Valves and valve actuation – Electrically actuated valve – With nonelectrical actuator
Patent
1995-05-30
1996-12-31
Nguyen, Hoang
Valves and valve actuation
Electrically actuated valve
With nonelectrical actuator
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.
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"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.
Carsten Robert L.
Wilberger Bernard E.
Carsten Robert L.
Nguyen Hoang
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