What is a Hydraulic Check Valve?

Hydraulic systems have become increasingly popular in modern machinery and equipment, including tractors. These systems rely on a series of components, including pumps, cylinders, and valves, to generate and control fluid power. One essential component in any hydraulic system is a check valve, which plays a crucial role in ensuring reliable and safe operation.

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Check valve

A check valve, also known as a non-return valve, is a one-way valve that allows fluid to flow in only one direction. When the pressure of the fluid exceeds the spring force in the valve, the valve opens, allowing fluid to pass through. When the pressure drops below the spring force, the valve closes, preventing backflow of fluid. This function is critical in hydraulic systems, as it prevents fluid from flowing in the wrong direction, which can cause damage or lead to system failure.

There are different types of check valves, including ball valves, piston valves, and spring-loaded valves. Each type has its own advantages and disadvantages, depending on the specific application.

In hydraulic systems, check valves are commonly used to prevent pressure loss and maintain system efficiency. When a hydraulic cylinder extends, the fluid flows from the pump to the cylinder, and the pressure in the system increases. Without a check valve, the fluid could flow back to the pump, reducing the pressure and causing the cylinder to retract. This phenomenon, known as “cylinder creep,” can lead to poor system performance and reduced productivity. By installing a check valve in the system, the fluid can flow in only one direction, preventing cylinder creep and ensuring that the system operates as intended.

Another benefit of check valves in hydraulic systems is their ability to protect against pressure spikes and surges. When a valve or cylinder closes rapidly, it can create a sudden increase in pressure in the system. This pressure spike can damage the equipment or cause leaks in the system. These valves can help prevent pressure spikes by allowing fluid to flow freely when the pressure exceeds the set limit, thereby releasing the excess pressure and protecting the system from damage.

In tractors, hydraulic systems are essential for various functions, such as lifting and lowering implements, controlling steering, and powering attachments. A malfunction in the hydraulic system can result in reduced performance, increased fuel consumption, and costly repairs. By incorporating check valves in the system, tractor operators can ensure that the system operates reliably and safely, increasing productivity and reducing downtime.

In conclusion, check valves play a crucial role in hydraulic systems and tractors. They prevent backflow of fluid, prevent cylinder creep, protect against pressure spikes, and ensure reliable and safe operation. When designing or maintaining a hydraulic system, it is essential to consider the type of check valve required for the specific application and ensure that it is installed correctly. With the proper use of check valves, hydraulic systems and tractors can operate at peak performance, increasing productivity and reducing costs.

Summit Hydraulics carries many check valve varieties, from double pilot operated check valves to in-line check vales, that solve cylinder creep. Each one would be a valuable addition to any tractor or hydraulic system.

Double Pilot Operated Hydraulic Check Valve, #6 SAE Ports, 11 GPM

2 thoughts on “What is a Hydraulic Check Valve?

  1. Hank says:

    Should all 6 spool backhoe valves have or should have a check valve to stop load drop while trying to feather? I have filtered and changed oil twice, had cylinders rebuilt, replaced 6 spool valve

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