Non chattering pressure relief valve

Patent metadata

Field	Value
Publication number	US-9303776-B2
Application number	US-201313951536-A
Country	US
Kind code	B2
Filing date	Jul 26, 2013
Priority date	Jul 26, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A pressure relief valve includes a valve body having an inlet and an outlet and defining a first fluid path fluidly connecting the inlet and the outlet of the valve; a valve member axially moveable between a first position and a second position, the valve member configured to close the fluid path in the first position and thereby restrict flow between the inlet and the outlet, the valve member configured to open the fluid path in the second position and thereby allow flow between the inlet and the outlet; a biasing element configured to bias the valve member in the first position; and a friction element resiliently biased laterally against an axially extending surface of the valve member to provide frictional resistance to movement of the valve member and thereby cause hysteresis in axial movement of the valve member between the first position and the second position.

First claim

What is claimed is:

1. A pressure relief valve comprising:
a valve body having an inlet and an outlet and defining a first fluid path fluidly connecting the inlet and the outlet of the valve;
a valve member axially moveable between a first position and a second position, the valve member configured to close the fluid path in the first position and thereby restrict flow between the inlet and the outlet, the valve member configured to open the fluid path in the second position and thereby allow flow between the inlet and the outlet;
a biasing element configured to bias the valve member in the first position; and
a friction element resiliently biased laterally against an axially extending surface of the valve member to provide frictional resistance to movement of the valve member and thereby cause hysteresis in axial movement of the valve member between the first position and the second position,
wherein the friction element is a friction ring surrounded by a canted spring.

2. The pressure relief valve of claim 1 , wherein the friction ring is a segmented friction ring.

3. The pressure relief valve of claim 2 , wherein the segmented friction ring includes three segments.

4. The pressure relief valve of claim 2 , wherein the segmented friction ring includes two segments.

5. The pressure relief valve of claim 1 , wherein the friction ring includes a scarf cut.

6. The pressure relief valve of claim 1 , wherein the valve member is a poppet that seals against a valve seat.

7. The pressure relief valve of claim 6 , further comprising an annular spacer in line with the fluid path and configured to remain fixed relative to the body; and
a poppet chamber in the spacer.

8. The pressure relief valve of claim 7 , wherein a venting hole in the spacer fluidly connects the poppet chamber to the fluid path.

9. A pressure relief valve, comprising:
a housing surrounding a first fluid path that fluidly connects an upstream flow passage and a downstream flow passage of the housing, the upstream flow passage being axially aligned with the downstream flow passage;
an annular spacer in line with the first fluid path and configured to remain fixed relative to the housing;
a poppet chamber in the spacer;
a poppet configured to slide axially within the poppet chamber and having a head to seal against a valve seat in the housing, wherein in a first closed position, the poppet prevents fluid flow through the first fluid path, and in a second, open position, the poppet allows fluid flow through the first fluid path;
a friction element configured to press laterally against an axially extending surface of the poppet and cause hysteresis in axial movement of the poppet between the first position and the second position; and
a biasing element configured to bias the poppet outwardly from the chamber of the spacer into the first closed position,
wherein a portion of the first fluid path is between the housing and the spacer, and
wherein the friction element is a friction ring surrounded b a canted spring.

10. The pressure relief valve of claim 9 , wherein the friction ring includes a scarf cut.

11. The pressure relief valve of claim 9 , wherein a venting hole in the spacer fluidly connects the poppet chamber to the first fluid path.

Assignees

• Parker Hannifin Corp
• Parker Hannifin Corp

Inventors

• Zhang Geoffrey R
• Craven Rodney K

Classifications

• F16K15/02 Primary

  with guided rigid valve members · CPC title

• F16K15/021 Primary

  the valve member being a movable body around which the medium flows when the valve is open (F16K15/025 - F16K15/12 take precedence) · CPC title

• Y10T137/7904

  Reciprocating valves · CPC title