Ball valve selection methods: the working principle of ball valve is established by rotating sphere to keep the valve open or occlusion. Ball valve switch lightweight, small size, can make it big caliber, reliable sealing, simple structure, convenient maintenance, sealing surface and the spherical often in the closed state, not easily be medium erosion, has been widely used in various industries. Ball valve can be roughly 19 kinds, floating ball valve, ball valve, metal hard seal fixed ball valve, ball valve, wafer ball valves, heat preservation v-shaped ball valve, pipeline ball valve, the track ball valve, the jacket type ball valve, pigging valves, high pressure forged ball valve, tee, Four-way) Ball valves, threaded ball valve, integral ball valve, cryogenic Industrial Valves, corrugated pipe, full welded ball valve, ball valve, eccentric half ball valves, special valves, etc. O type ball valve structure of floating type, ball core for precision casting, hard chromium plating processing, appearance seat by metal or enhanced ptfe material, flow crossing the same as the pipe diameter, flow capacity, little flow resistance, closing without leakage, generally do switch valve is used, especially suitable for high viscosity, fiber, granular media. V-shaped ball valve USES the fixed structure, the ball on a v-shaped incision, which can realize proportional control, flow characteristic is approximate equal percentage. Ball valve applicable range is very wide, the ball valve can be applied to: 1, from the nominal diameter of 8 mm to 1200 mm. 2, nominal pressure from vacuum to 42 mpa. 3, from operating temperature 204℃~815℃。 Especially in the petroleum, chemical industry, metallurgy and other departments, the equipment and piping system of inflammable, explosive medium used in the soft sealing ball valves, more attention should be paid to refractory and fire prevention. Usually, in two position adjustment, sealed performance is strictly, mud, wear, reducing channel, opening and closing action quickly ( 1/4 turn to open/close) , high pressure cut-off ( Differential pressure) , low noise, have spirit cave and gasification phenomenon, into the atmosphere of a small amount of leakage, small operation torque, small fluid resistance of the pipeline system, it is recommended to use ball valves. Ball valve can also be applied to light structure, low pressure cut-off ( Small pressure difference) , corrosive medium in the pipeline system. In the low temperature ( Cryogenic) And also can choose ball valve in the pipeline system. When in requires regulation performance, need to choose the special structure of ball valve with v-shaped opening. In the petroleum, petrochemical, chemical, electric power, city construction, the working temperature at 200 ℃ or more of the piping system can choose metal to metal sealed ball valve. Oxygen piping system in metallurgical industry, the need to use strict degreasing process of ball Industrial Valves. Mains in the pipeline and gas transmission pipeline should be buried in the ground, the need to use full size welded ball Industrial Valves. Ball valve widely used in irrigation system, mainly used in the pipe inlet. Ball valve has simple structure, small size, the flow resistance is small, the drawback is turned on or off too fast, middle water hammer in pipe ( The pipe flow speed suddenly change when the pressure rises) 。 So on ZhuGanGuan unfavorable use ball valve, can be used in or dry, branch pipe on its end for wash, good effect washing sewage main business products are pneumatic valve electric valves, pneumatic ball valves, electric ball valves, pneumatic butterfly valves, electric butterfly valve are welcome and the choose and buy. In this paper, the keyword search: long ding automatic control equipment co. , LTD
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