Partial stroke valve test apparatus

Details Partial stroke valve test apparatus Partial stroke valve test apparatus

2005-08-30

2005-08-30

Yu, Justine R. (Department: 3751)

Valves and valve actuation

With means for blocking or disabling actuator

Attachments

C251S100000

Reexamination Certificate

active

06935610

ABSTRACT:
A partial stroke valve testing apparatus is operably inserted between an emergency shutdown valve and a valve actuator, and comprises a drive cam attached to a drive shaft interconnecting the valve and actuator and an engagement cam attached to an engagement shaft which can be rotated from an operational position to a testing position to bring the engagement cam into operable communication with the drive cam. A key is locked to the engagement shaft to rotate the engagement shaft, and can be removed only when the engagement shaft is in the operational position. A safety stop mechanism prevents the engagement shaft from inadvertently rotating out of the operational and testing positions. A spring-biased pin engages radially-spaced detent seats in the engagement shaft to provide a positive indication of the position of the engagement shaft.

REFERENCES:
patent: 5190263 (1993-03-01), Roberts
patent: 5329959 (1994-07-01), Owen et al.
patent: 5469737 (1995-11-01), Smith et al.

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