Hydraulic Valves/

Hydraulic Check Valves

Hydraulic check valves are automatic mechanical devices that allow hydraulic fluid to flow in one direction and prevent flow reversal. They have two openings: an inlet in which the fluid enters and an outlet through which the fluid exits. Because check valves operate automatically, they do not have manual switches or handles that activate the device.

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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 Check Valves

The mechanics of the valve are as follows: the cylindrical valve is attached to the head of the pump on the inlet and outlet lines of a liquid system, be it a small system like that of a car engine or a large system like that of a water treatment plant. A seat inside the cylinder is where the plugging device sits, although there is enough room that the liquid flow from one direction is able to move past it easily. It is when the pressure moves backwards that the plug will seal itself against the check valve walls, which will stop the reverse flow and prevent contamination of the liquid source. Hydraulic check valves are available in several plug designs: swinging disc, ball, plunger and poppet. The swinging disc is attached to a hinge and will open when enough pressurized flow from a single direction is applied. However, if that flow reverses, the swing disc will close and seal. The ball check valve uses a spherical plug that varies in material based on the liquid flow it is controlling. Hydraulic check valves may be made from sturdy, corrosion resistant metals like stainless steel or aluminum, as well as varieties of plastics.

Hydraulic check valves work in conjunction with hydraulic cylinders, pumps and motors. Hydraulic check valves are used in applications that require hydraulic pumps, such as automotive braking systems and construction tools and vehicles. The size and shape of a check valve can vary greatly, depending on its application. This is a very important piece of machinery, because without the ability to control the pressure of fluids as well as the flow of those fluids within a hydraulic process, the system could become unsafe and ineffective. Hydraulic check valves are often working in a system of hydraulic valves with other major styles of valves involved as well. There are also other styles that are very similar to the check valves. For example, hydraulic solenoid valves also work to control uni-directional flow of liquids with a plunger, except they are controlled electrically. Hydraulic proportional valves are specialized to control exactly how much liquid is released through the system. It is also a subcategory of hydraulic control valves.