The control of the oil pressure within the lock-up clutch is done by means of two valves: the relay valve along with the signal valve. In this type of arrangement the sign valve controls the pressure on 1 side of the relay valve, which controls the force from the lock-up https://torque-converter-clutch08417.ltfblog.com/33187457/not-known-facts-about-torque-converter-clutch