Air compressors play a vital role across Malaysia’s industrial sectors—from automotive workshops and packaging lines to food manufacturing and oil refineries. While compressors help deliver essential pressurised air to power equipment and automation systems, they also come with inherent risks. Without proper safeguards, a sudden pressure build-up could lead to catastrophic failure.
This is where the pressure relief valve becomes crucial. Often called a “safety valve,” it is the final line of defence against over-pressurisation. It’s a small component, but it carries big responsibility—protecting both equipment and human life.
In this article, we’ll explore the design, function, and maintenance of pressure relief valves for air compressors, specifically in the Malaysian context. You’ll discover how choosing the right valve and maintaining it properly can reduce downtime, improve workplace safety, and ensure compliance with safety regulations.
A pressure relief valve is designed to open automatically when the pressure in a compressed air system exceeds a predetermined level. Once activated, the valve allows air to escape until the internal pressure returns to safe levels, at which point the valve closes again.
This automatic mechanism prevents ruptures, hose bursts, or compressor tank explosions—common risks when pressure builds beyond rated limits. In Malaysia, where ambient temperatures and humidity can increase operating pressure, this safety device becomes even more essential.
Most pressure relief valves used in compressors are spring-loaded pop-type designs. The spring tension determines the opening pressure, which must be precisely calibrated to the system’s maximum allowable working pressure (MAWP).
These valves are generally rated in bar or psi and come with adjustable settings. In many cases, especially for industrial units, the pressure relief valve must be tagged, certified, and tested to meet DOSH or international standards.
Choosing an under- or over-rated valve can lead to false releases or dangerous malfunctions, especially during high-duty cycles.
Whether you’re operating a small portable compressor in an automotive workshop or a large fixed installation in a factory, a pressure relief valve is mandatory. In fact, most Malaysian workplaces are required to have them under Occupational Safety and Health Act (OSHA) guidelines.
It’s not just about compliance—it’s about preventing injury. When installed properly, these valves offer silent, consistent protection that operators can rely on, even when they’re not actively monitoring gauges.
Every pressure relief valve should be rated according to the maximum pressure your air compressor can generate. For example, if your system runs at 8 bar and has a cut-off at 9 bar, your valve should release at 10 — 10.5 bar for safe margin.
Using an underrated valve may result in unnecessary air discharge, while an overrated valve may not open in time—defeating its purpose.
Natrade offers guidance in selecting ASME- and CE-certified valves suited to Malaysian industrial conditions.
Valves are typically available in BSP, NPT, or metric threads, and must match your compressor tank or manifold outlet. Improper fittings may cause air leakage or vibration-related damage.
Valve sizing also affects performance. A larger valve will exhaust air more rapidly, while smaller valves may restrict flow. Refer to compressor CFM ratings to match valve discharge capacity accordingly.
For high-output compressors used in spray painting, packaging, or CNC operations, fast-release valves are often preferred to reduce pressure spikes.
Valves may be constructed of brass, stainless steel, or aluminium, with internal seals made of PTFE, Viton, or EPDM. For Malaysian environments exposed to high humidity, dust, or corrosive vapours, corrosion-resistant materials are a must.
In industries like marine engineering or food processing, the pressure relief valve must also be hygienic, rustproof, and capable of withstanding cleaning chemicals or salty air.
Natrade supplies valves suitable for these conditions, along with optional dust caps and noise suppressors for indoor use.
A neglected pressure relief valve can fail when needed most. Valve malfunction is often caused by:
Routine checks—ideally every 3 to 6 months—can help prevent failure. Technicians should:
For certified installations, hydrostatic or pneumatic testing may be required annually, particularly in industries regulated by DOSH or ISO 45001.
Natrade offers testing and recalibration services to help clients comply with safety audits and ensure peace of mind.
The pressure relief valve may be a small component, but it performs one of the most critical safety roles in an air compressor system. For industries in Malaysia—where air compressors power everything from automation to pneumatics—having the correct valve, properly installed and maintained, is non-negotiable.
Natrade provides a full selection of pressure relief valves for various compressor capacities, industries, and environmental conditions. We also offer support for testing, maintenance scheduling, and product selection based on your equipment’s specifications.
To request a product catalogue, speak with a technical advisor, or ensure your system complies with Malaysian safety regulations, we invite you to register with us through our official platform.
North American Trade Source (NATS) is a trusted distributor of premium oil and gas equipment, committed to delivering innovative solutions and exceptional customer service worldwide.
