Opening and closing a gate valve is ram, ram movement direction perpendicular to the direction of flow, gate valve can only be fully open and close, not to adjust and throttling. Sealing face has two gate, the commonly used pattern formed two sealing face of gate valve wedge, the wedge Angle vary with the valve parameters, usually for 5 °, medium temperature is not high for 2 ° 52 '. Wedge gate valve of the damper can be made into a whole, is called a rigid disc; Can also make it generates trace of deformation of ram, in order to improve the manufacturability, make up for the sealing surface Angle in the process of our processing deviation, this damper is called elastic disc. Gate valve is closed, sealing surface can only rely on medium pressure to seal, that depend on medium pressure, the disc will be to the other side of the valve seat sealing surface pressure to ensure that the seal face seal, this is the seal. Most is adopt compulsory seal gate valve, the Industrial Valves is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface sealing. The gate valve gate, linear motion, with the stem called lifting lever gate, also called rising stem gate valves. Gate valves main features: 1, compact structure, reasonable design, the valve rigidity, smooth channel, small flow resistance coefficient. 2, the sealing surface of stainless steel and carbide, long service life. 3, using the flexible graphite packing, reliable seal, flexible operation of the light 4, pneumatic, electric, drive way to break up, gear, structure: elastic wedge single ram, rigid wedge single ram and double disc type. 5, widely used in petrochemical, oil, steam pipeline, such as coal-fired power plants connected or truncate the medium inside the pipe opening and closing device. Gate valve installation points: 1, the installation location, altitude, direction must comply with the design requirements of imports and exports, connection should be firmly connected. 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 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 Industrial Valves 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, hand wheel, lever and the transmission mechanism are not allowed for lifting, it is forbidden to collision. 5, belt transmission mechanism of the gate, according to the regulations of the product instruction manual installation.
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