Flow control valve

Details Flow control valve Flow control valve

1996-06-14

1998-06-23

Lee, Kevin

Valves and valve actuation

Electrically actuated valve

Rotary electric actuator

25112905, F16K 3104

Patent

active

057693900

ABSTRACT:
A valve is connected to a valve stem, and is closed by the elastic force of a spring acting on it via the valve stem. The valve is opened, on the other hand, when a stepping motor displaces the valve stem coaxially against the force of the spring via a rotor shaft. A predetermined clearance D is set between the rotor shaft in a predetermined position and the valve stem in a seating position. When a fault is detected in the closing of the valve, the rotor shaft is displaced beyond this clearance D so as to directly drive the valve stem in the valve closing direction and thereby close the valve forcibly without the agency of the spring.

REFERENCES:
patent: 4742989 (1988-05-01), Akagi
patent: 5351935 (1994-10-01), Miyoshi et al.
patent: 5503131 (1996-04-01), Ohuchi
patent: 5579743 (1996-12-01), Kadowski

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