FIELD: engines and pumps.
SUBSTANCE: invention relates to two-stage seals for use in a pressurized process fluid line. Device has dynamic sealing member (62, 64) and static sealing member (66, 68). Dynamic sealing member is arranged to continuously sealingly engage against a seal surface that slides along the dynamic sealing member. Static sealing member is arranged to sealingly engage against the seal surface in response to an increased process fluid pressure within the process fluid line to increase static seal pressure against the seal surface. Static sealing member is also arranged to release from the seal surface to minimize friction with the seal surface when the process fluid pressure drops and/or in response to movement of the seal surface. Two-stage seal may be used in arrangements requiring both dynamic sealing and static sealing, such as in some process control valves.
EFFECT: process control valve having the two-stage seal is disclosed.
21 cl, 6 dwg
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