The control of the oil pressure during the lock-up clutch is completed by way of two valves: the relay valve plus the sign valve. In such a arrangement the signal valve controls the stress on 1 facet in the relay valve, which controls the tension during the lock-up clutch. By https://torque-converter-clutch21852.like-blogs.com/34028472/little-known-facts-about-torque-converter-clutch