The centreline of the cone is rotated away from the valve centreline resulting in an ellipsoidal profile and providing the third offset. With this geometry, seat seal interference is completely eliminated ensuring long sealing life.
The result is a torque seated, process-pressure-aided frictionless seal. The geometry allows the body seat to be used as the closed limit stop, aiding operator adjustment. The triple offset design is ideally suited to metal seated valves providing bubble-tight performance in high/low temperature, high pressure and fire-safe applications.
Offset 1
The shaft is offset behind the seat axis to allow complete sealing contact around the entire seat.
Offset 2
The shaft centreline is offset from the pipe and valve which provides interference free opening and closing of the valve.the entire seat.
Offset 3
The seat cone axis is offset from the shaft centreline to eliminate friction during closing and opening and to achieve uniform compressive sealing around the entire seat.free opening and closing of the valve.the entire seat.
