This unit makes it possible to achieve increased piston speed on the exhaust
stroke with single-acting & double-acting cylinders. The compressed air
passes from the control valve to the via 1 2 of the quick exhaust valve.
Exhaust 3 is closed at this time. If pressure is released from 1, air is vented
from 1 to 3 via the built-in silencer. For effective performance, the valve must
be fitted directly into the port of the cylinder.