Steps and basis for valve selection before procurement

In the fluid pipeline system, the valve is the control element. Its main function is to isolate the equipment and pipeline system, regulate the flow, prevent backflow, and regulate and discharge the pressure. As it is very important to select the most suitable valve for the pipeline system, it is also very important to understand the characteristics of the valve and the steps and basis for selecting the valve

So far, the valve industry has been able to produce 12 categories, more than 3000 models and more than 4000 specifications of valve products such as gate valve, stop valve, throttle valve, plug valve, ball valve, electric valve, diaphragm valve, check valve, safety valve, pressure reducing valve, steam trap and emergency shut-off valve; The maximum working pressure is 600MPa, the maximum nominal diameter is 5350mm, the maximum working temperature is 1200 ℃, and the minimum working temperature is - 196 ℃. The applicable media are water, steam, oil, natural gas, strongly corrosive media (such as concentrated nitric acid, medium concentration sulfuric acid, etc.), flammable media (such as benzene, ethylene, etc.), toxic media (such as hydrogen sulfide) Explosive media and radioactive media (metal sodium, - circuit pure water, etc.)

Materials of valve pressure parts: cast copper, cast iron, nodular cast iron, high silicon cast iron, cast steel, forged steel, high and low alloy steel, stainless and acid resistant steel, Hastelloy, Inconel, Monel alloy, duplex stainless steel, titanium alloy, etc. And can produce all kinds of electric, pneumatic and hydraulic valve driving devices. In the face of so many valve varieties and so complex working conditions, to select the valve products most suitable for installation in the pipeline system, I think we should first understand the characteristics of the valve; Secondly, we should master the steps and basis of selecting valves; Moreover, the principle of selecting valves shall be followed

Special statement: the above article only represents the author's own point of view