What Are the Functions of Directional Check Valve?

Directional check valve has several main functions in its use: preventing fluid from flowing back, avoiding high pressure in the system, separating oil lines, forming actuating mechanisms with throttle valves, and preventing reverse actions.

Introduction to directional check valve

Directional check valve, also known as check valve or non-return valve, is a valve that only allows one-way flow of fluid without backflow. If a check valve is used in a hydraulic system, it can prevent oil from flowing in the opposite direction. If a check valve is used in a pneumatic system, it can prevent backflow of compressed air. If a regular one-way valve is used, it only has one function, which is to allow oil to flow in one direction and prevent backflow. If a check valve is installed at the outlet of a pump, it can prevent damage to the pump when the pressure suddenly increases in the system, serving as a check function.

The functions of directional check valve

When the pump is not working, directional check valve can also prevent oil in the system from flowing back to the tank. The check valve can also separate the oil lines to avoid mutual interference between different lines. When the check valve is combined with other valves, it can form a compound valve. If a directional check valve is connected in parallel with a throttle valve or a pressure reducing valve, it can form an actuator, enabling the fluid to flow slowly in the forward direction, and quickly in the opposite direction. Alternatively, it can reduce the flow rate when moving forward, and allow free flow back when moving backward. If a check valve is connected in series with a pressure valve, the pressure can be gradually increased and adjusted, preventing the effect of pressure reversal.

If a check valve is installed at the outlet of a pump, it can prevent the oil pump from being damaged due to sudden increases in system pressure, which is the function of start-stop. If a check valve is connected in parallel with a throttle valve or a pressure reducing valve, the actuator can be slow in the forward direction, and fast in the opposite direction, or slow down when moving forward, and allow free flow back when reversing. If a check valve is connected in series with a pressure valve, the pressure can be gradually increased and adjusted, preventing the effect of pressure reversal.

For hydraulic check valves, the check valve can be opened by controlling the oil circuit to reverse the flow of oil. Check valves are mainly used to control oil flow in one direction. Directional check valve is a directional control valve, which allows airflow to flow in only one direction, and cannot flow back. Check valves are used in applications where airflow cannot flow back, such as when an air compressor is used to fill an air tank. A check valve is installed between the air compressor and the air tank to prevent compressed air from flowing back into the air compressor when it stops working. Check valves are often combined with throttle valves and sequence valves to form a one-way throttle valve.