Ball valve

Details Ball valve Ball valve

1989-01-10

1989-09-19

Fox, John

Valves and valve actuation

Rotary valves

Ball valve

137315, F16K 506

Patent

active

048674141

ABSTRACT:
A top open ball valve assembly which includes a pair of camming plates, one at the top and one at the bottom of the plug. The camming plates are oval and in their minor axis are clear of the floating valve seats. There are lost motion slots to allow the plug to travel between an open and closed position without moving the camming plates. In the event it is required to retract the valve seats, the plug is rotated more than 90.degree. so as to engage the camming plates to move them so that the major axis of the oval camming plates is aligned with the flow passage of the inlet and outlet ports, and the camming plates engage and retract the floating valve seats. Annular grooves are provided in the valve seat recess and in the valve seat whereby they are radially aligned when the valve seats are retracted, and an elongated coil spring can be inserted in the passage formed by the grooves to block the valve seats in their retracted position.

REFERENCES:
patent: 3037738 (1962-06-01), Jackson et al.
patent: 3171429 (1965-03-01), Stuermer et al.
patent: 3171431 (1965-03-01), Hansen et al.
patent: 3269691 (1966-08-01), Meima et al.
patent: 3985334 (1976-10-01), Domyan
patent: 4262691 (1981-04-01), Kacal
patent: 4266566 (1981-05-01), Kacal et al.
patent: 4388945 (1983-06-01), Johnson et al.
patent: 4718444 (1988-01-01), Boelte

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