Type of Valve & Working Principle---Part 2

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Zhangjiagang Reliable Machinery Co.,LTD

Type of Valve & Working Principle


  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 achievement.

  Valves are used for a wide range of purposes. They are closely related to people's daily life. For example, faucets for water pipes and pressure reducing valves for liquefied petroleum gas are all valves. Valves are also indispensable components for various mechanical equipment such as internal combustion engines, steam engines, compressors, pumps, pneumatic transmissions, hydraulic transmissions, vehicles, ships and aircraft.

  Valves by using the function can be divided into shut-off valve, control valve, check valve, divert valve, safety valve, multi-purpose valve six categories.

  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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divert valve                                               safety valve

  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 considering the basic parameters and performance, but also consider the fluid properties, including the fluid phase (gas, liquid or solid particles), corrosive, viscosity, toxicity, flammable and explosive , Precious rarity and radioactivity.


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