In situ method of determining the thrust on valve components

Details In situ method of determining the thrust on valve components In situ method of determining the thrust on valve components

1991-07-26

1993-06-22

Noland, Tom

Measuring and testing

Dynamometers

Responsive to torque

73 1B, 73168, 7386249, 25112904, G01L 522, G01L 2500

Patent

active

052208435

ABSTRACT:
Without disassembling a valve stem from a valve, the valve is decoupled from a valve actuator such that the valve stem and attached valve disc or body may shift to and from a seated position without interference by the actuator. Known loads are applied to the decoupled valve stem to cause a strain gauge output which corresponds to the known load. The strain gauge is mounted to the valve stem or other force reactive components of the valve which react by changing in dimension in response to the applied known load. The relationship of the applied load to the strain gauge output is determined to thereby calibrate the valve stem. The load is removed and the valve stem is recoupled to the valve actuator for operation. From the strain gauge output during either or both static and dynamic operation of the valve, the thrust on the valve stem is directly obtained and is used to evaluate the performance of the valve and actuator.

REFERENCES:
patent: 2216563 (1940-10-01), Cartier
patent: 2598062 (1952-05-01), Krecan
patent: 3657926 (1972-04-01), Munson et al.
patent: 4177825 (1979-12-01), Crawford
patent: 4349885 (1982-09-01), Thompson
patent: 4570903 (1986-02-01), Crass
patent: 4633702 (1987-01-01), Kaiser et al.
patent: 4977782 (1990-12-01), Stohr et al.
Pages 2-5 of an Inspection Report published with a letter dated May 24, 1991 to Mr. Richard H. Tuft, President, Liberty Technologies, Conshohocken, Pa.
Pages 2-8 of an Inspection Report published with a letter dated May 24, 1991 to Mr. Don L. Janececk, President, ITI MOVATS, Kennesaw, Ga.

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