Hydraulic Valves/

Hydraulic Relief Valve

Hydraulic relief valves are used to limit the pressure in a hydraulic system. They achieve this result by allowing the pressurized hydraulic fluid to flow out of the system into an auxiliary passage.

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Fulflo Specialties, Inc.
Blanchester, OH
937-783-2411
Since 1912, Fulflo has been providing "chatter free" valves that modulate to control pressure: hydraulic bypass relief valves, oilfield valves, pilot valves, pressure regulator valves & hydraulic pressure control valves, which mount in any position. Our hydraulic by-pass relief valves measure from 1/4 - 4". A pioneer in fluid power, we constantly strive to be a worldwide valve producer leader.
 
The Lee Company
Westbrook, CT
860-399-6281
For over 60 years, The Lee Company has been manufacturing high quality miniature hydraulic valves for use in aerospace hydraulic systems, oil tools and other industries worldwide. Our selection of hydraulic valves includes check valves, pressure relief valves, thermal relief valves, shuttle valves, piloting solenoid valves & more.
 
Westfield Hydraulics Inc.
Pacoima, CA
818-896-6414
Westfield Hydraulics designs and manufactures special purpose components for the aerospace industry. We offer a fully integrated custom manufacturing system. This integration permits us to provide the highest quality product. We manufacture hydraulic check and release valves, hydraulic solenoid valves, hydraulic valve actuators, thrust reverser valves and steering valves. Visit our website today!
 
Western FluiDyne
Fraser, MI
800-842-5377
Western FluiDyne manufactures hydraulic pumps, motors & valves. We carry a wide range of remanufactured pumps as well as our own FluiDyne and Veljan products. Single, double & triple pumps with many shaft options are available. We promise to serve and respect the rebuilders & resellers of North America and the global market with high quality new and remanufactured pumps, motors, valves & filters.
 
DC Hydraulics, Inc.
Canton, MI
734-416-8999
As fluid power specialists, DC Hydraulics distributes hydraulic power systems. We offer name brand hydraulic systems along with design & instrumentation. Let us help you with your next fluid power purchase. For over a decade, our fast service & response to your requests are completed within 24 hours. We pride ourselves on complete customer satisfaction in system design, build and component supply.
 
Northman Fluid Power
Carol Stream, IL
630-588-8488
Northman Fluid Power manufactures hydraulic and pressure control motors, valves, switches and pumps. Northman utilizes state of the art technologies, environmentally acceptable alternatives and strict quality processes to meet or exceed our customer's expectations of increased productivity and lowered operating costs while respecting the environment. We are a ISO 9001 certified company.
 
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Hydraulic Relief Valve

Hydraulic relief valves protect hydraulic systems from being exposed to high pressures that exceed the mechanism's specified limits. A relief valve is placed at the entrance to a separate tube and is set to only open when a certain amount of pressure is applied, which can only be applied if there is too much liquid or gas in the chamber or pipe. An auxiliary passage, which is where the relief valve sends the extra liquid or gas to relive the pressure in a mechanism, is usually just an extra pipe that leads to a chamber where most likely the fluid is burned and the gas left over is released into the atmosphere. This is a particular necessity in the chemical and petrochemical manufacturing industry, as well as in petroleum refining plants, natural gas processing and power generation industries. If the pressure in a hydraulic pump exceeds its designed pressure limit, internal leakage or damage to the pump components can occur. Depending on what the liquid is, such leaks could also cause serious damage to individuals in the vicinity and the environment.

In hydraulic control systems, the relief valve acts as a check valve, with a ball and an adjustable spring. When a relief valve opens to divert fluid into an auxiliary passage, the pressure inside the hydraulic cylinder drops and allows the valve to close. A hydraulic system will often employ several types of valves, although the hydraulic relief valve is usually the first encountered in the circuit. Hydraulic relief valves can be found in almost any mechanism that runs on hydraulic power, such as automobile transmissions, brakes, power steering, aviation and in industrial and construction machinery. Relief valves are built from the same basic materials that most hydraulic valves are made from. The strong and corrosion resistant metals that are most common are stainless steel, aluminum, iron, brass and copper. Aluminum and stainless steel are thin, light weight and flexible, while still retaining the strength necessary to control the flow of liquid. Usually when a heavy metal like iron is used for the body of a valve, one of those two lighter metals is still used for the disc or plunger. Plastic is also used, particularly thermoplastics that are developed specifically to be used as valve material. Although they are not as resistant to corrosion as metal, they are cheaper. It's all about options.
Relief valve
Relief Valves Image Provided by Fulflo Specialties, Inc.