Network optimization information:
As the name implies, a cryogenic valve is a valve that can work under extremely low temperature conditions. The calibration method of its working temperature is generally called a low temperature valve whose working temperature is lower than -40°C. It is mainly used for liquefaction, separation, transportation and Storage gas and other equipment can be used at temperatures below -270℃. The current types include gate valves, globe valves, check valves, ball valves, butterfly valves, and throttle valves.
In recent years, the application range of ultra-low temperature valves has become more and more extensive. It is an indispensable and important equipment in petrochemical, air separation, natural gas and other industries. Its working medium is not only low in temperature, but also mostly toxic or flammable. It is explosive, and the pilot diaphragm solenoid valve has strong permeability, which determines many special requirements such as valve material and design. Not only need to work normally at the set temperature, but also need to ensure the working performance at room temperature.
Compared with the normal temperature valve, the valve packing parts of the cryogenic valve are all heightened, and the pilot solenoid valve manufacturer is used to extend the stem. The goal is to reduce the heat of the external input equipment; ensure that the temperature of the stuffing box is higher than 0°C so that the stuffing can work normally; prevent the valve stem and the upper part of the valve cover from frosting or freezing due to the overcooling of the stuffing box.
The design of the long neck sealing cover is mainly the design of the long neck L. L refers to the distance from the bottom of the stuffing box to the upper surface of the upper sealing seat. It is related to the thermal conductivity of the material, the thermal conductivity area, the surface heat dissipation coefficient, the heat dissipation area and other factors. Comparing calculations It is cumbersome and is generally obtained by experimental methods.
Ferritic stainless steel can be used above -100°C, austenitic stainless steel can be used below -100°C, copper alloy or aluminum alloy can be used in low-pressure, small-diameter valves, and the valve body should be able to withstand the expansion caused by temperature changes. , Shrink, the structure of the valve seat part will not be permanently deformed due to temperature changes.