702-16-01420PILOT VALVE

Force amplification: * * The operator only needs a small force to move the handle, and the pilot valve can use the pressure of the hydraulic oil itself to generate a corresponding control oil pressure (pilot pressure).
*Proportional control: The distance or force applied by the handle movement is usually proportional to the output pilot pressure. The more the handle moves, the greater the output pilot pressure; The less movement of the handle, the smaller the output pilot pressure.

Working principle (taking the most common hydraulic pilot valve as an example):**
*The operator moves the control lever or handle inside the cab.
*The mechanical movement of the handle pushes the spool (slide valve or valve stem) inside the pilot valve to move.
*The movement of the valve core changes the connectivity status of the oil circuit:
*Guide the low-pressure oil (usually referred to as pilot oil) from the pilot pump to the oil port (A or B port) leading to one end of the main control valve spool.
*At the same time, connect the oil port on the other end of the main control valve spool to the oil tank (return port).
*In this way, under the action of

The movement direction and opening size of the main control valve spool are directly controlled by the pressure and direction output by the pilot valve.
*The main control valve ultimately controls the high-pressure main oil circuit that flows to the actuator (hydraulic cylinder blade lift/tilt/ripper lift; hydraulic motor travel), driving the actuator to move at the desired speed and direction.