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As soon as the upper strap is sheared off, the sealing valve lever 25 can be released. Sealing valve 5
switches to deaeration, the compressed air in cylinder 20 starts to flow back and escapes through the
pressure reduction valve 15 (back stroke area), sealing valve 5 and the lower part of the cylinder 20 into the
athmosphere.
The pressure in the line between pressure reduction valve 15 and sealing valve 5 drops continually.
As a result of this, the pressure on the left control side of diaphragm 13 is reduced.
The surface relation of the left to the right control side is modulated in such a way that diaphragm 13 switches
in dependence to the piston movement of the sealing cylinder and opens the input to the left control side of
holding air valve 14.
Holding air valve 14 interrupts the holding air. The pressure in the air motor 22 drops; the air motor can be
turned back by the tension in the strap. The two straps provided with the sealing profile can now interlock.
At this point the piston (piston with dies and cutter) is positioned approx. one to two mm (.040" to .080") from
its lowest position on its way to its initial position.
Removing the tool
The tool is opened by pulling the Flapper valve lever 23; the tool is then pushed away from the seal to the
right.
14.1 Adjustments
Tension speed / tension force
Throttle valve 7 limits the tension speed and also the tension force in the lower range of adjustments.
Factory presetting adjustment: 90 % of the maximum speed.
Sealing cylinder
The air pressure reduction valve 15 limits the entry pressure to the sealing cylinder 20.
Factory presetting adjustment: 5.3 bar (76 psi).
Important! The presetting adjustments must not be exceeded.
Timing of the interlock
Under normal conditions the holding air throttle 29 is screwed flush into the outside of the control valve body.
If the straps do not interlock properly (one or two notches do not interlock at all) the throttle has to be turned in
a clockwise direction; this causes a reduction of the holding air on the motor and the tensioned strap is held
with less power so that it will interlock quicker after sealing.
Attention!
Adjust holding air throttle in such a way that no tension marks on the bottom of the seal caused by the punch
will be noticed. If marks are noticed the punch might wear prematurely.
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