The relief valve is a type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire.
http://en.wikipedia.org/wiki/Relief_valve

This device is your last line of defense in case of a thermostat failure resulting in overheating of your tank.
http://reliefvalve.net

Manufacturer of safety relief valves, air vents and steam traps.
http://www.aquatrol.com/

Safety Valves, Relief Valves, Safety Relief Valves, Steam Traps, Pressure Relief Valves
http://www.aquatrol.com/valveselection.html

RR Valve, Inc., is a high tech manufacturer of reset relief valves for the oil field industry. Based in Houston, Texas.
http://www.rrvalve.com/

Kunkle Valve is a leading manufacturer of quality safety and relief valve products for industrial and commercial applications, including steam, air, liquid (including cryogenics ...
http://www.kunklevalve.com/

Farris Relief Valves : Series 3800 Modulating Pilot Valve Reduce product loss and fugitive emissions with the PCM non-flowing ...
http://www.farrisengineering.com/Products/spokes/reliefValves.htm

Rockwood Swendeman manufactures valves, safety relif valves, pressure relief valves, and relief valves, for oxygen and nitrogen gases, cryogenic applications, pressure vessels ...
http://www.rockwoodswendeman.com/

Rockwood Swendeman manufactures Safety Relief and Three-way Diverter Valves for the industrial gas industry. Our facility is ASME and TUV accredited.
http://www.rockwoodswendeman.com/prodin.html

P.C. McKenzie Company represents pilot operated axelson relief valves, selling pilot operated relief valves, pressure relief valve,
http://www.mckenziecorp.com/axelson_relief_valves.htm

Consolidated Pressure Relief Valves . Dresser Consolidated is a worldwide leader and full service provider of dependable pressure relief valve solutions.
http://www.consolidatedvalve.com/

Tyco is the world's premier manufacturer of valves, valve actuators and actuator network controls, featuring over 90 well known brands of flow control products.
http://www.tycovalves-na.com/

noun . a device that, when actuated by static pressure above a predetermined level, opens in proportion to the excess above this level and reduces the pressure to it. Compare ...
http://dictionary.reference.com/search?q=relief%20valve

Flotech is a leader in sales and service of manual valves, safety relief valves and control valves for all major industries.? Call us today at
http://FLOTECHINC.COM

Learn more about Kennedy Valve's Relief Valves - Wall Type. ... Relief Valves - Wall Type General Information. Working Pressure: Valves unseat and swing open under unseating ...
http://www.kennedyvalve.com/wall-relief-valves.html

Learn more about Kennedy Valve's Relief Valves - Floor Type. ... Relief Valves - Floor Type General Information. Floor type hydrostatic pressure relief valve shall be designed for ...
http://www.kennedyvalve.com/floor-relief-valves.html

Relief valves from Circle Seal Controls, Inc., a manufacturer of valves, regulators and controls for hydraulic and pneumatic systems. Circle Seal offers the industry's widest ...
http://www.circle-seal.com/products/relief/index.html

Industrial Valve offers a complete line of safety and relief valves, actuators and valve related industrial products. Manufacturers include Crosby, Anderson Greenwood and Kunkle.
http://INDUSTRIAL-VALVE-TENNESSEE.COM

The Blythe Company is a manufacturer's representative for North Carolina, South Carolina, and East Tennessee.
http://www.theblythecompany.com/

Anderson Greenwood and Crosby are the world's premier manufacturers of pressure relief valves, tank blanketing products and instrumentation valves and manifolds.
http://www.andersongreenwood.com/