What are the conditions for PTFE gasket sealing?
The PTFE gasket is a polymer compound obtained by polymerizing tetrafluoroethylene. It has excellent chemical stability and corrosion resistance. It is one of the best corrosion resistance materials in the world, except for molten sodium and liquid fluorine. It does not change when boiled in water.
If the PTFE gasket has sufficient resilience, so that the working seal specific pressure on the sealing surface is always greater than the medium and the operating specific pressure, the sealing surface maintains a good sealing state. The necessary conditions for the forced sealing are in the medium and operation. Under the action of the force, the sealing surface can still maintain a certain pressing force.
At the time of forced sealing of the PTFE gasket, the medium pressure always tends to reduce the pre-tightening seal to lower the sealing performance. Typical structures for forced sealing of PTFE gaskets are flat gasket seals, wound gasket seals and toothed gasket seals, etc., which are commonly used for low pressure, medium pressure and medium and small diameter valves.
When we seal the PTFE gasket, we should all need to meet its sealing conditions, so that the PTFE gasket can be better maintained and the service life will be longer.