Pressure Relief Valves

Pressure relief valves protect vessels or containers during an overpressure event. Overpressure occurs when the pressure inside an enclosed container or equipment exceeds the specific or maximum working pressure level.

Efficient Fluid System Control

Installing these safety valves releases gas from the over-pressurised enclosure and protects assets. Our pressure-release solutions include military-grade, self-actuating valves that efficiently control fluid system variables like pressure, flow, and temperature.

These valves operate autonomously, requiring no electric power or compressed air. Their robust construction ensures durability and reliability in various environments.  The valves activate when pressure reaches hazardous levels, safeguarding equipment and preventing damage. Customisable options are available for specific application needs, and seamless integration facilitates easy installation.

  • Overpressure protection for vessels & containers
  • Releases gas from over-pressurized enclosures
  • Controls fluid system variables (pressure, flow, temperature)
  • No need for electric power or compressed air
  • Activates at hazardous pressure levels
  • Ensures asset and life protection
  • Military-grade durability
  • Easy installation on most equipment
  • Effective damage prevention
  • Self-activating safety valves
Ultra High Flow Valve

Ultra-high flow valves are designed for overpressure and vacuum relief applications. They are available in three standard sizes of 1”, 3”, and 8” (25mm, 76mm, and 200mm) and range from 0.5 to 5.0 psi, and can operate in adverse environments such as driving rain, corrosive chemicals, and low and high temperatures.

Two-Way Relief Valve

Two-way relief valves can be used for transit and storage containers and electronic and electro-optics equipment. The tamper-proof valves have standard settings ranging from 0.5 psid to 3.0 psid to reseal the pressure. They have a manual release push-button for equalising the pressure or vacuum differentials to open the container or equipment.

Purge Relief Valve

The purge relief valve provides a tire valve core in minimum-length housing to purge or use in pressurised containers. An air chuck is required to activate the valve. Users can attach the safety wire to the body to secure the cap.

Outward Relief Valve

Outward relief valves relieve pressure in electro and electric-optic equipment and standard settings from 0.5 psid to 5.0 psid. They are available in different models such as thread outward relief valve, flange mounted outward relief valve, push-fit outward relief valve, un-threaded glass loaded nylon with splash guard outward relief valve, 10mm diameter push-fit outward relief valve, and 1.5 BSP double thread outward relief valve, etc.

Non-Return Valve

A non-return valve is designed to allow airflow in one single direction and prevent it from coming in the opposite direction. It comes in in-line non-return valve and M16 thread non-return valve models.

Manual Relief Valve

Manual relief valves offer various methods to equalise vacuum differentials or pressure before opening the containers. They are equipped with attaching hardware and can be easily installed on the wall of the case. Some models even come with a safety wire protection feature to prevent the containers from unauthorised openings of the valves. The torque value for the installation is 30 lbs/ins.

Inward Relief Valve

The inward relief valve has a vacuum relief with settings ranging from 0.5 psid to 5.0 psid pressure. As it is tamper-proof, this valve does not require any field maintenance. It comes in eight models, ideal for electronic and electro-optics equipment applications. Some of these let a desiccant cartridge be fitted for adsorbing the moist air in the container or equipment.

High Flow Relief Valve

A high-flow relief valve helps to move high quantities of air automatically and quickly to prevent pressure buildup in applications. It provides pressure and vacuum relief at an opening point of 0.50 psi ± 0.25 psi for fast or explosive decompression. It is best to protect from atmospheric pressure and allow safe application access.


FOOG vent is ideal for preventing the overpressure in the packaging caused by the gassing of a product during and after the process. Users can use the vent to equalise the atmospheric variations. It has a sintered plastic filter to withstand side loads and shocks during filling and transit. It can be mounted into gas tap flanges or bulkhead mounted with an adaptor flange to protect storage bags containing food aggregates and milk powder.

Exhaust & Connection Port

Large containers need equipment for air drying to ensure a contaminant and moisture-free environment. Exhaust and Connection Ports are essential for efficient and seamless operations. Om Mas offers a self-sealing valve (Connection Port) and a manual relief valve (Exhaust Port). Both ports work together to ensure air circulation inside the container, preventing flowing out.

Relief Valves with Humidity Indicator

Relief valves with humidity indicators are ideal for optical-electronic equipment, moisture-sensitive electronics, or any other device or equipment requiring humidity control in enclosed spaces subject to air transportation. Relief valves with humidity indicators need a single hole for fitting in containers or equipment, and the sensor paper changes colour from blue to pink with an increase in humidity. It is also possible to insert a desiccant cartridge as an additional unit, called a static desiccator, to absorb any additional humidity or moisture from within the equipment.