Fluid valve and opening motion promoting device
AssigneeNabtesco Corporation
InventorKoji Ito
Life of this patent
Estimating the term…
Abstract
A fluid valve has a valve plug configured as follows. In order to control a flow rate of a fluid between a first pressure chamber and a second pressure chamber, the valve plug is provided so as to be openable and closable in accordance with a difference between forces generated by pressures in the pressure chambers and resilience of an elastic member. The fluid valve includes an opening motion promoting portion. The opening motion promoting portion promotes an increase in degree of opening of the valve plug after the valve plug has been opened.
Claims8
A fluid valve, comprising:
- a valve plug provided so as to be openable and closable in accordance with a difference between forces generated by a pressure in a first pressure chamber and a pressure in a second pressure chamber and resilience of an elastic member, in order to control a flow rate of a fluid between the first pressure chamber and the second pressure chamber;
- and
- an opening motion promoter configured to promote an increase in degree of opening of the valve plug after the valve plug has been opened,
- wherein the opening motion promoter is configured to apply, to the valve plug, a force in an opening direction of the valve plug,
- wherein the valve plug includes a circulation path connecting the first pressure chamber to the second pressure chamber, the circulation path being closed by a valve seat,
- wherein the opening motion promoter includes a pressure reservoir configured to temporarily store a fluid flowing into the circulation path of the valve plug so as to increase a pressure for pushing the valve plug,
- further comprising:
- a flow rate adjuster configured to restrict a flow rate of the fluid in a flow path through which the fluid flows out of the pressure reservoir,
- wherein each one of the valve plug and the valve seat is openable and closable with respect to the other, and
- wherein, when the fluid flows from outside the pressure reservoir into the pressure reservoir as the valve seat is opened, the flow rate adjuster relaxes restriction on the flow rate in the flow path of the pressure reservoir,
- wherein the pressure reservoir includes an inner wall for storing the fluid flowing from the second pressure chamber near the valve seat into the first pressure chamber near the valve plug,
- wherein the inner wall includes:
- a circumferential wall surrounding at least part of the valve plug;
- and
- a movable wall extending from the valve plug and disposed so as to overlap with the circumferential wall, and
- wherein the flow rate adjuster is provided in at least one of the circumferential wall and the movable wall.
An opening motion promoter that promotes opening of a valve plug included in a fluid valve, the valve plug being provided so as to be openable and closable in accordance with a difference between forces generated by a pressure in a first pressure chamber and a pressure in a second pressure chamber and resilience of an elastic member, in order to control a flow rate of a fluid between the first pressure chamber and the second pressure chamber,
- wherein the opening motion promoter configured to promote an increase in degree of opening of the valve plug after the valve plug has been opened,
- wherein the opening motion promoter configured to apply, to the valve plug, a force in an opening direction of the valve plug,
- wherein the valve plug includes a circulation path connecting the first pressure chamber to the second pressure chamber, the circulation path being closed by a valve seat,
- wherein the opening motion promoter includes a pressure reservoir configured to temporarily store a fluid flowing into the circulation path of the valve plug so as to increase a pressure for pushing the valve plug,
- further comprising:
- a flow rate adjuster configured to restrict a flow rate of the fluid in a flow path through which the fluid flows out of the pressure reservoir,
- wherein each one of the valve plug and the valve seat is openable and closable with respect to the other, and
- wherein, when the fluid flows from outside the pressure reservoir into the pressure reservoir as the valve seat is opened, the flow rate adjuster relaxes restriction on the flow rate in the flow path of the pressure reservoir,
- wherein the pressure reservoir includes an inner wall for storing the fluid flowing from the second pressure chamber near the valve seat into the first pressure chamber near the valve plug,
- wherein the inner wall includes:
- a circumferential wall surrounding at least part of the valve plug;
- and
- a movable wall extending from the valve plug and disposed so as to overlap with the circumferential wall, and
- wherein the flow rate adjuster is provided in at least one of the circumferential wall and the movable wall.
Dependencies are inferred from the claim text.