Poppet valve with integrated dampener

Patent metadata

Field	Value
Publication number	US-9903480-B2
Application number	US-201414223068-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	Jul 14, 2011
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A poppet valve with an integrated dampener is disclosed. In some embodiments, the valve includes a poppet guide with a stem and a hollow poppet is disclosed. The hollow poppet receives the poppet guide stem therein, thereby defining an internal cavity. The poppet is movable relative to the poppet guide to adjust the volume of the internal cavity. The poppet is also moveable relative to a valve seat between a seated position and an unseated position. The poppet may include a body with a seal groove and an elastic seal disposed within the seal groove. The seal is configured to engage the valve seat prior to the poppet body when the poppet moves toward the seated position. The valve may include a poppet guide pivot system that enables pivoting of the poppet guide and the poppet relative to an axial centerline of the valve.

First claim

What is claimed is:

1. A valve poppet for engagement with a valve seat to control a flow of a fluid, the valve poppet moveable relative to the valve seat between a seated position, wherein the valve poppet engages the valve seat, and an unseated position, wherein the valve poppet is disengaged from the valve seat, the valve poppet comprising:
a moveable poppet body having an axial centerline, a poppet stem having an inner bore to receive a guide stem wherein the poppet stem is moveable relative to the guide stem, and a poppet head extending from the poppet stem, the poppet head comprising:
a first segment disposed proximal the poppet stem and having an outer surface configured for exposure to the fluid;
a second segment disposed distal the poppet stem, axially spaced from the first segment, and having an outer surface configured for exposure to the fluid;
and an annular seal groove bounded by the first and second segments; and

an elastic seal disposed between the first and second segments and within the seal groove, the seal comprising a first annular protrusion that extends beyond the seal groove and an annular recess adjacent the first annular protrusion;
wherein the first segment of the poppet head extends radially farther than the second segment;
wherein the first annular protrusion is configured to contact the valve seat at a location between the poppet head and the valve seat when the valve poppet is in the seated position.

2. The valve poppet of claim 1 , wherein the seal further comprises a second annular protrusion; and
wherein the annular recess is disposed between the first and second annular protrusions.

3. The valve poppet of claim 2 wherein second annular protrusion extends beyond the seal groove.

4. The valve poppet of claim 1 , wherein the poppet head comprises an outer surface; and
wherein the seal groove is disposed radially below the outer surface; and
wherein the surface of the poppet body bounding the seal groove comprises a radially extending protrusion disposed within the seal groove and radially below the outer surface.

5. The valve poppet of claim 4 , wherein the seal groove comprises first and second portions defined by a radial plane that substantially bisects the protrusion of the seal groove, the first portion having a larger volume than the second portion, the first portion being distal the valve seat with the second portion disposed between the valve seat and the first portion.

6. The valve poppet of claim 1 , wherein the seal is attached to a first portion of the seal groove and is unattached to a second portion of the seal groove.

7. The valve poppet of claim 6 further comprising lubricant disposed between the seal and the second portion of the poppet body.

8. The valve poppet of claim 1 wherein the poppet head comprises a leading end and an outer surface portion extending between the leading end and the seal groove; and
wherein a first portion of the outer surface portion is curved, as viewed in profile; and
wherein the first annular protrusion of the seal is configured to contact the valve seat before the poppet body contacts the valve seat when the poppet body is transitioning from the unseated position to the seated position.

9. The valve poppet of claim 8 , wherein a second portion of the outer surface portion that is adjacent to the first portion is linear, as viewed in the profile.

10. A valve poppet for engagement with a valve seat, the valve poppet moveable relative to the valve seat between a seated position, wherein the valve poppet engages the valve seat, and an unseated position, wherein the valve poppet is disengaged from the valve seat, the valve poppet comprising:
a poppet body having an axial centerline, a poppet head, and a tubular poppet stem extending axially therefrom in a first direction, the poppet head comprising a generally conically-shaped outer surface facing away from the poppet stem, and comprising a circumferential seal groove extending radially inward from the outer surface;
wherein the poppet head further comprises a first segment disposed proximal the poppet stem and a second segment disposed distal the poppet stem and axially spaced from the first segment, wherein the first segment extends radially farther than the second segment and the groove is bounded by the first and second segments; and
an elastic seal disposed between the first and second segments and within the seal groove, the seal comprising a first annular protrusion that extends beyond the seal groove and an annular recess adjacent the first annular protrusion;
wherein the first annular protrusion is configured to contact the valve seat before the poppet body contacts the valve seat when the poppet body is transitioning from the unseated position to the seated position;
wherein an outer circumference of the first annular protrusion extends radially to a location that is radially inward of the annular recess.

11. The valve poppet of claim 10 , wherein the surface of the poppet body bounding the seal groove comprises a radially outwardly extending protrusion disposed within the seal groove and radially below the outer surface.

12. The valve poppet of claim 11 further comprising lubricant disposed between the radially extending protrusion and the seal.

13. The valve poppet of claim 10 , wherein the seal further comprises a second annular protrusion, and the annular recess is disposed between the first and second annular protrusions;
wherein the first annular protrusion is configured to contact the valve seat at a location between the poppet head and the valve seat when the valve poppet is in the seated position.

14. The valve poppet of claim 13 , wherein second annular protrusion extends beyond the seal groove.

15. A valve poppet for engagement with a valve seat, the valve poppet moveable relative to the valve seat between a seated position, wherein the valve poppet engages the valve seat, and an unseated position, wherein the valve poppet is disengaged from the valve seat, the valve poppet comprising:
a poppet body having a tubular poppet stem, a first segment disposed proximal the poppet stem, a second segment disposed distal the poppet stem and axially spaced from the first segment, an outer surface portion and a seal groove extending radially inward from the outer surface, wherein the seal groove is bounded by the first and second segments, and wherein the first segment extends radially farther than the second segment; and
an elastic seal disposed between the first and second segments and within the groove;
wherein the seal groove comprises a radially outwardly extending protrusion disposed within the seal groove and radially below the outer surface, and wherein a radial plane that substantially bisects the seal groove protrusion divides the seal groove into first and second portions.

16. The valve poppet of claim 15 , wherein the first portion of the seal groove has a larger volume than the second portion, the first portion being distal the valve seat with the second portion disposed between the valve seat and the first portion.

17. The valve poppet of claim 15 wherein the poppet body further comprises an axial centerline and a tubular stem extending axially therefrom in a first direction;
wherein the seal groove, as viewed in cross-section, further comprises a concave surface facing opposite the first direction.

18. The valve poppet of claim 15 wherein the elastic seal comprises a first annular protrusion that extends beyond the seal groove and an annular recess adjacent the first annular protrusio

Assignees

• Nat Oilwell Varco Lp

Inventors

• Marica Adrian

Classifications

• Y10T137/7915

  Guide stem · CPC title

• Y10T137/7904

  Reciprocating valves · CPC title

• F16K15/026

  the valve member being a movable body around which the medium flows when the valve is open · CPC title

• F04B53/129

  Poppet valves · CPC title

• F04B53/10

  Valves; Arrangement of valves · CPC title