Motor-operated valve

Details Motor-operated valve Motor-operated valve

2007-01-23

2007-01-23

Jacyna, J. Casimer (Department: 3751)

Valves and valve actuation

Electrically actuated valve

Rotary electric actuator

Reexamination Certificate

active

11209443

ABSTRACT:
A motor-operated valve comprising a valve stem having a valve plug; a valve body having a valve seat with which the valve plug is enabled to removably contact; a can fixed to the valve body; a rotor disposed coaxially in the can; a stator disposed around an outer circumferential surface of the can; a guide bush fixedly secured to the valve body and having an axial hollow portion in which the valve stem is permitted to slidably move; and a valve stem holder; wherein the valve stem is enabled to rotate integral with the valve stem holder and to move in the longitudinal direction thereof relative to the valve stem holder. The motor-operated valve is further provided with a flow rate adjusting feed screw mechanism which is constituted by a first stationary threaded portion and a first movable threaded portion; and with a rotation regulating feed screw mechanism which is constituted by a second stationary threaded portion and a second movable threaded portion. The pitch of the flow rate adjusting feed screw mechanism is made smaller than the pitch of the rotation regulating feed screw mechanism.

REFERENCES:
patent: 4412517 (1983-11-01), Kobashi et al.
patent: 4948091 (1990-08-01), Satoh et al.
patent: 6224034 (2001-05-01), Kato et al.
patent: 6325055 (2001-12-01), Yokoyama et al.
patent: 0361539 (1990-04-01), None
patent: 61 099782 (1986-05-01), None
patent: 61 103077 (1986-05-01), None
patent: 2001-050415 (2001-02-01), None

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