Fail safe mechanism for valve using a cock and lock return...

Details Fail safe mechanism for valve using a cock and lock return... Fail safe mechanism for valve using a cock and lock return...

2007-08-15

2010-02-23

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Biased trip

Electrical trip actuation

C251S069000

Reexamination Certificate

active

07665714

ABSTRACT:
A fail safe mechanism having a return member, valve stem extension, energy storage member, and locking assembly. The valve stem extension is driven by an electrical actuator and configured to drive the return member in a first direction and to be driven by the return member in a second direction. The energy storage member is configured to store energy when the electrical actuator causes the valve stem extension to drive the return member in the first direction and to release the energy stored therein when a disruption of power causes the return member to drive the valve stem extension in the second direction. The locking assembly is configured to hold the return member in a cocked position such that the valve stem extension rotates with the valve independently of the return member and free of influence from the energy storage member while the power is applied to the electrical actuator.

REFERENCES:
patent: 4090589 (1978-05-01), Fitzwater
patent: 4113063 (1978-09-01), Troy
patent: RE30135 (1979-11-01), Fitzwater et al.
patent: 4289038 (1981-09-01), Hore
patent: 5915668 (1999-06-01), Hodapp et al.
patent: 6276664 (2001-08-01), Keller
patent: 6431317 (2002-08-01), Coe
patent: 6572076 (2003-06-01), Appleford et al.
patent: 7182310 (2007-02-01), Chen
patent: 7377479 (2008-05-01), Chen
patent: 51062421 (1976-05-01), None
patent: 54161117 (1979-12-01), None

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