Valves and valve actuation – Rotary valves – Ball valve
Patent
1993-07-19
1995-05-30
Fox, John C.
Valves and valve actuation
Rotary valves
Ball valve
251317, 25131513, F16K 506
Patent
active
054195322
ABSTRACT:
A design for a ball valve seat uses elastomer and a hard material such as graphite or plastic to seal both high and low pressures. The seat is ring shaped. The seal is positioned on one end. In one embodiment, a rubber O-ring is installed in an outer groove, a plastic ring is installed in the inner groove. In another embodiment, the rubber is chemically heat bonded on the outside diameter of the plastic ring. The combination insert is installed in a single groove. Under low pressure, the rubber ring is compressed by a backing spring and urged against the ball to complete the seal. At higher pressures, the rubber ring is compressed more until the plastic ring contacts the ball. By the time the pressure reaches the initial plastic sealing pressure (below 1000 psig by design) the pressure between rubber ring and plastic ring will be the initial plastic sealing pressure. The low pressure zone will remain low pressure even when the upstream pressure is further increased. When the valve is turning to open and passes the rubber ring, the low pressure will be released while the high pressure is still sealed by the plastic ring. When the valve passes the plastic ring, the high pressure will be released while the rubber is away from the high speed cutting flow so that the rubber ring will not be damaged by the flow.
REFERENCES:
patent: 3746303 (1973-07-01), Grove et al.
patent: 3765647 (1973-10-01), Grove et al.
patent: 3972507 (1976-08-01), Grove
patent: 4163544 (1979-08-01), Fowler et al.
patent: 4552335 (1985-11-01), Alexander et al.
PBV Specifications Series 5700/6700 2"-24" Type, pp. 1-8.
PBV Specifications Series 5660/6660 2"-12" Type, Pages.
PBV-USA Pipeline Ball Valves.
Casperson John R.
Fox John C.
PBV-USA, Inc.
LandOfFree
Valve seal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve seal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve seal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-357292