Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1987-12-11
1988-12-27
Walton, George L.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
13762518, 13762525, 13762548, 25112907, 25112915, 2511292, 251174, 251325, F16K 11065, F16K 2500, F16K 3102
Patent
active
047935910
ABSTRACT:
A shear seal valve includes a valve body defining an interior valve chamber and a slide member axially movable in the valve chamber. Fluid passages, formed in the valve body and the slide, are selectively interconnected in accordance with the relative position of the slide member within the valve chamber, and tubular shear seals, biased tightly against the slide, avoid fluid leakage along the slide. To provide low-friction sliding movement of the slide relative to the slide body, a pair of roller bearings are supported by the valve body so as to engage the slide. By mounting the roller bearings to the valve body rather than to the slide itself, the slide can be made smaller, and greater freedom in the location of the fluid passages within the slide is obtained. To simplify construction and assembly, the roller bearings are mounted in a removable cover plate forming a part of the valve body and defining one wall of the interior valve chamber. Preferably, the tubular shear seals include frusto-conically shaped flanges for limiting movement of the seals and for avoiding the development of cocking forces on the seals.
REFERENCES:
patent: 2925095 (1960-02-01), Bates
patent: 3432141 (1969-03-01), Irti et al.
patent: 3482816 (1969-12-01), Arnold
patent: 3530893 (1970-09-01), Masuda
patent: 3761054 (1973-09-01), Abdo
patent: 3776276 (1973-12-01), Stiltner
patent: 4372531 (1983-02-01), Rollins et al.
Decker Arnold F.
Reynolds Roy
Templeton, Kenly & Co.
Walton George L.
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