Damped check valve having multi-pressure operation

Patent metadata

Field	Value
Publication number	US-11603940-B2
Application number	US-201815951991-A
Country	US
Kind code	B2
Filing date	Apr 12, 2018
Priority date	Apr 12, 2018
Publication date	Mar 14, 2023
Grant date	Mar 14, 2023

Abstract

A damped check valve having multi-pressure operation is provided. The check valve includes a liner with a poppet movable within the liner. The liner defines a flow passage aligned along a longitudinal axis defined by the liner. A biasing element is operably coupled between the poppet and the liner to bias a first flow face of the poppet against an annular seat. The first flow face is configured such that a first fluid pressure is required to move the poppet from the closed position to an open position wherein the poppet is unseated from the annular seat and a second fluid pressure is required to hold the poppet in the open position, the second pressure being less than the first pressure. There is a sufficient diametrical clearance between the poppet and the liner which allows for flow control at pressures which are less than the initial opening pressure.

First claim

What is claimed is:

1. A check valve, comprising:
a liner, the liner defining a flow passage aligned along a longitudinal axis defined by the liner and having a radial wall forming a plurality of outlet grooves between a plurality of extensions at an outlet portion thereof;
a poppet, the poppet having a first flow face and a second flow face and an axially extending sidewall interposed between the first flow face and the second flow face;
a biasing element operably coupled between the poppet and the liner to bias the first flow face against an annular seat defined by the liner in a closed position; and
wherein the first flow face is configured such that a first fluid pressure is required to move the poppet from the closed position to an open position wherein the poppet is unseated from the annular seat and a second fluid pressure is required to hold the poppet in the open position, the second pressure being less than the first pressure; and
wherein a radial clearance is defined between the axially extending sidewall of the poppet and the radial wall of an outlet portion of the liner such that a controlled leakage flow is permitted from the outlet portion past the axially extending sidewall and out of the outlet grooves once the poppet has unseated from the annular seat.

2. The check valve of claim 1 , wherein the flow passage has an inlet portion, and wherein the outlet portion is downstream from the inlet portion relative to a direction of the flow of fluid through the flow passage.

3. The check valve of claim 2 , wherein the poppet is movable from the closed position to the open position wherein the poppet is unseated from the annular seat and from the open position to a full open position, wherein in the full open position an entirety of the axially extending sidewall is downstream relative to the direction of fluid flow through the flow passage from a downstream edge of the outlet portion.

4. The check valve of claim 1 , wherein a first portion having a first area of the first flow face is arranged such that fluid will contact said first portion in the closed position, and wherein a second portion of the first flow face having a second area greater than the first area is arranged such that fluid will contact said second portion when the poppet is unseated from the annular seat in the open position.

5. The check valve of claim 1 , further comprising a seal, the seal situated in the poppet such that a portion of the seal is exposed on the first flow face.

6. A check valve, comprising:
a liner, the liner defining a flow passage aligned along a longitudinal axis defined by the liner and having a radial wall forming a plurality of outlet grooves between a plurality of extensions at an outlet portion thereof;
a poppet, the poppet having a first flow face and a second flow face and an axially extending sidewall interposed between the first flow face and the second flow face;
a biasing element operably coupled between the poppet and the liner to bias the first flow face against an annular seat defined by the liner in a closed position; and
wherein a first portion having a first area of the first flow face is arranged such that fluid will contact said first portion in the closed position, and wherein a second portion of the first flow face having a second area greater than the first area is arranged such that fluid will contact said second portion when the poppet is unseated from the annular seat in an open position; and
wherein a radial clearance is defined between the axially extending sidewall of the poppet and the radial wall of an outlet portion of the liner such that a controlled leakage flow is permitted from the outlet portion past the axially extending sidewall and out of the outlet grooves once the poppet has unseated from the annular seat.

7. The check valve of claim 6 , wherein the flow passage has an inlet portion, and wherein the outlet portion is downstream from the inlet portion relative to a direction of the flow of fluid through the flow passage.

8. The check valve of claim 7 , wherein the poppet is movable from the closed position to the open position wherein the poppet is unseated from the annular seat and from the open position to a full open position, wherein in the full open position an entirety of the axially extending sidewall is downstream relative to the direction of fluid flow through the flow passage from a downstream edge of the outlet portion.

9. The check valve of claim 7 , wherein the inlet portion of the flow passage has a first diameter and the outlet portion of the flow passage has a second diameter greater than the first diameter.

10. The check valve of claim 6 , wherein the first flow face is configured such that a first fluid pressure is required to move the poppet from the closed position to the open position wherein the poppet is unseated from the annular seat and a second fluid pressure is required to hold the poppet in the open position, the second pressure being less than the first pressure.

11. The check valve of claim 6 , further comprising a retainer affixed to the poppet, the biasing element trapped between the retainer and the liner.

12. The check valve of claim 6 , wherein a plurality of inlet ports are formed through the liner such that fluid surrounding an exterior of the liner is in communication with the flow passage via the plurality of inlet ports.

13. A check valve, comprising:
a liner, the liner defining a flow passage aligned along a longitudinal axis defined by the liner, the flow passage having an inlet portion and an outlet portion downstream from the inlet portion relative to the direction of the flow of fluid through the flow passage, and the liner further having a radial wall forming a plurality of outlet grooves between between a plurality of extensions at an outlet portion thereof;
a poppet, the poppet having a first flow face and a second flow face, wherein an axially extending sidewall of the poppet is interposed between the first and second flow faces;
a biasing element operably coupled between the poppet and the liner to bias the first flow face against an annular seat defined by the liner in a closed position of the check valve;
wherein the poppet is movable from the closed position to an open position wherein the poppet is unseated from the annular seat and from the open position to a full open position, wherein in the full open position an entirety of the axially extending sidewall is downstream relative to the direction of fluid flow through the flow passage from a downstream edge of the outlet portion; and
wherein a radial clearance is formed between the axially extending sidewall and the outlet portion of the flow passage such that a leakage flow is permitted from the inlet portion through the outlet portion in the open position.

14. The check valve of claim 13 , wherein a portion of the inlet portion of the flow passage is a variable volume damping cavity formed between a first damping face of the poppet and a second damping face of the liner, wherein a volume of the damping cavity varies based on a position of the poppet within the liner.

15. The check valve of claim 14 , wherein a radial clearance is formed between the first damping face and the inlet portion of the flow passage such that a leakage flow is permitted from the damping cavity to the remainder of the inlet portion of the flow passage.

16. The check valve of claim 13 , wherein the first flow face is configured such that a first fluid pressure is required to move the poppet from the closed position to the open position wherein the poppet is unseated from the an

Assignees

• Mccormack Jimroy Arner
• Woodward Inc

Inventors

• Mccormack Jimroy Arner

Classifications

• F02C7/22 Primary

  Fuel supply systems · CPC title

• F16K17/025 Primary

  and remaining open after return of the normal pressure · CPC title

• Y10T137/7932

  Valve stem extends through fixed spring abutment · CPC title

• Y10T137/7933

  Yoke or cage-type support for valve stem · CPC title

• Y10T137/7929

  Spring coaxial with valve · CPC title