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Basic knowledge of valve
Jun 02, 2018

The valve is the control device of the fluid pipeline. Its basic function is to connect or cut off the circulation of the medium, change the circulation of the medium, change the flow direction of the medium, adjust the pressure and flow of the medium, and protect the normal operation of the equipment of the pipeline.

The large number of applications for industrial valves are after the invention of the steam engine by Watt. In the past twenty or thirty years, higher requirements have been made to the valves due to the needs of petroleum, chemical, power plants, metallurgy, ships, nuclear energy, aerospace and other aspects, to promote the research and production of high parameters of the valve, and its working temperature is from -269 to high to high. Temperature 1200 C, even up to 3430 degrees C, working pressure from supervacuum 1.33x10-8Mpa (1x10-1 Hg) to ultra-high pressure 1460MPa, valve path from 1mm to 600mm, even to 9750mm, valve material from cast iron, carbon steel to titanium and titanium alloy, high strength corrosion resistant steel, valve drive mode from manual to electric, Pneumatic, hydraulic, program control, numerical control, remote control and so on.

With the continuous development of modern industry and the increasing demand of the valve, a modern petrochemical plant needs thousands of various valves, and the use of the valve is large. Frequent opening and closing, but often due to the production, use of type selection, improper maintenance, occurrence of running, running, dropping, leakage, resulting in fire, explosion, poisoning, scald accidents, or resulting in poor quality of the product, energy consumption, equipment corrosion, material consumption, environmental pollution, and even cause a stop of accidents, has been often seen. So people want to get high quality valves, and also need to improve the use and maintenance level of the valves. At this time, new requirements are put forward for the operators, the maintenance personnel and the engineers and technicians. In addition to the careful design, reasonable selection and operation of the valves, the valve should be maintained and repaired in time. So that the valve "running, running, dropping, leaking" and all kinds of accidents to a minimum.