Pressure Relief Valves

Pressure relief valves perform the vital role of limiting the air or fluid pressure or vacuum in a system. Designed to open at a predetermined pressure, relief valves protect your system from over or under pressurization.

When the safe pressure of a system is exceeded, the relief valve opens and air or fluid is diverted through this auxiliary route – thus protecting your system from pressure that has exceeded the safe pressure range.

Once the pressure reaches safe levels the relief valve will close allowing normal operation of the system to continue, with the relief valve ready to operate again.

Pressure relief valves are also known as vacuum relief valves, blow-off valves, pop-off valves, pressure regulating valves, safety valves, and purge valves.

All Smart Products check valves are ideal for use as pressure relief valves and offer the following advantages:

With our custom design and assembly capabilities, special testing, and over 3 million possible combinations from which to choose, we're sure to have just the right configuration to meet your needs. Our wide range of plastic, o-ring, and spring materials allow you to design your own “custom pressure relief valve”…without a custom price.

Need a sample or have a question? Call (800) 338-0404 or simply fill out our contact form with your technical requirements.

	Series 100 - Cartridge Check / Relief Valve Standard, Barbed, NPT, Side Seal, and Manual Relief Bleed Valve styles 1/8" to 3/4" Sizes Easily inserted into fitting, manifold, or installed in-line 3" H2O to 20 PSI opening pressures
	Series 200 - NPT Check / Relief Valve Male and female NPT styles 1/8" and 1/4" NPT sizes Compression tubing adapter available 3" H2O to 20 PSI opening pressures
	Series 300 - Modular Check / Relief Valve Barb, NPT, and Foot/Filtering styles Our most popular model provides maximum versatility with the widest range of options Flexible modular design 3" H2O to 17 PSI opening pressures
	Series 500 - Miniature Check / Relief Valve Male and female Luer styles 1/16" and 1/8" Luer sizes Flexible modular design 3" H2O to 20 PSI opening pressures
	Manual Relief Control Valve Used for low pressure air applications Unique design provides pressure or vacuum relief at the touch of a button Threaded for panel mounting; 5/8-18 thread pitch May be used in combination with any 300 series end fitting
	Manual Relief Bleed Valve Control Valve Used for liquid or air Strategically placed bleed holes allow pump priming or any Manual Relief Bleed Valve application Custom-sized holes available for minimal design charge.