Constant Pressure Valve
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2007 MINI Cooper, 2006 MINI Cooper, 2005 MINI Cooper, 2004 MINI Cooper, and 2003 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.
The Constant Pressure Valve establishes a base pressure that is used to supply the supply valve. The constant pressure valve acts as a filter for the supply valve and reduces disturbances in the secondary pressure. The constant pressure is also used for the ratio control depending on locking of the clutches. As the ratio approaches overdrive the constant pressure will be supplied to the clutch valve instead of the clutch PWM solenoid pressure.