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Fakai Valve Factory Site: Yongxing Industrial Zone, Longwan District, Wenzhou City Tel: 0577-88767789
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Introduction of low temperature valve and normal temperature valve

Release Date: May 23, 2018

Compared with the normal temperature valve , the cryogenic valve valve has a higher filling part and uses an extended stem. The purpose is to reduce the amount of heat introduced into the device from the outside; to ensure that the temperature of the stuffing box part is above 0 ° C, so that the stuffing can work normally; to prevent the valve stem and the upper part of the stuffing box part from being too cold due to the part of the stuffing box being too cold Frosted or frozen.

The design of the long neck valve cover is mainly the design of the neck length L. L refers to the distance from the bottom of the stuffing box to the upper surface of the upper seal seat. It is related to the thermal conductivity of the material, the thermal conductivity area, the surface heat dissipation coefficient, and the heat dissipation area. The calculation is tedious, and it is usually obtained by experiments.

Ferritic stainless steel can be used when the temperature is higher than -100 ℃, and austenitic stainless steel can be used when the temperature is lower than -100 ℃. Copper alloy or aluminum alloy can be used for low-pressure and small-caliber valves. Expansion and contraction, and the structure of the valve seat will not be permanently deformed due to temperature changes.