Hard seal ball valve structure form the structure of ball Industrial Valves is divided into a floating ball type and fixed type, connection form for flange connection, welding connection and screw thread connection. Hard seal ball valve working principle of the hard sealing ball valves, manual cast steel hard seal ball Industrial Valves body surface using the advanced coating technology, through to the various conditions of processing, the highest hardness can reach HRC78. The processing of valve seat sealing surface, the highest hardness can reach HRC72. Sphere and valve seat match grinding ball valve the sealing surface of all sealing area after precision grinding. Suitable for high temperature and high pressure water, steam, oil, coal, fiber, viscous and corrosive medium, and the medium with particles. Metal sealing ball valves have a floating ball and a fixed seat ring in contact with the spherical structure of two kinds of metal, by acting on the seat ring spring load evenly to make seat ring and sealing spherical form. As a result of the action of the spring load makes the auxiliary seal, realize the seal between the valve body and valve seat. Spring load enough to provide the seat between the sphere and reliable seal, under the condition of low pressure, can design between the valve seat sealing surface and sphere with sealing grease injection system. Ball valve features 1) , small flow resistance; 2) And simple structure; 3) , small volume, light weight; 4) , the ball valve sealing surface of the plastic material selection, sealing well; 5) , easy to operate, open and close quickly, facilitate remote control; 6) , convenient maintenance, sealing ring, which generally remove easy to change; 7) , full open or full close, sphere and Industrial Valves seat sealing surface and the dielectric isolation, medium through does not cause the valve sealing surface erosion. Ball valve category 1) , common ball valve according to its working principle is divided into floating ball valve, fixed ball valve, lifting lever type ball valve, etc. 2) , area of the ball valve according to the passage, can be divided into straight-through three-pass and right Angle type. Two kinds of ball valves for distribution after the medium and change the flow of medium. Ball valve construction, installation, points 1) , installation location, altitude, direction must comply with the design requirements of imports and exports, connection should be firmly connected. 2) And all kinds of manual valves installed on the thermal insulation pipe, handle shall not down. 3) And a visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards 'universal signal valve' GB 12220. For the working pressure is greater than 1. 0 MPa and the valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must 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. Leak test, the test pressure for the nominal pressure of 1. 1 times; The duration of the test pressure in the test should comply with the standard of GB 50243 requirements, with no leakage for qualified for valve sealing surface. 4) , 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. Ball valve executive standard 1) , product standards, the common valve flange and butt welding of steel ball valve, GB/T12237 - Iron and copper ball valve, GB/T 89-15185 'The general requirements of steel valves GB/T 1994-12224 2005 'ShuPeiShui equipment and protective materials for domestic and drinking water safety evaluation standard' GB/T 17219 - 19982). , engineering standard 'architectural water supply and drainage and heating engineering construction quality acceptance standard' GB - 50242 2002 'ventilation and air conditioning engineering construction quality acceptance standard' GB - 50243 2002 network quality of valve ball valve manufacturers recommend: special valve group co. , LTD. ; Zhejiang Morgan valve co. , LTD
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