pneumatic pipeline connection ( Using pneumatic drive) After installation check 1, drive valve opening and closing operation several times, should be no sluggish acerbity, confirmed that they work 2, according to the requirements of pipeline design of pipeline and ball valve sealing performance examination of the flange joint surface of between 2 pieces, the ball valve maintenance must first find out on the ball valve, the downstream piping have indeed after unloading the pressure, to decomposition of dismantling operations in pieces and then assembled sealing surface of the parts, must be careful to prevent injury when non-metallic parts, especially take out the o-rings inappropriate use of special tools mixer assembly when the flange bolts on pieces must be symmetrical, gradually and evenly tighten the cleaner should be with the rubber ball valve parts, plastic parts, metal parts and working medium ( For example, gas) Are incompatible. Working medium is gas, can use gasoline ( GB484 - 89). Clean the metal parts. Non-metallic parts pieces clean with clean water or alcohol decomposition down the single parts can use dip way to clean. Still left did not break down the non-metallic metal parts can be fine clean clean immersion cleaner silk ( In order to avoid fall off fiber adhesion on the parts) Scrub. When cleaning should remove all adhesion on the surface of grease, dirt, product plastic pieces, dust and other non-metallic parts shall be immediately removed from the cleaning agent, after cleaning pieces may not soak for a long time after cleaning after wash wall cleaning agent to volatilize and ( Available not soak cleaner silk cloth to wipe) Are assembled, but shall not be shelved for a long time, or it will rust and dust pollution in pieces in the new parts before assembly pieces need to be cleaned using grease lubrication. Grease and ball valve should be metal material, rubber parts, plastic parts and working medium are incompatible. Working medium is gas, available for example 221 grease. Besmear in seal installation groove on the surface of a thin layer of grease, apply a thin layer of grease on the rubber seal, valve stem seal face and friction surface coated with a thin layer of grease mixer assembly time should not be allowed to have metal scraps, fiber and fat ( With the provisions of the exception) Dust and other impurities, foreign bodies, such as pollution, adhesion, or stay on the parts surface or into the lumen
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