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OPERATING PROCEDURES
WET CUP LOADING
Some models are equipped with a wet cup around the Spool (2) to keep it wetted. This helps prevent curing or
crystallization of material on the spool and consequent premature seal failure. Fill the wet cup with a compatible
self-leveling material prior to operation if your valve is so equipped.
WET SYSTEM CHECKOUT
Using the purge cycle on the air supply controller, run the material through the material supply line and valve until
a smooth material flow is observed through the dispense nozzle.
After the purge cycle has been completed, set the air supply controller to the manual cycle mode and cycle the
dispense valve several times.
OPERATION ADJUSTMENTS
AIR SUPPLY ADJUSTMENT
The air pressure to the controller and material supply regulator is typically 70 psi (4.8 bar). Do not exceed 100 psi
(6.9 bar) pressure to the dispense valve. However, the material supply pressure must be adjusted according to
the type of material being dispensed. Too low a pressure will give you an inconsistent dispensed volume because
the material does not have sufficient pressure to flow smoothly through the nozzle. Too high a pressure may
cause material separation or packing. Use the minimum pressure needed to obtain smooth material flow during
the purge cycle.
MATERIAL OUTPUT AND SNUFF-BACK ADJUSTMENT
The material output depends on the material pressure, size of nozzle or needle, the dispense time and the rate at
which the dispense valve is moved by the system to which it is attached.
The Model 715 Snuffer allows material to be drawn back into the dispense nozzle/needle when the Spool (2)
retracts to minimize post-dispense dripping or drooling. This is the “snuff-back” feature. Snuff-back can be
adjusted only while dispensing. The snuff-back adjustment knob on the top of the valve controls this. Turn the
knob “in” or clockwise to decrease snuff-back or turn the knob “out” or counterclockwise to increase snuff-back. If
desired results are not achieved try adjusting through the full range of travel.
DISPENSE NOZZLE/NEEDLE HEIGHT ADJUSTMENT
Ideally, the material should just contact the work piece enough to create an adhesive bond and cause a clean
separation of the material from the outlet tip upon completion of the dispense cycle.