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Use of instrument valves

by:Sure     2021-08-19
The purpose of the instrument valve The instrument valve is a control component in the fluid conveying system. It has the functions of cut-off, regulation, diversion, prevention of reverse flow, voltage stabilization, diversion or overflow and pressure relief. Valves used in fluid control systems, ranging from the simplest shut-off valves to the various valves used in extremely complex automatic control systems, have a wide range of varieties and specifications. Valves can be used to control air, water, and steam instrument valves. Instrument valves are control components in fluid delivery systems. They have functions such as cut-off, regulation, diversion, prevention of reverse flow, voltage stabilization, diversion, or overflow and pressure relief. Valves used in fluid control systems, ranging from the simplest shut-off valves to the various valves used in extremely complex automatic control systems, have a wide range of varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The nominal name of the valve passes from a few mm meter needle valve to a 10m industrial pipeline valve. The working pressure of the valve can be from 1.3×10-3MPa to an ultra-high pressure of 1000MPa. The working temperature ranges from an ultra-low temperature of -269°C to a high temperature of 1430°C. The opening and closing of the valve can adopt a variety of control methods, such as manual, pneumatic, electric, hydraulic, electro-pneumatic or electro-hydraulic linkage and electromagnetic drive, etc.; it can also be under the action of pressure, temperature or other forms of sensing signals, Act according to the predetermined requirements, or simply open or close. The purpose of the instrument valve The valve is a pipe fitting. It is a device used to change the section of the passage and the flow direction of the medium, and control the flow of the conveying medium. Specifically, the valve has the following purposes: to connect or cut off the medium in the pipeline. Such as gate valve, globe valve, ball valve, plug valve, diaphragm valve, butterfly valve, etc. 1. Adjust and control the flow and pressure of the medium in the pipeline. Such as throttle valve, regulating valve, pressure reducing valve, safety valve, etc. 2. Change the direction of medium flow in the pipeline. Such as distribution valve, three-way cock, three-way or four-way ball valve, etc. 3. Prevent the medium in the pipeline from flowing back. Such as various check valves and bottom valves of different structures. 4. Separate the media. Such as various steam traps and air traps with different structures. 5. Indicate and adjust the liquid level. Such as liquid level indicator, liquid level regulator and so on. 6. Other special purposes. Such as temperature regulating valve, overcurrent protection emergency shut-off valve, etc. Among the various general-purpose valves mentioned above, the valves used to connect and cut off the flow of the medium in the pipeline account for about 80% of the total number of valves.
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