Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1983-12-15
1985-10-22
Schwadron, Martin P.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251250, 251315, F16K 506
Patent
active
045483841
ABSTRACT:
This invention relates to a ball valve having a valve body with a bonnet bore communicating with a through fluid bore. A valve seat in the valve body surrounds the fluid bore axis. A bonnet with a stem bore extending therethrough is received in the bonnet bore. An operating stem is journalled for rotation in the stem bore. A ball is connected to the stem and located in the fluid bore. The ball has a through passageway. Rotation of the stem causes the ball to rotate eccentrically between an open position at which the ball is spaced from the valve seat with its through passageway aligned with the fluid bore, and a closed position at which the ball blocks the fluid bore by being wedged into sealing engagement with the valve seat. The ball is externally contoured to provide both a clearance from the valve body to accommodate its eccentric rotation, and a stop which is engageable with the valve body to positively locate the ball in its open position. The invention also includes the aforesaid ball valve assembled in combination with an actuator having a linearly reciprocating piston mechanically connected to the valve stem by means of a rack and pinion. Linear motion of the piston is limited in one direction by the sealing engagement of the ball with the valve seat, and in the opposite direction by the engagement of the ball stop with the valve body.
REFERENCES:
patent: 2847180 (1958-08-01), Ludeman
patent: 3262671 (1966-07-01), Muench
patent: 3475003 (1969-10-01), Paluscek
patent: 3484078 (1969-12-01), Haenky
patent: 3885771 (1975-05-01), Baumann
patent: 4029292 (1977-06-01), Kramer et al.
patent: 4260128 (1981-04-01), Tito
Gauthier Maurice E.
Schwadron Martin P.
Shay James R.
Smith Valve Corporation
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