Auxiliary automatic valve shut-off system

Valves and valve actuation – Electrically actuated valve – With nonelectrical actuator

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Details

25112913, 318466, F16K 3102

Patent

active

055886370

ABSTRACT:
A shut-off system for a filling/dispensing valve of a compressed gas cylinder includes an electric motor that rotates the valve stem through a clutch. The clutch operatively couples the motor to the stem to allow the stem to be either motor-turned or manually-turned only in the valve-closing direction, and selectively decouples the motor from the stem to allow manual rotation of the stem in either direction. An actuation signal is fed to a microprocessor to turn the motor on in response to a predetermined condition. During motor operation, a voltage sensor generates a control signal having a value indicative of the voltage across the switch, which value is inputted to the microprocessor. The microprocessor has a stored value representing the resistance across the closed switch, and it thus can compute the instantaneous value of the current drawn by the motor, which is periodically compared with a stored maximum current value. As the valve begins to abut against the valve seat, the motor torque required for further incremental rotation of the valve stem increases abruptly, thereby causing a correspondingly abrupt increase in the current drawn by the motor. When this abrupt increase in motor current exceeds the stored maximum current value, the microprocessor generates a second switching signal after a short delay, opening the switch to turn the motor off.

REFERENCES:
patent: 2550906 (1951-05-01), Britton
patent: 4220313 (1980-09-01), Petersen et al.
patent: 4541609 (1985-02-01), Smith
patent: 4647007 (1987-03-01), Bajka
patent: 4754949 (1988-07-01), Fukamachi
patent: 4760989 (1988-08-01), Elliott et al.
patent: 4790514 (1988-12-01), Marks
patent: 4845416 (1989-07-01), Scholl et al.
patent: 4875623 (1989-10-01), Garris
patent: 4889315 (1989-12-01), Imanaga
patent: 5372351 (1994-12-01), Oliver
"Emergency Shut Off Facilities for Tank Car and Tank Truck Transfer of Chlorine", The Chlorine Institute, Inc., (Pamphlet #57A) Ediition 2, May 1989.
"Automated Chlorine Cylinder Block Valve", -Powell Fabrication & Manufacturing, Inc., undated.

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