Thread ball valve of the closure is a ball, ball valve is usually a small ball valve, the ball around the center line of the body as a rotation to achieve a kind of open and close the valve. Threaded ball valve in the line is mainly used for cutting, distribution, and change the flow direction of medium. Two type ball valve, three type ball Industrial Valves, is widely used in recent years a new type of valve, the valve average installation. And ball valve is a kind of ball valves, threaded pipe connection is screwed connection, and flanged ball valves, welded ball valve, etc. Threaded ball valve installation note: 1, the installation location, altitude, import and export direction must comply with the design requirements, threaded connections shall be firmly. 2, all kinds of manual valves installed on the thermal insulation pipe, handle shall not down. 3, a visual inspection must be conducted before installation of valve, the valve nameplate should comply with the national standard 'general valve symbol' now GB12220 rules. For the working pressure is greater than 1. 0 mpa and in ZhuGanGuan valve with the function of cutting off the road, before installation should be strength and sealing test, qualified after the ease of use. Strength test, the test pressure for the nominal pressure of 1. 5 times, duration of not less than 5 min, shell and packing shall be no leakage of valve shall be qualified. Sealing test, the test pressure for the nominal pressure of 1. 1 times; The duration of the test pressure test should conform to the requirements of the standard JB/T9092, with no leakage for qualified for valve sealing surface. 4, the valve flange and pipe flange gasket fitted according to the requirements of pipeline design. 5, belt drive mechanism of ball valve, according to the regulations of the product instruction manual installation.
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