Motor-operated valve apparatus

Details Motor-operated valve apparatus Motor-operated valve apparatus

2007-01-30

2007-01-30

Look, Edward K. (Department: 3751)

Valves and valve actuation

Biased trip

Electrical trip actuation

C251S129110, C431S006000

Reexamination Certificate

active

11076491

ABSTRACT:
When a fluid flow channel is interrupted while an electronic circuit unit50including a microcomputer51and the like receives electric source power, a flow control valve is displaced to a predetermined position closer to a first end of both ends of a motion range of the flow control valve in the fluid flow channel by a stepping motor29. When the supply of electric source power is restarted after the supply of electric source power to the electronic circuit unit50is stopped, a predetermined number of pulses capable of displacing the flow control valve from the first end to a home position are supplied to the stepping motor29to displace the flow control valve to the home position with a second end of both ends of the motion range of the flow control valve being the home position of the flow control valve. Thus, the flow control valve is shifted to the home position while preventing occurrence of a disorder of the stepping motor, abnormal sounds and vibrations, in a simple configuration, without requiring means for detecting arrival of the flow control valve at the home position.

REFERENCES:
patent: 4771643 (1988-09-01), Mott
patent: 5085574 (1992-02-01), Wilson
patent: 6619613 (2003-09-01), Akamatsu et al.
patent: 1 152 190 (2001-11-01), None
patent: 62-244300 (1987-10-01), None
patent: 06-213348 (1994-08-01), None
patent: 2003-254534 (2003-09-01), None
patent: 2003-329698 (2003-11-01), None

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