Gas shut-off valve with feedback

Details Gas shut-off valve with feedback Gas shut-off valve with feedback

F - Mech Eng,Light,Heat,Weapons

17

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F17D 5/00 (2006.01) F16K 31/04 (2006.01) F16K 37/00 (2006.01) F17D 1/00 (2006.01) F17D 3/00 (2006.01) G01F 15/06 (2006.01) G01F 25/00 (2006.01) G08C 17/02 (2006.01)

Patent

CA 2716046

Disclosed are apparatus and methodology for providing a feedback mechanism to a system operator that provides a positive indication of the position of a valve which controls gas flow to a consumer. Rotation of a stepper motor controlling a valve mechanism is optically monitored and a feedback signal is sent to the system operator indicating positive operation of the valve only when a selected number of rotations of the stepper motor is reported. The stepper motor may be operated in different modes, each associated with different nominal current consumption levels. In a higher current consumption mode, such as a torque--oriented mode, the stepper motor may be stepped a few additional steps after valve closure to ensure seating of the valve.

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