D6X Differential Air Shaft
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D6X Differential Air Shaft
270044468 1
Page 8
As operating air pressure is applied to the shaft, the factory-set inlet valve causes a drop in
pressure as air enters the bladder. The exhaust bleeder valve controls the amount of that
pressure drop. The larger the exhaust opening, the greater the pressure drop, resulting in lower
internal bladder pressure. Reducing the exhaust opening increases the internal air pressure.
•
Both valves are factory-set according to customer operating specifications: roll specs
(width, diameter and weight), and web tension (PLI).
•
If you are unable to achieve optimal tension control by adjusting your applied air
pressure, use the exhaust bleeder valve to improve the resolution of your tension
controller. For the majority of applications, no adjustment is required for the exhaust
bleeder valve. For higher internal pressure, adjust to a smaller opening in the valve. For
lower internal pressure, adjust to a larger opening. Adjustments are made with a 1/8" hex
key.
•
The restrictor valve at the inlet should not require adjustment.
•
Do not operate shaft with missing valves.
•
A muffler may be installed* on the exhaust bleeder valve outlet to reduce noise. A slight
hiss may be audible: this indicates that the Pressure Control Valve System is functioning,
allowing air to escape from the shaft as designed. The muffler must be removed (12 mm
socket) before attempting to adjust or remove the bleeder valve. (See Bleeder Valve
Maintenance, page 13.)
*Not available on all Differential shaft designs.
•
The purpose of this graph is to
illustrate the characteristics of
bleeder valve function. The
tension values displayed are
arbitrary.
•
Actual winding tension will differ by
variables such as bladder length,
shaft speed, roll specs (width,
diameter and weight), and core
material.
1) Stop winding operation and shaft rotation.
2) To adjust the internal air pressure, turn the valve in 1/8 turn increments using a 1/8" hex
drive wrench.
•
To increase the pressure, turn the valve Clockwise.
•
To decrease pressure, turn the valve Counterclockwise.
To clean or replace the valve, see pages 13 and 14.
DO NOT perform Adjustment while shaft is spinning
NOTICE
Exhaust Bleeder Valve Function
VALVE CLOSED
1/8 TURN OPEN
1/4 TURN OPEN
APPLIED AIR PRESSURE - PSI
W
E
B T
E
NS
IO
N
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P
L
I
