Graco XP70s-hf 577222 [42/86] Adjust the restrictor

Graco XP70s-hf 577222 [42/86] Adjust the restrictor
Operation
42 3A6283H
8. Adjust the XP-hf motor air regulator (CB) to the
necessary spraying pressure and apply a coating to
a test panel.
NOTE: Run System Verification tests everyday (see
page 49).
NOTE: Excess pressure increases overspray and pump
wear.
9. Check and record gauge readings frequently during
operation. A change in gauge readings indicates a
change in system performance.
NOTE: A pressure drop occurs during pump stroke
changeover. It should be quick and synchronous.
10. Flush the mix manifold as necessary during the
day’s operation. Follow the Flush Mixed Material
on see page 44.
11. Follow the Flushing procedure on page 44. when
you are finished spraying or before potlife expires.
NOTE: Mixed material potlife or working time decreases
with increased temperature. Pot life in the hose is much
shorter than the dry time of the coating
Adjust the Restrictor
The B side restrictor (AJ) reduces momentary “lead/lag”
ratio imbalance of the A and B flow into the static mixer
tubes (AN, AW) when the gun opens. The error is
caused by differences in viscosity, volume, and hose
expansion.
The restrictor is used primarily when the mix manifold is
positioned remotely from the machine with a short mix
hose to the spray gun. It can also be used in the ratio
check procedure.
If the mix manifold (AB) is mounted on the machine, you
do not need to adjust the restrictor. Leave the restrictor
stem open two turns minimum from fully closed.
Use the wrench restrictor (92) to balance the “B”
pressure to the “A” pressure. Turn the restrictor
clockwise to increase pressure, or counterclockwise to
decrease pressure.
AJ
AB
Restrictor
Stem

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