Dynamic valve seal having retaining features

Patent metadata

Field	Value
Publication number	US-9765894-B2
Application number	US-201514605062-A
Country	US
Kind code	B2
Filing date	Jan 26, 2015
Priority date	Jan 26, 2015
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A dynamic seal assembly is disclosed for use in a valve having an upstream pressure side and a downstream pressure side, the dynamic seal assembly including an annular seal member having a generally C-shaped cross-section and including opposed upstream and downstream legs defining an internal cavity with an opening facing toward the upstream pressure side of the valve, wherein the upstream leg has a radial length that is greater than a radial length of the downstream leg and includes a retaining foot that extends angularly away from the upstream leg in an upstream direction at an angle of between about 0° and 90°, and a metallic spring is disposed within the internal cavity of the seal member for providing a constant sealing force to the seal member.

First claim

What is claimed is:

1. A valve assembly for a fuel injector comprising:
a) a sleeve member having an interior chamber;
b) a piston member supported for movement within the interior chamber of the sleeve member and delimiting an upstream pressure side of the valve assembly and a downstream pressure side of the valve assembly;
c) a dynamic sealing device mounted to one of the sleeve member and the piston member for sealingly isolating the upstream pressure side of the valve assembly from the downstream pressure side of the valve assembly, the dynamic sealing assembly including:
i) an annular seal member having a generally C-shaped cross-section including opposed upstream and downstream legs defining an internal cavity with an opening facing inward from an inner periphery of the seal member, the opening facing toward the upstream pressure side of the valve assembly, wherein the upstream leg has a radial length that is greater than a radial length of the downstream leg; and
ii) a spring member disposed within the internal cavity of the seal member for providing a constant sealing force to the seal member.

2. A valve assembly as recited in claim 1 , wherein the seal member is mounted to the piston member, and wherein the upstream leg of the seal member includes a retaining foot that extends angularly away from the upstream leg in an upstream direction.

3. A valve assembly as recited in claim 2 , wherein the retaining foot extends angularly away from the upstream leg of the seal member at an angle of between about 0° and 90°.

4. A valve assembly as recited in claim 1 , wherein the sleeve member and piston member are adapted and configured to operate as a check valve.

5. A valve assembly as recited in claim 1 , wherein the sleeve member and piston member are adapted and configured to operate as a schedule valve.

6. A valve assembly as recited in claim 1 , wherein the sleeve member and piston member are adapted and configured to operate as a combined check valve and schedule valve.

7. A valve assembly as recited in claim 1 , wherein an axial collar secures the sealing device in a seat formed in a head portion of the piston member.

8. A valve assembly as recited in claim 1 , wherein the seal member is mounted to the piston member, and wherein a threaded retainer secures the sealing device in a seat formed in a head portion of the piston member.

9. A valve assembly as recited in claim 1 , wherein the seal member is formed from PTFE.

10. A valve assembly as recited in claim 1 , wherein the spring member is a helically wound metallic spring.

11. A valve assembly for a fuel injector comprising:
a) a sleeve member having an interior chamber;
b) a piston member supported for movement within the interior chamber of the sleeve member and separating an upstream pressure side of the valve assembly from a downstream pressure side of the valve assembly;
c) a dynamic sealing device secured to the piston member for sealingly isolating the upstream pressure side of the valve assembly from the downstream pressure side of the valve assembly, the dynamic sealing assembly including:
i) an annular seal member formed from PTFE and having a generally C-shaped cross-section and including opposed upstream and downstream legs defining an internal cavity with an opening facing toward the upstream pressure side of the valve assembly, wherein the upstream leg has a radial length that is greater than a radial length of the downstream leg and includes a retaining foot that extends angularly away from the upstream leg in an upstream direction; and
ii) a metallic helical spring disposed within the internal cavity of the seal member for providing a constant sealing force to the seal member, wherein a threaded retainer secures the sealing device in a seat formed in a head portion of the piston member.

12. A valve assembly as recited in claim 11 , wherein the retaining foot extends away from the upstream leg of the seal member at an angle of between about 0° and 90°.

13. A valve assembly as recited in claim 11 , wherein the sleeve member and piston member are adapted and configured to operate as a check valve.

14. A valve assembly as recited in claim 11 , wherein the sleeve member and piston member are adapted and configured to operate as a schedule valve.

15. A valve assembly as recited in claim 11 , wherein the sleeve member and piston member are adapted and configured to operate as a combined check valve and schedule valve.

16. A valve assembly as recited in claim 11 , wherein an axial collar secures the sealing device in a seat formed in a head portion of the piston member.

Assignees

• Delavan Inc

Inventors

• Thomson Neal A
• Tibbs Andy W

Classifications

• F16J15/3212

  with metal springs · CPC title

• F05D2240/55

  Seals · CPC title

• Y10T137/7925

  Piston-type valves · CPC title

• Y10T137/7867

  Sequential · CPC title

• F16K1/34 Primary

  Cutting-off parts, e.g. valve members, seats (F16K1/06, F16K1/12, F16K1/14, F16K1/26 take precedence) · CPC title