How to identify the number of ports of a hydraulic valve?

Directional control valve, also known as reversing valve, plays the role of preventing and guiding oil in and out of the channel in the specified flow direction in the hydraulic system, that is, it plays the role of controlling the flow direction of oil in the oil circuit. There are two important concepts in the reversing valve, namely position and passage. Position refers to the number of working positions of the reversing valve spool, and the position is represented by a square in the diagram; Pass refers to the number of oil inlet and outlet ports, and arrows are used to represent the oil inlet and outlet in the diagram.

So how to identify the number of ports of a hydraulic valve?

The more common hydraulic directional valves are two-position (left, right) and three-position (left, right, center). The oil flow direction is different in each working position; several-way actually refers to the change Several oil pipes are connected to the outside of the valve, the common ones are two-way, three-way, four-way and five-way. The number of squares represents several valves, and the number of oil ports represents several valves. Together they are called several valves. Such as two-position two-way valve and three-position four-way valve.