The hand slide valve is a diverter valve that uses the valve core (plunger, valve disc) to slide on the sealing surface to change the position of the fluid inlet and outlet channels to control the flow direction of the fluid. Spool valves are often used in steam engines, hydraulic and pneumatic devices to enable motion mechanisms to achieve predetermined direction and stroke actions or to achieve automatic continuous operation. The hand slide valve is when the reversing valve is in the neutral position (NeutralPosition) or the original position (Normalposition). The connection method of each oil port in the valve is called the slide valve function of the reversing valve. The slide valve function directly affects the working status of the actuator, and different slide valve functions can meet different requirements of the system. Correct selection of slide valve function is very important.