Fluid handling – With leakage or drip collecting
Patent
1996-09-24
1998-03-31
Walton, George L.
Fluid handling
With leakage or drip collecting
137315, 251214, 251330, 277 59, 277 69, 277110, 277124, F16K 4104, F16K 4300, F16K 4114, F16J 1520
Patent
active
057327319
ABSTRACT:
In combination with a gate valve comprising a valve body having an internal cavity extending between an inlet port and an outlet port, a bonnet mounted to the valve body and having an internal passageway in communication with the cavity, a valve stem rotationally supported in the passageway, a handle connected to one end of the valve stem and a gate threadedly connected to the other end of the valve stem, the improvement comprising a first packing for sealing between the bonnet and the valve stem to prevent pressure within the cavity from escaping through the passageway, a second packing for sealing between the bonnet and the valve stem to prevent pressure within the cavity from escaping through the passageway, the second packing being located between the first packing and the cavity, a bypass port extending between a first portion of the passageway below the second packing and a second portion of the passageway above the second packing, and a bypass valve for selectively closing the bypass port such that the first packing contains the pressure when the bypass port is open and the second packing contains the pressure when the bypass port is closed.
REFERENCES:
patent: 2780233 (1957-02-01), Volpin
patent: 3990679 (1976-11-01), Boitnott
patent: 4149558 (1979-04-01), McGee et al.
patent: 4245661 (1981-01-01), McGee
patent: 4289157 (1981-09-01), McGee
patent: 4307745 (1981-12-01), McGee
patent: 4364542 (1982-12-01), Meyer
patent: 4379557 (1983-04-01), Saka
patent: 4886241 (1989-12-01), Davis et al.
patent: 4972867 (1990-11-01), Ruesch
patent: 5062439 (1991-11-01), Butler et al.
patent: 5078175 (1992-01-01), Martin et al.
patent: 5129624 (1992-07-01), Icenhower et al.
patent: 5203370 (1993-04-01), Block et al.
patent: 5221063 (1993-06-01), Wafer et al.
patent: 5244183 (1993-09-01), Calvin et al.
patent: 5263682 (1993-11-01), Covert et al.
patent: 5312087 (1994-05-01), Jones
patent: 5476117 (1995-12-01), Pakula
FMC Corporation
Query, Jr. Henry C.
Walton George L.
LandOfFree
Secondary seal bypass valve for gate valves does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Secondary seal bypass valve for gate valves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Secondary seal bypass valve for gate valves will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-44215