Motor-operated valve

Details Motor-operated valve Motor-operated valve

1990-02-16

1990-08-14

Walton, George L.

Valves and valve actuation

Permanent or constantly energized magnet actuator

25112911, 2511292, 25112921, 251267, 251229, F16K 3108

Patent

active

049480910

ABSTRACT:
A motor-operated valve is constructed such that a stator is provided outside of a nonmagnetic tubular member allowing flow of a fluid, with stator coils wound around a plurality of magnetic poles, and a plurality of permanent magnets are secured to an operating surface of each magnetic pole. The permanent magnets are magnetized into a number of pole-pairs arranged at a constant pitch. A rotor is rotatably supported inside of the tubular member. A number of induction teeth are formed along the circumference of the rotor at a pitch equal to the pitch of the pole-pairs of the permanent magnets, and the total number of the induction teeth is so selected that it is different from the total number of the pole-pairs of the permenant magnets by an amount equal to an even number. A mechanism including a rotation-preventing means is also provided in the rotor for converting the rotating movement of the rotor into a linear movement of a valve member.

REFERENCES:
patent: 2533491 (1950-12-01), McMahon et al.
patent: 2589188 (1952-03-01), DeCraene et al.
patent: 3355140 (1967-11-01), Andersen
patent: 3977436 (1976-08-01), Larner
patent: 4274444 (1981-06-01), Ruyak
patent: 4412517 (1983-11-01), Kobashi et al.
patent: 4452423 (1984-06-01), Beblavi et al.
patent: 4650156 (1987-03-01), Kawahira
patent: 4664355 (1987-05-01), Kubach
patent: 4723753 (1988-02-01), Torimoto
patent: 4789132 (1988-12-01), Fujita et al.

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