Honda Acura NSX 1991 Service Manual page 415

Lock-up Valve Body
The lock-up valve body is mounted on the regulator valve body with the lock-up shift valve and lock-up timing B valve
built in.
The capacity of the lock-up clutch is controlled by the lock-up valve body.
LOCK-UP SHIFT VALVE
LOCK-UP VALVE
CK-UP TIMING B VALVE