{"id":49865,"date":"2026-08-31T11:17:59","date_gmt":"2026-08-31T11:17:59","guid":{"rendered":"https:\/\/www.fhtvalves.com\/?p=49865"},"modified":"2026-08-31T11:30:19","modified_gmt":"2026-08-31T11:30:19","slug":"ball-valves-with-soft-polymer-seats-for-high-temperatures-up-to-300c","status":"publish","type":"post","link":"https:\/\/www.fhtvalves.com\/en\/ball-valves-with-soft-polymer-seats-for-high-temperatures-up-to-300c\/","title":{"rendered":"Ball valves with soft polymer seats for high temperatures up to 300\u00b0C"},"content":{"rendered":"

Ball valves with soft polymer seats for high temperatures make it possible to maintain tight shut-off and reliable dimensional stability in services that significantly exceed the practical limit of virgin PTFE. The compound used in these seats, known as Fluoro HT, has been specifically developed to operate at 300\u00b0C while maintaining much lower deformation under load than a standard seat.<\/span><\/p>\n

This type of seat solves a recurring problem in thermal processes: conventional PTFE, although the reference material for soft seats due to its chemical inertness, loses dimensional stability above certain temperature and pressure thresholds, compromising valve tightness.<\/span><\/p>\n

BUTTON –\u00a0<\/span><\/p>\n

What Is Fluoro HT Polymer and Why Is It Used in Ball Valve Seats<\/b><\/h2>\n

Fluoro HT is a special polymer compound designed for high-temperature applications where dimensional stability is a critical requirement. Unlike virgin PTFE, its formulation significantly reduces the phenomenon of creep under sustained load at elevated temperatures.<\/span><\/p>\n

In a ball valve seat, dimensional stability directly determines the ability to maintain the seat preload against the ball. If the material deforms excessively, the seat loses effective contact and the valve begins to experience internal leakage, even when there is no apparent visible damage.<\/span><\/p>\n

Material Composition and Behaviour<\/b><\/h3>\n

Fluoro HT maintains a base compatible with the applications commonly associated with PTFE, but with a modified structure that improves its mechanical behaviour at elevated temperatures. This makes it a direct alternative for replacing virgin PTFE seats in services where process temperature is the limiting factor.<\/span><\/p>\n

Why Virgin PTFE Is Not Sufficient for High-Temperature Services<\/b><\/h2>\n

Virgin PTFE is a reference material for soft seats due to its chemical resistance and low coefficient of friction. However, under sustained load and elevated temperatures, it exhibits a level of deformation that can compromise long-term tightness.<\/span><\/p>\n

Comparative tests carried out according to <\/span>ASTM D261<\/b>, applying a load of 3.45 MPa for 24 hours at 300\u00b0C, show a significant difference between the two materials:<\/span><\/p>\n