Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1980-03-07
1981-12-15
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
277102, 277125, 277204, 277DIG6, 428408, 428422, F16K 4104, F16J 1522, F16J 1524
Patent
active
043055672
ABSTRACT:
A valve comprises a casing having a passageway therethrough for the flow of fluid and a bore intersecting the passageway. A flow regulating member is rotatably mounted in the bore for blocking the passageway in the valve closed position of the flow regulating member. The flow regulating member has a port therethrough for connecting and being in communication with the passageway in the valve open position. The flow regulating member and the casing define a first chamber at one end of the flow regulating member. A stem is rotatably mounted within the casing and is mechanically coupled to the flow regulating member to rotatably drive the flow regulating member within the casing. The stem has an annular rim formed toward and positioned within the first chamber. At least one annular seal surrounds the stem to effect the seal between the stem and casing. Valving and/or porting is provided for introducing a pressure equal to or greater than the line pressure into the first chamber whereby the pressure acts on the annular rim to move the stem in an axial direction to compress the annular seals which are alternate layers of polytetrafluoroethylene and graphite.
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Rockwell International Corporation
Walton George L.
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