PTFE commonly known as "plastic king", the Chinese trade name "Teflon", "Teflon" "Teflon", "Teflon", "Teflon" and so on. It is made of tetrafluoroethylene by polymerization of polymer compounds, with excellent chemical stability, corrosion resistance (corrosion resistance in the world today is one of the best materials, in addition to the molten metal sodium and liquid fluorine, resistant to other All chemicals boil in aqua regia can not afford to change, widely used in various needs of acid and alkali and organic solvents), sealing, high lubricity non-stick, electrical insulation and good anti-aging endurance, excellent temperature Can work long term at temperatures from + 250 ° C to -180 ° C). PTFE is widely used as the material of the valve seat for a variety of conditions that require acid and alkali resistance and corrosion. PTFE is wound on a rubber ring, fixed in the groove of the separate valve body, the valve opens, the rubber core rebound, so that the slow recovery of Teflon to the desired location, In order to cut off severely the next time it is closed. This structure seals a pressure drop of 720 psi (50 bar) after 100,000 starts. The rubber O-ring is isolated and does not come into contact with the fluid in the line. Seals automatically compensate for wear and heat changes. A cam-operated biased valve plate reduces torque and seal wear. Other structures include Teflon "slip seals" which are placed over a resilient rubber O-ring. This structure has been successfully operated to a pressure drop of 1500 lbs / in2 (103 bar). The valve seat clamped between the valve body and the ring is fixed by the pipeline flange. The combination of lip and seal with PTFE-filled Teflon seats allows tight shutoff of thousands of air bubbles, and for smaller-bore valves, it operates over a temperature range of -320 ° to 500 ° C ° F and a pressure differential of 720 psi. Special dry lubricated metal seat can operate to 700 ° F. Eccentric valve disc and offset shaft structure of the valve disc in the initial rotation within several degrees lifted off the valve seat, which eliminates the unbalanced load, thus extending the life of the valve seat. This form of valve caliber range up to 30 inches. Automatic Paper Lunch Box Machine hangzhou mankun imp. exp. co., ltd. , https://www.multihzs.com
ã€Print】 ã€Close】