| 摘要 |
A fire resistance seat of ball valve for a high temperature and high pressure is provided to serve as a valve even in the worst situation due to fire. A ball valve(10) controls the supply of fluid while moving an open and shut ball installed on a body(12) with operation of a handle(11) equipped on outside. A seat(20) is rested on both sides of the open and shut ball for sealing. The seat comprises a supporting rim(21) of ring shape, made of PTFE(Polytelrafluoro ethylene) and an auxiliary rim(22), made of grarhite reinforced with metal inside the supporting rim, assemble on it. The auxiliary rim is bonded on the supporting rim, close to the open and shut ball in order to act as a seat, in case an outwardly formed supporting rim reaches tolerable melting point and then melts.
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