Valves are devices that control fluid flow, pressure and flow. The fluid to be controlled may be a liquid, a gas, a gas-liquid mixture or a solid-liquid mixture. Valve usually by the valve body, valve cover, seat, opening and closing pieces, drive mechanism, seals and fasteners and other components. Valve control function is to rely on the drive mechanism or fluid to drive the hoist up and down, slipping, swing or rotary motion to change the size of the flow area to achieve. The basic parameters of the valve is the working pressure, working temperature and caliber. For a large number of industrial valves used in various valves, nominal pressure and nominal diameter as the basic parameters. Nominal pressure refers to a material valve, at the specified temperature, the maximum allowable working pressure. Nominal diameter refers to the nominal inner diameter of the valve body and pipe coupling end. Valves according to their types and uses have different requirements, the main seal, strength, regulation, circulation, opening and closing and other properties. In the design and selection of valves, in addition to consider the basic parameters and performance, but also consider the fluid properties, including the fluid phase gas, liquid or solid particles, corrosive, viscosity, toxicity, flammable, valuable Rare and radioactive. The classification of the valve by the use of function can be divided into cut-off valve, control valve, check valve, diverter valve, safety valve, multi-purpose valve six categories. Shut-off valve is mainly used to cut off the fluid passage, including the cut-off valve, gate valve, plug valve, ball valve, butterfly valve, diaphragm valve, pinch valve, etc .; regulating valve is mainly used to regulate fluid pressure, flow, etc., including regulating valve, , Pressure reducing valves and float regulating valves, etc .; check valves are used to prevent reverse flow of the fluid; divert valves are used to route the passage of the fluid, or to separate the two-phase fluid, including slide valves, multi-way valves, Row of air valves, etc .; safety valve is mainly used for safety protection to prevent damage to the boiler, pressure vessel or pipe due to overpressure; multi-purpose valve is a valve with more than one function, such as the end of the check valve both from the flow and can Starting and ending effect. Industrial piping valves by nominal pressure can be divided into vacuum valve, low pressure valve, medium pressure valve, high pressure valve, high pressure valve; valve by operating temperature can be divided into room temperature valve, temperature valve, high temperature valve, cryogenic valve; According to the type of drive, with the pipe connection and the use of valve body material classification. The valve can be named individually or in combination according to various classification methods, and can also be named according to the structural features or specific uses of the opening and closing member.
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