The invention pertains to a hydraulic control system for servos in automatic transmissions, which, in a known fashion, utilizes a main pressure valve to regulate the pressure within the control system and further utilizes a converter pressure valve to supply a hydrodynamic torque converter and the lubrication...http://www.google.se/patents/US4345489?utm_source=gb-gplus-sharePatent US4345489 - Hydraulic control system for servos in automatic transmissions
