Partial stroke testing system coupled with fuel control valve

Details Partial stroke testing system coupled with fuel control valve Partial stroke testing system coupled with fuel control valve

2008-02-28

2011-12-13

Williams, Hezron E (Department: 2856)

Measuring and testing

Blower, pump, and hydraulic equipment

Reexamination Certificate

active

08074512

ABSTRACT:
A system for on-line testing of an emergency shut-off valve includes a first emergency shut-off valve and a control for initiating a test on the first emergency shut-off valve. The system also includes a fluid actuator for opening and closing the first emergency shut-off valve. A subsystem is also provided for testing the first emergency shut-off valve without fully closing the shut-off valve in response to a signal from the control. In this system, a second solenoid valve bleeds off pressurized fluid to move the emergency shut-off valve from a fully opened to a partially closed position functions as a second emergency shut-off valve. A second emergency shut-off valve is also provided in series with the first emergency shut-off valve and a bypass around the second emergency shut-off valve allows the second emergency shut-off valve to be tested by being fully closed without shutting down the process. The use of the two emergency shut-off valves in series wherein either valve can shut down the process raises the safety integrity level to level 3.

REFERENCES:
patent: 4025222 (1977-05-01), Hedstrom et al.
patent: 4103592 (1978-08-01), Davis
patent: 5680753 (1997-10-01), Hollinger et al.
patent: 6244034 (2001-06-01), Taylor et al.
patent: 6435022 (2002-08-01), Albuaijan
patent: 6935610 (2005-08-01), DeBruyne
patent: 2006/0012089 (2006-01-01), Beck

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