Structural anti-fire design trunnion mounted ball valve is when the valve in the event of a fire in the use of the site, when non-metallic materials such as polytetrafluoroethylene seat seals, trunnion mounted ball valve stem seals, trunnion mounted ball valve stem seals and packing flange gasket decomposition or destruction at high temperatures, the trunnion mounted ball valve can be by means of a specially designed metal to metal secondary seal structure, effectively control valve leakage and leakage. Fire safety requirements for users of trunnion mounted ball valves, anti-fire design is according to meet APl 607 standard specifications.

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