1. Directional control valve is a valve that communicates or controls the direction of fluid flow, including one-way valve and reversing valve. One-way valve is a valve that only allows fluid to flow in one direction, including spring return check valve, hydraulic control check valve, shuttle valve, automatic shut-off valve, quick exhaust valve, etc. The process of one-way valve conducting in the positive direction, the pressure loss To be small, when the reverse cut-off is performed, the sealing performance is better. The reversing valve uses the relative position of the spool to the valve body to change the oil circuit to connect, close, or change the direction of the oil flow, thereby starting the hydraulic components, changing the direction of the oil flow or even stopping.

2. The pressure control valve is a valve whose basic function is to adjust the pressure, including relief valve, sequence valve, pressure reducing valve and other flow control valves whose main function is to control the flow, including throttle valve, deceleration valve, speed regulating valve, diverter valve valve etc.