Reverse flow relief valve

Patent metadata

Field	Value
Publication number	US-9273795-B2
Application number	US-201313915783-A
Country	US
Kind code	B2
Filing date	Jun 12, 2013
Priority date	Jun 12, 2013
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A bleed valve system includes a bleed valve, a valve regulator, a valve actuator and a reverse flow relief valve. The bleed valve is opened and closed to control a flow of bleed air from an upstream inlet to a downstream outlet. The valve regulator provides a servo pressure used to regulate the position of the bleed valve, and the valve actuator is mechanically connected to open/close the bleed valve based on the servo pressure provided by the valve regulator. The reverse flow relief valve compares a pressure upstream of the bleed valve to a pressure downstream of the bleed valve and in response to the downstream pressure exceeding the upstream pressure creates a fluid communication path between the servo pressure and an ambient pressure to decrease the servo pressure such that the bleed valve is closed.

First claim

The invention claimed is:

1. A reverse flow relief valve comprising:
a housing defined by first, second, third, and fourth fluid inlets, and a first chamber and a second chamber;
a first stationary member located within the second chamber that fits within the second chamber to provide a seal between the first chamber and the second chamber;
a second stationary member located within the second chamber adjacent to the first stationary member, the second stationary member having an interior chamber and a passage that places the fourth fluid inlet in fluid communication with the interior chamber;
a poppet mechanism that includes a ball, stem and poppet member, wherein the ball is located in the first chamber such that the first inlet is in fluid communication with a first side of the ball and the second inlet is in fluid communication with a second side of the ball, wherein the ball is actuated axially between a first position and a second position based on the relative pressures provided at the first inlet and the second inlet, wherein the stem extends through the first stationary member and the second stationary member and the poppet member forms a seal with the second stationary member when the ball is in a first position and provides a fluid communication path between the third inlet and the fourth inlet via the interior chamber of the second stationary member when the ball is in a second position.

2. The reverse flow relief valve of claim 1 , wherein the first and second stationary members, the ball, and the stem member are metal and/or ceramic.

3. The reverse flow relief valve of claim 1 , wherein the first and second stationary members are press-fit within the housing.

4. The reverse flow relief valve of claim 1 , wherein the housing includes a first seat portion that receives the ball when the ball is actuated toward the second inlet.

5. The reverse flow relief valve of claim 4 , wherein the first seat portion forms a seal between a left-side of the ball and a right-side of the ball when the ball is actuated against the first seat portion.

6. The reverse flow relief valve of claim 1 , wherein the first stationary member includes a second seat member that receives the ball when the ball is actuated toward the first inlet.

7. The reverse flow relief valve of claim 6 , wherein the seat member forms a seal between the left-side of the ball and a right-side of the ball when the ball is actuated against the second seat member.

8. A bleed valve system comprising:
a bleed valve that is opened and closed to control a flow of bleed air from an upstream inlet to a downstream outlet;
a valve regulator that provides a servo pressure used to regulate the position of the bleed valve;
a valve actuator mechanically connected to open/close the bleed valve based on the servo pressure provided by the valve regulator; and
a reverse flow relief valve that compares a pressure upstream of the bleed valve to a pressure downstream of the bleed valve and in response to the downstream pressure exceeding the upstream pressure creates a fluid communication path between the servo pressure and an ambient pressure to decrease the servo pressure and cause the valve actuator to close the bleed valve.

9. The bleed valve system of claim 8 , wherein the reverse flow relief valve includes:
a housing defined by first, second, third, and fourth fluid inlets, and a first chamber and a second chamber, wherein the first fluid inlet is connected to the upstream pressure, the second fluid inlet is connected to the downstream pressure, the third fluid inlet is connected to the servo pressure, and the fourth fluid inlet is connected to the ambient pressure;
a first stationary member located within the second chamber that fits within the second chamber to provide a seal between the first chamber and the second chamber;
a second stationary member located within the second chamber adjacent to the first stationary member, the second stationary member having an interior chamber and a passage that places the fourth fluid inlet in fluid communication with the interior chamber;
a poppet valve mechanism that includes a ball, stem and poppet member, wherein the ball is located in the first chamber such that the first inlet is in fluid communication with a first side of the ball and the second inlet is in fluid communication with a second side of the ball, wherein the ball is actuated axially between a first position and a second position based on the relative pressures provided at the first inlet and the second inlet, wherein the stem extends through the first stationary member and the second stationary member and the poppet member forms a seal with the second stationary member when the ball is in a first position and provides a fluid communication path between the third inlet and the fourth inlet via the interior chamber of the second stationary member when the ball is in a second position.

10. The bleed valve system of claim 9 , wherein the first and second stationary members, the ball, and the stem member are metal and/or ceramic.

11. The bleed valve system of claim 9 , wherein the first and second stationary members are press-fit within the housing.

12. The bleed valve system of claim 9 , wherein the housing includes a first seat portion that receives the ball when the ball is actuated toward the second inlet.

13. The bleed valve system of claim 12 , wherein the first seat portion forms a seal between a left-side of the ball and a right-side of the ball when the ball is actuated against the first seat portion.

14. The bleed valve system of claim 9 , wherein the first stationary member includes a second seat member that receives the ball when the ball is actuated toward the first inlet.

15. The bleed valve system of claim 14 , wherein the seat member forms a seal between the left-side of the ball and a right-side of the ball when the ball is actuated against the second seat member.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Kamp Josh
• Simpson Scott W
• Dehais John M

Classifications

• F16K31/1245 Primary

  with more than one valve · CPC title

• Y10T137/7759

  Responsive to change in rate of fluid flow · CPC title

• F02C9/18 Primary

  by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages {(F02C3/113 takes precedence)} · CPC title