Fluid handling – Processes – Involving pressure control
Patent
1984-01-23
1985-11-05
Weakley, Harold W.
Fluid handling
Processes
Involving pressure control
13762546, 251175, 251185, F17D 116
Patent
active
045507422
ABSTRACT:
This disclosure sets forth a variable tensioning system for use in a valve featuring shear seals. In the preferred and illustrated embodiment, a spring system provides loading on the valve element to force that element into engagement with a valve seat. A sliding sealing surface is accomplished in this contact. The valve element may be a tapered plug, a sphere or a flat face or plate. Typically, it is a hard member working against a seat supporting a seal surface featuring a sliding shear seal. A specific minimum load is applied to the valve element to accomplish sealing against minimum pressure. The present apparatus incorporates a closed chamber enclosing a slideable piston. The piston has a specific cross-sectional area exposed to fluid pressure of the fluid being controlled by the valve. The piston applies pressure dependent force against the valve element. This adds to the force applied to the valve element by a spring means, the two forces controllably adding to assure that the seal is sufficiently loaded to perfect a seal up to a specified maximum pressure.
REFERENCES:
patent: 1535212 (1925-04-01), Egloff
patent: 1638152 (1927-08-01), Gabriel
patent: 2792019 (1957-05-01), Lieser
patent: 3090594 (1963-05-01), Floyd
patent: 3297053 (1967-01-01), McKinney
patent: 3640310 (1972-02-01), Erlich
patent: 4328949 (1982-05-01), Oddenino
patent: 4456028 (1984-06-01), Watson
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