Motor-operated valve

Details Motor-operated valve Motor-operated valve

2005-08-02

2005-08-02

Keasel, Eric (Department: 3754)

Valves and valve actuation

Electrically actuated valve

Rotary electric actuator

C251S077000

Reexamination Certificate

active

06923427

ABSTRACT:
A valve spindle is provided with a screw thread part which meshes with a valve body to move the valve spindle forwards and backwards. Provided between a rotation driving member and the valve spindle is an interlocking part which transmits a force of rotation of the driving member to the valve spindle and allows the valve spindle's forward and backward movement following its rotation. A bring-back preventing part is provided at a location continuous with the interlocking part to prevent movement of the valve spindle in response to rotation of the driving member in the direction of opening the valve on the basis of exciting pulses excessively supplied to the stepping motor during a valve closing operation.

REFERENCES:
patent: 3080952 (1963-03-01), Carlstedt
patent: 3488030 (1970-01-01), Hulme et al.
patent: 4556193 (1985-12-01), Yoshiga
patent: 4911404 (1990-03-01), Dorste et al.
patent: 5249775 (1993-10-01), Tabatabai
patent: 5364066 (1994-11-01), Dorste et al.
patent: 5419531 (1995-05-01), Hoehn
patent: 5851003 (1998-12-01), Aoki et al.
patent: 4-10532 (1992-03-01), None
patent: 6-174129 (1994-06-01), None
patent: 8-49782 (1996-02-01), None

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