Torque measuring method and apparatus for motor-operated valve

Details Torque measuring method and apparatus for motor-operated valve Torque measuring method and apparatus for motor-operated valve

2005-06-23

2010-06-22

Caputo, Lisa M (Department: 2855)

Measuring and testing

Dynamometers

Responsive to torque

Reexamination Certificate

active

07739923

ABSTRACT:
A torque measuring method and apparatus for a motor-operated valve including a valve driving mechanism operable to open and close the valve, a worm displacable by driving of the motor to operate the valve driving mechanism, and a spring cartridge having a plurality of belleville springs and disposed coaxially with the worm for compression by the worm. The method comprises obtaining basic data representing a relationship between the amounts of compression of the belleville springs and the torques exerted, measuring a displacement of the worm or the spring cartridge and acquiring, from the thus obtained displacement of the worm or the spring cartridge, a real amount of compression of the belleville springs in which an influence of a play of the spring cartridge has been removed, and substituting the real amount of compression for the amount of compression of the basic data to acquire a real torque corresponding to the real amount of compression.

REFERENCES:
patent: 4111070 (1978-09-01), Stratienko
patent: 4130030 (1978-12-01), Stratienko
patent: 4805451 (1989-02-01), Leon
patent: 5224512 (1993-07-01), Nogami et al.
patent: 5594175 (1997-01-01), Lyon et al.
patent: 5836567 (1998-11-01), Watanabe
patent: 05-172663 (1993-07-01), None
patent: WO 2004/081436 (2004-09-01), None

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