Valves and valve actuation – With means to increase head and seat contact pressure – Gate valve
Patent
1988-06-16
1989-06-13
Chambers, A. Michael
Valves and valve actuation
With means to increase head and seat contact pressure
Gate valve
251159, 251187, F16K 2500
Patent
active
048385204
ABSTRACT:
A valve for a vacuum enclosure, the valve comprising a valve body (1) which is hollow about an axis .DELTA. and which opens out to the outside via two opposite end openings (24, 25) of the valve body, thereby enabling the valve to be inserted in a pumping circuit, the inside of said valve body being provided by closure means constituted by a strip (7) which is movable in its own plane, which plane extends perpendicularly to the axis .DELTA. said strip being provided with at least one opening (8) and being associated with two pay-out and take-up drums (9, 10) provided with drive means, said valve body being further provided with sealing means situated between the two drums and comprising a fixed gasket (15) fixed to the valve body and situated on a first side of the strip and a moving gasket system capable of moving parallel to the axis .DELTA. and situated on the other side of the strip from the fixed gasket, the valve being characterized in that said moving gasket system includes a plurality of balls (30) which are held spaced apart from one another around a circumference by means of a rotatable cage (31), the assembly comprising said balls and said cage being disposed between a clamping ring (34) which is axially displacable and which is provided with conical depressions (35) for receiving the balls and a plane portion (36) of the valve body which is also provided with conical depressions (37) for receiving the balls, said cage (31) being associated with means (32, 33) enabling it to be rotated thorugh an angle .alpha., the clamping ring being axially slidable in sealed manner along a cylindrical bearing surface (40) inside said valve body.
REFERENCES:
patent: 1727677 (1929-09-01), Siebert et al.
patent: 2952437 (1960-09-01), Knox
patent: 3254873 (1966-06-01), Knox
patent: 3704722 (1972-12-01), Coleman
patent: 3828816 (1974-08-01), Barnebey
patent: 4219183 (1980-08-01), Hoffmann et al.
patent: 4470576 (1984-09-01), Schertler
patent: 4509717 (1985-04-01), Wright et al.
Frindel Sebastien
Mimeur Jacques
Alcatel Cit
Chambers A. Michael
Fox John C.
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