What Is the Main Function of Directional Check Valve for Hydraulic Cylinder?

In a hydraulic cylinder, the check valve may seem like an inconspicuous little component, but it serves many purposes. So, do you know what the main function of a directional check valve is for a hydraulic cylinder?

The main function of the directional check valve for the hydraulic cylinder

• The primary function of a directional check valve is to maintain system pressure stability. For a hydraulic cylinder, if a spool-type directional valve is used, there may be a problem with gap leakage. In this case, it can only temporarily maintain pressure. If pressure holding is required, a hydraulic control check valve needs to be added to the oil circuit to improve sealing and allow the pressure to be maintained for an extended period of time.

• The check valve can be regarded as a support for the hydraulic cylinder. Especially in a vertical cylinder, using other types of valves may lead to leakage, causing the piston and piston rod to slide downward. The third function is to lock the cylinder, as it can seal the oil in the two chambers of the cylinder, and the piston won't move due to external forces.
  

• The check valve can also help achieve quick oil discharge. We know that when a hydraulic cylinder is working, there is a significant difference in the effective working area of the two chambers. Therefore, to prevent the piston from being restricted in its backward movement, a hydraulic control check valve can be set up to allow oil in the right chamber to flow smoothly.
  

• The check valve can also be used to replace the oil injection valve. For example, in a vertical hydraulic cylinder, when the piston is rapidly descending, due to the effects of high-pressure oil and its own weight, its downward speed will be fast and may cause suction and negative pressure. Therefore, supplemental oil equipment should be added.
  

What should do if the directional check valve cannot be opened?

As we all know, the directional check valve is a valve that only allows the fluid to flow along the water inlet, so that the medium at the water outlet cannot circulate. It can also be called a check valve or a check valve. Generally used in hydraulic systems, it can effectively prevent oil from flowing along the flow direction. We have used it for a long time and found that the valve cannot be opened, so we can check it from the structural characteristics and principle of the valve.

• The valve body surface of the check valve has a lot of oil stains, dust, or impurities.

• The handle cannot be pressed down even with force.
  

• Check if there is a power supply.