Supply 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 Supply Valve controls the pressure function of the two pitot pressures. A higher engine pitot pressure will cause a higher supply valve pressure and a lower primary pitot pressure will cause a lower supply valve pressure. If both pitot pressures rise by the same amount the supply pressure will also increase. The supply pressure forms an input to the clutch PWM solenoid and is also used for belt lubrication and oil supply to the pitot systems.