The control of the oil force inside the lock-up clutch is finished by means of two valves: the relay valve plus the sign valve. In this kind of arrangement the sign valve controls the force on a single facet with the relay valve, which controls the tension inside the lock-up https://torque-converter-clutch75294.webbuzzfeed.com/34745181/considerations-to-know-about-torque-converter-clutch