Power operated valve stem thrust verification test system

Details Power operated valve stem thrust verification test system Power operated valve stem thrust verification test system

1991-03-06

1992-12-29

Yasich, Daniel M.

Measuring and testing

Blower, pump, and hydraulic equipment

364510, G01M 1900

Patent

active

051741520

ABSTRACT:
A method and apparatus for inducing a controlled, axial load on the stem of a rising-stem, power-operated valve; and for testing the operator response in driving the valve stem against the load. The induced load is controlled both in magnitude and rate while data is collected to determine the operator's mechanical efficiency and its stem load handling capability. The methods, apparatus, and data collected can be used both for intial operator testing and for a periodic test and surveillance program for installed valve operators.

REFERENCES:
patent: 4570903 (1986-02-01), Crass
patent: 4693113 (1987-09-01), McNennamy et al.
patent: 4694390 (1987-09-01), Lee
patent: 4831873 (1989-05-01), Clarbonneau et al.
patent: 4869102 (1989-09-01), Hale et al.
patent: 5033012 (1991-07-01), Wohld

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