Main Pressure Control Valve Function The main pressure control valve regulates the oil pressure flowed to the clutch loop and solenoid valve loop and distributes the oil flow between the clutch loop and torque converter. Operation 1. The oil comes from the oil pump enters into the main pressure control valve, the oil will pass through the port A and port B and flow to the shift valve when the oil pressure is lower than the specified pressure of main pressure control valve (1). 2.
If the oil pressure is higher than the specified value, the oil passing through the throttle port c and d of main pressure control valve (1) will push the valve cartridge (1) to left and release the oil to port E and keep the pressure under specified value. The oil releases from port E will flows to torque converter. 20-43