High torque failsafe valve operator

Details High torque failsafe valve operator High torque failsafe valve operator

2006-04-18

2006-04-18

Keasel, Eric (Department: 3753)

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

C137S625210, C137S625650, C251S067000, C251S250000, C251S129120, C251S077000

Reexamination Certificate

active

07028705

ABSTRACT:
A fluid valve operator for moving a moveable valve element such as a disc (14) that is pressed forcefully against a surface of a valve frame (12). The valve operator includes first and second electric gear reduction motors (22, 24) that each has a movable driving member such as a rack (34, 36) that moves against a handle (20) of the valve element to move the valve element to a connect or disconnect position. Each motor withdraws its driving member from the valve member handle after moving the valve member. A default mechanism (90) moves the valve element handle to a preselected one of the positions, such as the disconnect position, when pressure of a fluid falls below a preselected level.

REFERENCES:
patent: 476573 (1892-06-01), Stout
patent: 558256 (1896-04-01), Bush
patent: 2318010 (1943-05-01), Panish
patent: 3056573 (1962-10-01), Matheson et al.
patent: 3261266 (1966-07-01), Hyman et al.
patent: 4225110 (1980-09-01), Akkerman et al.
patent: 4657222 (1987-04-01), Tullio
patent: 4741365 (1988-05-01), Van Ornum
patent: 5310021 (1994-05-01), Hightower

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