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Why is the flow of the shut-off valve medium low and high?

The movement of the valve stem, (common name: dark rod), also has a lifting rotary rod type that can be used to control various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. flow. Therefore, this type of shut-off globe valve is well suited for shut-off or regulation and throttling. Due to the relatively short opening or closing stroke of the valve stem of this type of valve, and the very reliable cutting function, and because the change of the valve seat opening is proportional to the stroke of the valve flap, it is very suitable for the adjustment of the flow rate.
Generally, the medium and low pressure shut-off valves are low in and out, and the packing is not subjected to force when cut off, which reduces the probability of leakage and can prolong the service life. Generally, the shut-off valve of DNA100 can adopt high-input and low-out; it is difficult to close the valve with low-input and high-pressure under large-caliber and high-pressure conditions. Second, because the valve stem is long-term if it is low-in and high-out under high-pressure and large-diameter conditions. The water pressure is easy to deform and bend, which affects the safety and sealing of the valve. Thirdly, if the height is low, the diameter of the valve stem can be small, which will save the cost for the manufacturer and the user.
The small-diameter globe valve generally adopts low-in and high-out valves. The main reason is that the filler does not work for a long time under the pressure state, prolonging the service life of the filler. Secondly, it also has a certain protective effect on the valve stem. The most important thing is safety. If the stem is broken or other faults occur, the shut-off valve can be opened automatically to prevent overpressure.
Large-diameter globe valves use high-in and low-out, for reasons of consideration, operating force, and sealing problems.

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