GB2101276A

GB2101276A - Pressure relief valve

Info

Publication number: GB2101276A
Application number: GB08213505A
Authority: GB
Inventors: Harry Hanney
Original assignee: GRUNDY
Current assignee: GRUNDY
Priority date: 1981-05-11
Filing date: 1982-05-10
Publication date: 1983-01-12

Abstract

A pressure relief valve has housing with a support 2 defining seat 4 around vent aperture 3. A rubber valve member 5 is located in a metal cap 6 and urged by leaf spring 7 into sealing contact with seat 4 to dose the aperture 3. The spring is held by an annular recess 11 defined between clamp ring 8 and support 2. The spring is of circular planform with cut-away opposed sides. <IMAGE>

Description

SPECIFICATION A pressure relief valve This invention relates to a pressure relief valve primarily intended for use in confined spaces where it is not possible to install conventional spring pressure or plunger mechanisms.

It is an object of this invention to provide an over pressure relief device occupying little space and of a flat shape and in which few moving parts are required.

According to this invention there is provided a pressure relief valve comprising a housing with a support member having a passageway with a seating there around for a resilient valve member having a face sealingly engageable with the seating to close the passageway aperture, a leaf spring laying over the valve member and having opposed spaced sides each secured between respective portions of the support member and a clamp means, the spring acting to urge the valve member against the support member.

Preferably the valve member is of rubber and may be contained within a metal cup lying over that surface of the valve adjacent the spring.

When gas, or fluid pressure within the housing is above a predetermined value the valve member is lifted against the force of the spring and gas may exhaust from the passageway aperture past the valve and around the edges of the spring to pass through vents provided in the top of the housing. As the pressure reduces the valve member is urged back by the spring to close the aperture.

With such an arrangement the device has a minimum of moving parts and can be readily incorporated within a tube or other small diameter article with the device occupying the minimum of depth.

Further features of the invention are described in conjunction with the accompanying drawings showing one embodiment.

In the drawings: Figure 1 shows a longitudinal section through a valve, and Figure 3 shows a plan view of the spring.

Referring to the drawings the valve comprises a cylindrical housing 1 containing a support member 2 through which a centrally disposed passageway 3 is provided. The support member has a recess 4 forming a seating for a rubber valve member 5 of which the upper portion is enclosed within a metal cup 6. A leaf spring 7 lies over the cup 6 and has the opposed sides 7a secured between the support member 2 and a clamp ring 8.

When excess pressure occurs within the housing 1 the valve 5 is lifted against the spring 7 and gas passes through aperture 3 around the valve member and edges of the spring to exhaust through vents 9 in the top of the housing.

The ring 8 has an inwardly stepped shoulder 10 to restrain the valve and spring against excess movement away from the support 2. The spring is secured against longitudinal displacement by an annular recess 11 formed between ring 8 and support 2, the recess allowing lateral movement on flexure of the spring.

A further advantage of the construction disclosed resides in the retention of the parts within the housing should any catastrophic failure occur in the valve member or spring. The support 2, ring 8 and housing 1 may be screw connected, press fitted, brazed or joined by a variety of known expedients and as can be seen from the drawing the method used is not required in itself to withstand pressures occurring in view of the operative engagement with the housing in the direction of pressure action.

1. A pressure relief valve comprising a housing with a support member having a passageway with a seating there around for a resilient valve member having a face sealingly engageable with the seating to close the passageway aperture, a leaf spring lying over the valve member and having opposed spaced sides each secured between respective portions of the support member and a clamp means, the spring acting to urge the valve member against the support member 2. A pressure relief valve according to Claim 1, wherein the valve member is of rubber contained in a metal cup lying over that surface of the valve adjacent the spring.

3. A pressure relief valve according to Claims 1 or 2, wherein the seating is formed within a countersunk bore around the aperture.

4. A pressure relief valve according to any preceding claim, wherein the clamp means comprises a ring peripheraliy embracing the support member and extending over the edge thereof to define a recess receiving the opposed sides of the spring.

5. A pressure relief valve according to any preceding claim, wherein the clamp means includes a shoulder extending inwardly over and above the spring and providing an abutment against excess displacement away from the support member.

6. A pressure relief valve according to any preceding claim, wherein the housing has an upper surface extending over the valve member, said surface having one or more apertures therein forming vents.

