When the trigger is depressed the throttle valve
moves to down position, pressurized air is directed
to the bottom of the air piston, causing the piston
to move upward (Fig.1a). The air above the piston
is exhausted and directed through the center of the
throttle valve and out the bottom of the tool. As
the hydraulic rod moves upward, a column of fluid
is forced into head, which moves the pull piston
back. The attached nose assembly moves with the
pull piston to start fastener installation.
When fastener installation is completed, the trigger
is released. Air pressure with the assistance of a
spring causes the throttle valve to return to its up
position. Pressurized air is re-directed to the top of
the air piston (Fig.1b), causing the air piston and
hydraulic rod to move downward. The air from
below the piston is exhausted through the bottom
of the tool. Spring pressure returns the pull piston
to its home position. The damper valve impedes
oil flow at pinbreak helping prevent “Tool Kick”.
Fig. 1(a)
Fig. 1(b)
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