Tamperproof rotary valve

Details Tamperproof rotary valve Tamperproof rotary valve

1990-05-21

1991-01-15

Fox, John C.

Valves and valve actuation

With friction detent

251304, F16K 5100

Patent

active

049847678

ABSTRACT:
A tamperproof rotary valve which includes a valve body having a fluid flow passage extending therethrough. The passage is intersected by an actuator opening in the body and defining a valve chamber thereat. A rotary valve is disposed in the chamber for opening and closing the fluid flow passage. An actuator is journaled in the actuator opening and is coupled to the rotary valve for rotating the valve. A groove is formed about the actuator, and a contractible/expandable locking ring is disposed in the groove and projects outwardly of the groove beyond the bounds of the actuator when in a free, expanded condition. The locking ring is contractible into the groove to allow assembly of the actuator into the actuator opening. A locking groove is formed in the actuator opening in the valve body and into which the locking ring expands when the actuator is in a proper assembled position in the actuator opening. The actuator has a cam surface for biasing the locking ring into the locking groove in response to any attempted withdrawal movement of the actuator in said opposite direction. A resilient grommet is compressed between an enlarged portion of the actuator and the valve body to generate torque therebetween to resist rotation. A valve seal is disposed in a seal seat in the valve body about the valve ball, the valve seal being resilient and having a stiffening ring embedded therein.

REFERENCES:
patent: 1929362 (1933-10-01), Liva
patent: 3602340 (1971-08-01), Budzich
patent: 3802661 (1974-04-01), Leopold, Jr. et al.

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