The control of the oil force within the lock-up clutch is completed via two valves: the relay valve and the signal valve. In this sort of arrangement the sign valve controls the force on a person side from the relay valve, which controls the stress in the lock-up clutch. By https://torque-converter-clutch08405.wizzardsblog.com/34193439/the-best-side-of-torque-converter-clutch