The control of the oil strain inside the lock-up clutch is finished via two valves: the relay valve as well as the sign valve. In such a arrangement the sign valve controls the strain on a single facet on the relay valve, which controls the pressure inside the lock-up clutch. https://torqueconverterclutch97528.mybloglicious.com/54494285/what-does-torque-converter-clutch-mean