Pressure Modifier Valve

Pressure Modifier Valve

Outline
^ The pressure modifier valve reduces the pilot pressure according to the throttle pressure and adjusts to the pressure modifier pressure. The throttle pressure is adjusted by the pressure control solenoid. The pressure modifier pressure is applied to the pressure regulator valve and works as a signal pressure to adjust the line pressure.

Operation
^ Spring force and throttle pressure (11) are applied to the bottom end of the valve and push the valve upward. Conversely, pressure modifier pressure (7) flows through the oil passage inside the valve, is applied to the top end of the valve, and pushes the valve downward. Pressure modifier pressure (7) and throttle pressure (11) maintain the balance. Thus, pilot pressure (9) is reduced becoming pressure modifier pressure.
^ When pressure modifier pressure (7) is lower than throttle pressure (11), the valve moves upward and opens pilot pressure (9) oil passage (See figure). This forces the pilot pressure to flow through oil passage (9) to oil passage (7) and pressurizes the pressure modifier pressure. Pressurized pressure modifier pressure (7) moves the valve downward and closes the pilot pressure (9) oil passage. This causes pressure modifier pressure (7) to not pressurize.
^ When pressure modifier pressure (7) is higher than throttle pressure (11), the valve moves downward and opens drain port (X) (See figure). This causes pressure modifier pressure (7) to depressurize. If pressure modifier pressure (7) is depressurized, the force to push the valve downward will decrease and the valve will move up and drain port (X) will close. This causes pressure modifier pressure (7) to not pressurize. Thus, pressure modifier pressure (7) is adjusted according to throttle pressure (11).