There are many kinds of valves, which are more common: gate valve, globe valve, butterfly valve, ball valve, plug valve, check valve, reducing valve, trap and so on. The valve model is mainly composed of seven numbers or letters, respectively, indicating the valve type, driving mode, connection mode, structure type, nominal pressure, sealing surface material and valve body material.
Valve is widely used in a variety of conveying fluid in the pipeline, the fluid to cut off or adjust the flow and pressure of the fluid, and the fluid of a variety of properties, such as liquid, gas, steam, slurry, suspension, viscous liquid, some fluid with solid particles, dust, chemical substances, etc.. Therefore, in the selection of valves, to consider the valve function, size, fluid temperature, pressure and other aspects of the problem.
Valve is a control component in the pipeline fluid conveying system, it is used to change the path section and medium flow direction, with diversion, cut-off, throttling, check, shunt or overflow pressure relief and other functions. Used for fluid control valves, from the simplest globe valves to the very complex automatic control system used in a variety of valves, its varieties and specifications, the nominal size of the valve from the very small instrument valve to the size of the industrial pipeline valves up to 10m
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