Cryogenics is the science of materials and processes at temperatures below -150 ° F (-101 ℃). Used for the low-temperature conditions control valve, such as high-temperature control valve (control valve), requires consideration of many of the same factors. Usually a temperature below 0 ° F (-18 ℃), plastics and the elastic material member does not work properly. Within these temperature ranges, such as fillers and the like of the plug seal element needs special consideration. Standard soft seal plug seal will harden and reduce flexibility, so as not to turn off the ability to provide a soft seat usually available. At these temperatures, it is necessary to use a special elastic material in order to obtain a tight seal and the need to provide special loads.
In cryogenic applications, frost may be formed on the valve, so the filler is a consideration of the cryogenic applications.
Atmospheric moisture on the cooler surface, and the surface temperature is below the freezing point of condensation, and forming a layer of frost. With this layer of frost or ice in the pneumatic control valve (control valve) the valve cover and stem surface, causing tearing and stem actuator driver, this layer of frost on the stem will be pulled into the filler, thus break the seal. The solution is to use the the elongation type valve cover such that the regulating valve (control valve) stuffing region is the ambient temperature is heated, thereby preventing the formation of frost in the region of the stem and the filling letter. Elongation type valve cover length depends on the application of the temperature and insulation requirements of the occasion. Applications where the temperature is lower, the required elongation type valve cover longer.
Valve for cryogenic applications, material selection is usually the valve body and the valve cover CF8M, 300 series stainless steel trim. Flash occasions, it may need to surface hardened to resist erosion.
Very broad due to the use of the valve with a valve in a different mix of different occasions and conditions, if you are non-professionals, to welcome you to the company to inquire. Professional and technical personnel of the Company to serve you.
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