Ball valve

Details Ball valve Ball valve

1989-09-20

1990-06-12

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

13761417, F16K 1518

Patent

active

049324365

ABSTRACT:
A ball valve includes a valve casing accommodating therein an upstream ball seat and a downstream ball seat and defining a cavity between the two ball seats, a ball provided with a through hole, accommodated in the cavity and brought into sealing contact with the two ball seats at the outer periphery thereof, a valve stem having one end thereof fixed to the ball, a valve handle fixed to the other end of the valve stem, a check valve accommodated in the through hole of the ball and biased toward the upstream side, a path formed on the ball and, when the ball valve is closed, causing the downstream side and the cavity to communicate with each other, and a connection port formed on the valve casing so as to communicate with the cavity and having a free end thereof connected to one end of a nipple having the other end thereof covered with a cap. The ball opens and closes the ball valve through the valve stem by a rotating operation of the valve handle.

REFERENCES:
patent: 1228060 (1917-05-01), Schulder
patent: 1889805 (1932-12-01), Johnson
patent: 3146792 (1964-09-01), Donnelly et al.
patent: 4371146 (1973-02-01), Mese et al.

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