Square Wave 745NC Non-Contact Dispense Valve
11
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Troubleshooting Guide
Trouble
Solution
No fluid flow
If valve operating air pressure is too low, the valve
will not open. Increase air pressure to 4.8 bar (70 psi)
minimum.
The reservoir air pressure may not be high enough.
Increase pressure.
The valve stroke adjustment may be closed. Open
stroke adjustment.
Material may have clogged the fluid body or outlet
nozzle orifice. Clean the valve / nozzle plate.
Inspect cable wires from bullet solenoid to make sure
they are not loose or damaged.
Bullet solenoid may not be actuating. Replace
solenoid.
Steady drip
A steady drip can be caused by a worn needle and
seat, or a particle holding the needle off the seat.
Clean and inspect the needle and seat for wear.
Replace worn or damaged parts.
Fluid leaks out
drain hole
Fluid leaking out the drain hole on the side of the valve
indicates that the spring energized fluid seal is worn.
Replace seal.
Inconsistent
deposits
Inconsistent deposits can result if the air pressure
controlling the valve and / or supplying the reservoir
is fluctuating or is less than 4.8 bar (70 psi). Check
that air pressures are constant and valve operating
pressure is 4.8 bar (70 psi).
The time the valve is open must be constant. Check
to be sure the valve controller is providing consistent
output.
If trouble cannot be corrected or if you need further assistance, please contact us.
