Flow Control Valve
AssigneeAisan Kogyo Kabushiki Kaisha
InventorShinji MURAl
Life of this patent
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Abstract
A flow control valve includes a housing having a valve chamber, an inlet port, an outlet port, and a valve seat. In addition, the flow control valve includes a valve body disposed in the valve chamber, an actuator having an output rotational shaft, a feed screw mechanism to convert forward and reverse rotational motion of the output rotational shaft to axial reciprocating motion of the valve body, a backlash preventive spring positioned between the housing and the valve body, and a spring supporting device formed on the housing and having a spring seating surface. The spring seating surface is spaced from the valve seat in an opening direction of the valve body.
Claims3
A flow control valve, comprising:
- a housing including a valve chamber, an inlet port extending from the valve chamber, an outlet port extending from the valve chamber, and a valve seat;
- a valve body disposed in the valve chamber and configured to move axially to close and open the valve seat;
- an actuator including a rotatable output shaft;
- a feed screw mechanism configured to convert a forward and a reverse rotational motion of the output rotational shaft to an axial reciprocation of the valve body;
- a backlash preventive spring comprising a coil spring positioned between the housing and the valve body, wherein the backlash preventive spring is configured to bias the valve body in a direction to prevent backlash of the feed screw mechanism;
- and
- a spring supporting device formed on the housing,
- wherein the spring support device includes a spring seating surface configured to contact and receive a coil end of the backlash preventive spring, and
- wherein the spring seating surface is spaced from the valve seat in an opening direction of the valve body in an axial direction of the valve chamber.
Dependencies are inferred from the claim text.