What is the difference in the working principle between Y-type and O-type hydraulic directional valves?

Question: What is the difference in the working principle between Y-type and O-type hydraulic directional valves?

Answer: For Y-type and O-type hydraulic directional valves, which are commonly used in hydraulic systems, many use them to mix them up, making it difficult to understand the working principle between them. Therefore, today I will talk to everyone about the differences in the working principles between them.


The middle position function of the Y-type is mostly used for floating control, such as controlling the main and auxiliary winches of cranes. This circuit can return the hydraulic oil from the two chambers of the Hydraulic Motor, causing the motor to float. The O-type intermediate function is mostly used in the locking circuit, such as the locking circuit without Hydraulic Lock, for the locking of the actuator, which means it stops at any position. There are various types of intermediate positions for directional valves, most of which are selected based on operating conditions. For example, M-type, C-type, and so on.


The Y-type and O-type are actually representatives of a skill, which means that the appearance of the valve is similar, but its function is different. The only difference between the Y-type electromagnetic Directional Valve and the O-type is that in the middle position (when not powered on), the Y-type has a closed P port, the ABT three oil ports are the same, the piston floats, moves under external force, and the pump does not unload. (You can find a Y-shaped valve to take a look. The middle position of the Y-shaped valve has three oil ports connected and one closed)


The middle position of the O type is that all four oil ports of the PABT are closed, the hydraulic pump is not unloaded, and the hydraulic cylinder is locked, which can be used for parallel operation of multiple directional valves.


As for which type of Hydraulic Directional Control Valve to choose, it depends on the system's requirements for action. Different action requirements also require different valves.