초록 ▼

A fire-safe rotary valve seat assembly for use in pressurized fluid systems subject to fire risk, the seat assembly having both a metal seat ring and an annular resilient non-metallic seal member to provide essentially zero fluid leakage at normal operating temperatures, and the metal seat ring to p

A fire-safe rotary valve seat assembly for use in pressurized fluid systems subject to fire risk, the seat assembly having both a metal seat ring and an annular resilient non-metallic seal member to provide essentially zero fluid leakage at normal operating temperatures, and the metal seat ring to provide an extremely low rate of fluid leakage in the event high temperature should destroy the flexible seal member. The metal seat ring includes an annular groove around its radially inward face with a pair of flexible lips forming the walls of the groove, and the annular resilient seal member is mounted in the groove between the lips. The lips and the annular resilient seal member both engage a sealing surface on the circumference of a metal valve disc to provide a primary seal for the valve. If the annular resilient seal member is destroyed, the metal lips continue to provide an undamaged secondary seal.

대표청구항 ▼

A fire-safe seat assembly for a rotary valve having an annular valve body defining a flow passage and a movable valve element supported in the flow passage for controlling flow, comprising: an annular one-piece metallic seat ring including a radially outer rigid body portion merging into radially in

A fire-safe seat assembly for a rotary valve having an annular valve body defining a flow passage and a movable valve element supported in the flow passage for controlling flow, comprising: an annular one-piece metallic seat ring including a radially outer rigid body portion merging into radially inwardly extending arcuately curved relatively thin lips defining therebetween an annular groove, each of said lips having a constant cross-section, an annular resilient seal member disposed between said lips and substantially filling said groove, to extend normally radially inwardly of said seat ring, said lips converging toward each other with a curved configuration to terminate at their radially innermost extremities thereby to retain said seal member in said groove, and, said lips having a spring-like character for respectively flexing at their said innermost extremities and positioned to be engaged by the valve element as said resilient seal member is deformed, thereby to enhance sealing engagement with the valve elements by spring pressure of said metal lips thereagainst on either side of said resilient seal member.