5
255 Blankdraulic Installation Tool (HK1014)
1
2
12
10
11
5
6
3
4
9
7
Spring
8
Pressurized Air
Exhaust Air
Pressurized Hydraulic Fluid
Non-pressurized Hydraulic Fluid
Air Piston
moves up
Exhaust Air
Pull Piston
moves back
Hydraulic
Piston Rod
moves up
Throttle Valve
moves down to
(PULL position)
Trigger
Depressed
Hydraulic
Piston Rod
moves down
Throttle Valve
moves up to
RETURN position
Trigger
Released
Pull Piston returns
to home position
Exhaust Air
Principle of Operation
PULL STROKE
When the Trigger is depressed (1), the Throttle Valve
moves to the down position (2), and
pressurized air is directed to the bottom of the Air
Piston, causing it to move upward (3). The air above the
Piston is exhausted and directed through the center of
the Throttle Valve and out the bottom of the tool (4).
The Air Piston has a Rod and a Hydraulic Piston attached.
When the Air Piston rod moves upward, a column of
pressurized hydraulic fluid is forced up (5) into the tool
head, which moves the Pull Piston back (6). The attached
nose assembly moves with the Pull Piston to start
fastener installation.
RETURN STROKE
When fastener installation is completed, the
Trigger is released (7). Air pressure, with the
assistance of a Spring (8), causes the Throttle Valve to
return to its up position (9). Pressurized air is re-directed
to the top of the Air Piston,
causing it, along with the Hydraulic Piston Rod, to move
downward (10). The air from below the Air Piston is
exhausted through the bottom of the tool (11). As this
occurs, hydraulic pressure is reversed and the Pull Piston
is returned forward (12). A return pressure relief valve
protects the tool against pressure spikes. The reservoir
replenishes the hydraulic system as needed.