7. A pressure relief valve according to any preceding claim, wherein the spring is held by opposed spaced sides in a limited laterally displaceable manner.

8. A pressure relief valve as claimed in any preceding claim, wherein the spring is of circular planform with opposed cut-away portions to allow venting from the aperture.

9. A pressure relief valve as described herein and as shown in the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **.

SPECIFICATION A pressure relief valve This invention relates to a pressure relief valve primarily intended for use in confined spaces where it is not possible to install conventional spring pressure or plunger mechanisms.

It is an object of this invention to provide an over pressure relief device occupying little space and of a flat shape and in which few moving parts are required.

According to this invention there is provided a pressure relief valve comprising a housing with a support member having a passageway with a seating there around for a resilient valve member having a face sealingly engageable with the seating to close the passageway aperture, a leaf spring laying over the valve member and having opposed spaced sides each secured between respective portions of the support member and a clamp means, the spring acting to urge the valve member against the support member.

Preferably the valve member is of rubber and may be contained within a metal cup lying over that surface of the valve adjacent the spring.

When gas, or fluid pressure within the housing is above a predetermined value the valve member is lifted against the force of the spring and gas may exhaust from the passageway aperture past the valve and around the edges of the spring to pass through vents provided in the top of the housing. As the pressure reduces the valve member is urged back by the spring to close the aperture.

With such an arrangement the device has a minimum of moving parts and can be readily incorporated within a tube or other small diameter article with the device occupying the minimum of depth.

Further features of the invention are described in conjunction with the accompanying drawings showing one embodiment.

In the drawings: Figure 1 shows a longitudinal section through a valve, and Figure 3 shows a plan view of the spring.

Referring to the drawings the valve comprises a cylindrical housing 1 containing a support member
2 through which a centrally disposed passageway

3 is provided. The support member has a recess 4 forming a seating for a rubber valve member 5 of which the upper portion is enclosed within a metal cup 6. A leaf spring 7 lies over the cup 6 and has the opposed sides 7a secured between the support member 2 and a clamp ring 8.

When excess pressure occurs within the housing 1 the valve 5 is lifted against the spring 7 and gas passes through aperture 3 around the valve member and edges of the spring to exhaust through vents 9 in the top of the housing.

The ring 8 has an inwardly stepped shoulder 10 to restrain the valve and spring against excess movement away from the support 2. The spring is secured against longitudinal displacement by an annular recess 11 formed between ring 8 and support 2, the recess allowing lateral movement on flexure of the spring.

A further advantage of the construction disclosed resides in the retention of the parts within the housing should any catastrophic failure occur in the valve member or spring. The support 2, ring 8 and housing 1 may be screw connected, press fitted, brazed or joined by a variety of known expedients and as can be seen from the drawing the method used is not required in itself to withstand pressures occurring in view of the operative engagement with the housing in the direction of pressure action.

1. A pressure relief valve comprising a housing with a support member having a passageway with a seating there around for a resilient valve member having a face sealingly engageable with the seating to close the passageway aperture, a leaf spring lying over the valve member and having opposed spaced sides each secured between respective portions of the support member and a clamp means, the spring acting to urge the valve member against the support member 2. A pressure relief valve according to Claim 1, wherein the valve member is of rubber contained in a metal cup lying over that surface of the valve adjacent the spring.
3. A pressure relief valve according to Claims 1 or 2, wherein the seating is formed within a countersunk bore around the aperture.
4. A pressure relief valve according to any preceding claim, wherein the clamp means comprises a ring peripheraliy embracing the support member and extending over the edge thereof to define a recess receiving the opposed sides of the spring.
5. A pressure relief valve according to any preceding claim, wherein the clamp means includes a shoulder extending inwardly over and above the spring and providing an abutment against excess displacement away from the support member.
6. A pressure relief valve according to any preceding claim, wherein the housing has an upper surface extending over the valve member, said surface having one or more apertures therein forming vents.
7. A pressure relief valve according to any preceding claim, wherein the spring is held by opposed spaced sides in a limited laterally displaceable manner.
8. A pressure relief valve as claimed in any preceding claim, wherein the spring is of circular planform with opposed cut-away portions to allow venting from the aperture.
9. A pressure relief valve as described herein and as shown in the accompanying drawings.