The Charge of the oil stress while in the lock-up clutch is done via two valves: the relay valve along with the signal valve. In this sort of arrangement the sign valve controls the strain on 1 facet of your relay valve, which controls the stress inside the lock-up clutch. https://torque-converter-clutch98417.ampblogs.com/helping-the-others-realize-the-advantages-of-torque-converter-clutch-70942341