① Introduction of gasket
Polytetrafluoroethylene (PTFE) packing gasket is a kind of non-metallic composite cushion, which is generally composed of two parts: the cover and the insert. The main function of the envelope is anti-corrosion, which is usually made of polytetrafluoroethylene. The insert (filler) is a non-metallic material with or without metal reinforcement, which is usually made of asbestos rubber sheet.
Polytetrafluoroethylene (PTFE) packing gasket is mainly suitable for full plane and raised face steel pipe flange connection. It is suitable for corrosive medium with nominal pressure PN of 0.6 ~ 5.0mpa and working temperature of 0 ~ 150 ℃ or medium with high cleanliness requirements.
② Form of gasket
Polytetrafluoroethylene (PTFE) gasket for pipe flange can be divided into three types according to manufacturing methods: cutting type (s type), machining type (M type) and folding type (F type).
For the machined packing gasket, the inner diameter of the packing layer can be consistent with the inner diameter of the flange, so as to prevent the eddy current of the fluid at the flange. As for the folded packing gasket, it is made of 0.4-0.8 mm thick polytetrafluoroethylene (PTFE) film. After heat sealing, both ends of the gasket are wrapped outside the annular core material in U shape. It is easy to manufacture and suitable for large flange sealing.
③ Tag – Tag example
Cut PTFE gasket with nominal diameter of 50 mm and nominal pressure of 1.0 MPa:
S-50-1.0 GB/T１３０４－１９９２
Machining type PTFE gasket with nominal diameter of 50mm and nominal pressure of 1.0MPa:
M-50-1.0 GB/T１３０４－１９９２
Folded PTFE gasket with nominal diameter of 50 mm and nominal pressure of 1.0 MPa:
F-50-1.0 GB/T１３０４－１９９２
Post time: Apr-01-2021