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7. TROUBLESHOOTING
PROBLEM
No fluid flow
Inconsistent
fluid flow
Fluid drools after the valve
closes, eventually stopping
Steady drip
Fluid leaks between
diaphragm and fluid housing
Fluid leaks out of bleed hole Diaphragm ruptured
POSSIBLE CAUSE
Fluid pressure too low
Operating pressure too low
Dispense tip clogged
Fluid cured in valve chamber
The stroke adjustment closed
Fluid pressure fluctuating
Valve operating pressure is too
low
Valve open time is not consistent
Air trapped in fluid housing
Air trapped in fluid housing
Worn diaphragm
Worn fluid housing
Fluid pressure exceeds 70 psi
(4.8 bars)
Valve re-assembled incorrectly
after cleaning
Mounting screws loose
8
CORRECTION
Increase fluid pressure
Increase air pressure to 70 psi (4.8 bars)
Replaced tip
Clean valve thoroughly
Open stroke adjustment counterclockwise
Make sure fluid pressure is constant
Increased valve pressure to 70 psi (4.8
bars)
Check to make sure the valve controller
is providing a consistent output
Purge valve
Purge valve
Replace diaphragm
Replace fluid housing
Lower fluid pressure
Refer to Maintenance section
Tighten screws
Replace diaphragm
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