Q: what is the amount of compression for PEEK and PTFE sealing materials?I am just engaged in the design of new valve, in the ball valve, most of the sealing materials are using PEEK, PTFE and RPTFE., I would like to know how much compression when these materials can play a sealing effect?

Answer: it depends on what you need. If the sealing effect of sealing section, PTFE soft, the amount of compression can be big, general 0.2-0.4, PEEK materials are hard, between the amount of compression is generally 0.1-0.3mm, if the axial seal, it also makes the necessary structural design, such as the use of V type structure etc. the main high temperature 260 degrees Celsius, 300 degrees more than general will use the seal.