The control of the oil pressure during the lock-up clutch is completed by two valves: the relay valve and the sign valve. In this type of arrangement the sign valve controls the stress on one particular side from the relay valve, which controls the stress inside the lock-up clutch. By https://torque-converter-clutch75294.webbuzzfeed.com/34745181/considerations-to-know-about-torque-converter-clutch