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Pressure Relief Valves

Our whole range of pressure and vacuum relief valve are designed to prevent excessive pressure or vacuum buildup in sealed containers or equipment.


Two-Way Valves

Two Way Relief Valves are designed for transit and storage containers but can also be used for electronic and electro-optics equipments. The valves have separate and distinct settings for both pressure and vacuum relief. Standard settings range from 0.5psid to 3.0psid reseal pressure. These valves are tamper-proof and require no field maintenance. On some of these valves a desiccant cartridge can be fitted to adsorb moist air entering an equipment or container. Most valves have a manual release push button to equalise pressure or vacuum differentials in order to open the container or equipment.

M30 Thread Pressure Relief Valve (Polycarbonate)

Unthreaded FDA Approved Two Way Relief Valve

M25 Thread Stainless Steel Relief Valve Panel Mounting Double Differential Relief Valve.

¾" Thread Double Differential Relief Valve

1.00-20 UNEF Thread Double Differential Relief Valve.

2.00-18 UNS Thread Double Differential Relief Valve

¾" UN Thread 15/30%RH Indicator Plug RF Screened With Square Drive

Two-Way Valves

Two Way Relief Valves are designed for transit and storage containers but can also be used for electronic and electro-optics equipments. The valves have separate and distinct settings for both pressure and vacuum relief. Standard settings range from 0.5psid to 3.0psid reseal pressure. These valves are tamper-proof and require no field maintenance. On some of these valves a desiccant cartridge can be fitted to adsorb moist air entering an equipment or container. Most valves have a manual release push button to equalise pressure or vacuum differentials in order to open the container or equipment.

M30 Thread Pressure Relief Valve (Polycarbonate)

Unthreaded FDA Approved Two Way Relief Valve

M25 Thread Stainless Steel Relief Valve Panel Mounting Double Differential Relief Valve.

¾" Thread Double Differential Relief Valve

1.00-20 UNEF Thread Double Differential Relief Valve.

2.00-18 UNS Thread Double Differential Relief Valve

¾" UN Thread 15/30%RH Indicator Plug RF Screened With Square Drive

Outward Valves

Outward Relief Valves are designed for use in electronic and electro-optics equipments. The valves have pressure relief only. Standard settings range from 0.5psid to 5.0psid pressure. These valves are tamper-proof and require no field maintenance. A typical application for pressure relief valve is a safety valve for pneumatic pipelines as used with BLD8042/01. Note: all of our two way relief valves can also be set for inward or outward only pressure settings.

M20 Thread Outward Relief Valve

Flange Mounted Outward Relief Valve

M30 Thread Outward Relief Valve

1.5 BSP Thread Outward Relief Valve (Stainless Steel)

2" Thread Outward Relief Valve (Stainless Steel)

1.5 BSP Double Thread Outward Relief Valve

M20 Thread Outward Relief Valve

High Flow Relief Valves

Our High Flow Valve is intended for applications requiring the moving of large amounts of air in short periods of time, automatically. This offers both pressure and vacuum relief for rapid decompression or explosive decompression. The manual release button ensures easy entry into the enclosure when it is under vacuum conditions and safe opening when the container is pressurised. The attached retaining clip guarantees the button is only used when intended. The lanyard makes losing the retaining clip impossible.

4" UNF Thread Pressure Relief Valve

Ultra High Flow Valves

The Deluge pressure relief valve is a new design Brownell Ltd has developed, for over pressure and vacuum relief applications. The range has standard sizes of 25-200mm. These valves have an unusual operating characteristic. After fully opening there is a proportional decrease in back pressure. This allows significantly higher increases in gas flow when compared to similar size relief valves. These valves have reaction speeds of less than 0.2 seconds this product is suitable for various applications, such as over pressure in pipelines, pressure vessels, storage vessels, equipment containers and safety relief applications. The deluge relief valves are fully automatic and reset after opening, even when maximum flow performance has been achieved. The standard range of pressure settings is from 0.5 to 5 psi for pressure and vacuum relief. These products can operate in aggressive environments, including corrosive chemicals, driving rain, and low & high temperatures. A weather and impact shield provides further mechanical and physical protection. Additional product options also include debris filter, EMC screening and a manual relief override.

Combined Relief Valves & Indicators

Combining a Humidity Indicator and Relief Valve have the advantage of only requiring one hole to be fitted to equipment or containers where space is limited. They are designed for mounting in moisture sensitive electronic or electro-optic equipment, or any other humidity controlled enclosure that will be subjected to air transportation. They readily detect changes in the humidity of the space being monitored by using a colour change indicator paper which turns from blue to pink as the humidity increases, and turns back to blue when the humidity decreases. Most of the units can be fitted with a desiccant cartridge which will adsorb any moisture entering the equipment during its use. These additional units are known as static desiccators.

M24 Thread Pressure Relief & Humidity Indicator Unit

¾" Thread Humi-Valve

Inward Valves

Inward Relief Valves are designed for use in electronic and electro-optics equipments. The valves have vacuum relief only. Standard settings range from 0.5psid to 5.0psid pressure. These valves are tamper-proof and require no field maintenance. On some of these valves a desiccant cartridge can be fitted to adsorb moist air entering an equipment or container. A typical application for these valves is gas scavenging as with BLD6017/01, they can also be used as check valves for pipelines. Note: all of our two way relief valves can also be set for inward or outward only pressure settings.

M24 Thread Inward Relief Valve

1.5" BSP Thread Inward Relief Valve

½" BSP Thread Inward Relief Valve

1" BSP Thread Inward Relief Valve

M24 Thread Inward Relief Valve

Manual Relief Valves

Manual Relief valves are designed for use in small containers or cases, where automatic valves are not required. They provide various methods of manually equalising pressure or vacuum differentials before opening the containers. Each type is easily installed through a single hole in the wall of the case and comes complete with all attaching hardware. Some have safety wire protection features to prevent unauthorised opening of the valves. Recommended torque value for installation of all manual relief valves is 30 lbs/ins. Note: Because it is visually impossible to tell whether the manual valves are open o closed, careful consideration should be taken of the potential consequences (continuous exposure to outside atmosphere if left open; potential damage to container if left closed) before selecting these valves.

Manual Relief Valve (Exhaust Port)

0.466-32 UNS Thread Breather Valve

0.200-20 UNF Thread Breather Valve

0.200-20 UNF Thread Breather Valve

Purge Valves

UNF Purging Valve provides a tire valve core in lightweight minimum length housing. The valve may be used to purge or pressurise containers. An air chuck is required to actuate the valve (not furnished by Stream Peak). The cap may be secured to the housing by a user supplied safety wire.

Self Sealing Valve (Connection Port)

0.375-24 UNF Purging Valve

Foog Vent

The FOOG Vent is a Filtered Outlet Out Gassing vent which is FDA approved and suitable for various bag or container requirements

Low Pressure Relief Valve (FOOG Vent)

Exhaust & Connection Ports

These are more specialised products used for large container applications where air drying equipment needs to connected to items such as satellite containers.

Self Sealing Valve (Connection Port)

Manual Relief Valve (Exhaust Port)

Non-Return Valves

Non-Return Valves are designed to allow air flow in one direction and then shut off when an air flow comes from the opposite direction.

M16 Thread Non-Return Valve