Plastic and elastic parts are not suitable for temperatures below -180 ° c. In this temperature range, packing and spool sealing elements need special consideration, can no longer use soft seal (soft seal will be hard and lack of flexibility, cannot provide good cutting ability). Cryogenic valves at this temperature use special elastic materials and require special loads to provide good cutting.
2. Packing seal should pay attention to the problem
At low temperatures, moisture in the atmosphere condenses at temperatures below freezing, creating a layer of frost. If frost forms on the stem surface, when the stem is driven up and down by the actuator, this frost may be pulled into the packing and cause a tear, thereby damaging the seal. Therefore, cryogenic valves should have an elongated upper bonnet to keep the regulator stuffing box area away from the cryogenic area and to prevent frost forming in the stem and stuffing box area.
ZJCLV factory, like many other cryogenic ball valves manufacturers, specializing in the production of various valves, ball valves, globe valves, check valves, gate valves, butterfly valve flange and so on. For more information of ZJCLV, click on the website: www.clvvalve.com.