Kun Yongjia County of valve Parts Factory produce: Carbon steel welded flange Metal spiral wound gasket. PTFE gasket , Graphite composite mat , Rubber seals , Octagonal pad , Asbestos gasket , Flange gasket ,
PTFE has outstanding excellent overall performance, high temperature, corrosion resistance, non-stick, self-lubricating, excellent dielectric properties, low coefficient of friction used as engineering plastics, it can be made of PTFE tubes, rods , strip, plate, film, etc., generally used in high performance requirements of corrosion-resistant pipes, containers, pumps, valves and system radar, high frequency communications equipment, radio equipment, etc. to join any can withstand the sintering temperature of PTFE in the PTFE fillers, greatly improving the mechanical properties can be obtained, while maintaining other excellent properties PTFE. varieties are filled fiberglass, metal, metallized oxide, graphite, molybdenum disulfide, carbon slender, polyimide, EKONOL. et al., wear limit PV value can be increased 1000 times. PTFE tubing optional suspension polymerization PTFE resin made by ram extrusion
Polytetrafluoroethylene (PTFE) gasket Features:
Tetrafluoroethylene washer is truly advanced and unique material. Anti-creep, anti-cold, ultra-low temperature resistance, pollution-free, easy to install and replace them for excellent performance. In a small preload, even under pressure under environmental changes can be exposed to considerable internal pressure, very suitable for rough or uneven wear and breakable glass surface of the flange seal temperature alternating occasions.
Medium: available for all media except molten alkali metals and elemental fluorine high temperature, partially aromatic compounds.
By Industry: Suitable for chemical, power generation, paper, oil refining, pharmaceutical, food, machinery and other industrial applications of pipes and equipment.
1, bolt preload
EPTFE gasket adopts the shape of the flat convex flange gasket; but on its surface increases sided tooth structure; so; and low pressure (1.6Mpa or less) pipeline, although less pipe flange bolts lower preload, but as long as pressing a few tooth line can be sealed 1.6Mpa less pressure medium. high pressure (4Mpa or less), thick pipe flange bolts, and a larger number than the preload large, according to the normal method of installation of pipes which can tighten the bolt of the entire seal gasket pressed to achieve the effect due to its single-sided tooth structure, the use of pressure so that it can reach 4Mpa. the import of expanded polytetrafluoroethylene use a pressure washer can only reach 1Mpa.
2, compressibility and resiliency
EPTFE gasket compression rate of 30% rebound rate of 25%, with good compressibility and resilience, to ensure long-term effective seal flange.
3, anti-cold flow and creep
In the case of pure PTFE gasket long-term pressure will produce cold flow and creep phenomena leak. And Expanded PTFE gasket cold flow phenomenon to occur it must reach a density of from 1.5 pure PTFE density of 2.2, 1.9 or more when reaching its compressive strength 26Mpa, for pipe flange gasket bolt PN4.0Mpa to maximum preload applied only 14Mpa, cold flow density of less than pure PTFE, expanded PTFE gasket does not produce cold-flow phenomenon, that is, it can ensure the long-term effective seal.