Posi-seal International, Inc.

Jon A Babcock

Andrew Pupillo

John M Cory

Edward W Varney

An assembly for retaining a seal ring in a seating surface of a valve is provided having a circumferential groove disposed in the seating surface for receiving the seal ring. The groove has a pair of substantially opposed side walls, one of which includes a first retention member extending into the groove. The opposite side wall is provided with a circumferential slot which is accessible from outside the valve sealing surface through a passage. A second circumferential retention member is inserted into the slot throughout the passage and protrudes into the groove such that both retention members cooperate to retain the seal ring within the seating surface.

Assembly and method for installing and retaining valve seals

An actuator for a rotary valve includes a fail-safe mechanism for automatically opening or closing the valve upon the occurrence of a predetermined condition. The actuator also includes a mechanism for permitting the manual operation of the valve from the open to closed position, and vice versa, and to a continuum of positions between the open and closed positions even when the fail-safe mechanism is activated. A biased clutch activates the fail-safe mechanism and also couples a worm-gear drive for effecting the manual operation of the valve.

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Westerly, RI, United States of America

Jon A Babcock