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Troubleshooting
Problem
Air leaks from dispense valve.
Material leaks from front of dis-
pense valve.
Material leaks from dispense valve
body.
Dispense valve does not shut off.
Dispense valve does not open or
dispense material.
3A8814A
1. Follow Pressure Relief Procedure, page 9, before
checking or repairing the valve.
2. Check all possible problems and causes before
disassembling valve.
Cause
Loose air connections.
Worn o-rings.
Loose end cap.
Worn o-rings.
Obstruction inside dispense valve.
Worn ball.
Worn seat.
Seals (u-cup and o-rings) not
installed correctly.
Worn seals.
Loose air connections.
Worn seat interface.
Broken piston or debris in air cylin-
der.
Loose air connections.
Broken rod, piston, or ball.
Troubleshooting
Solution
Check air connections.
Replace o-rings in air housing.
Tighten end cap.
Replace o-rings.
Remove outlet housing. Check and
replace ball and seat, if damage has
occurred.
Check and replace ball. It is recom-
mended that you also replace the
seat.
Check and replace or reverse seat.
If replacing the seat, also replace
the ball.
Check cartridge seals (u-cup and
o-rings) and replace cartridge
(u-cup) and rod.
Check air connections.
Replace ball and seat.
Disassemble dispense valve. Check
and replace, if necessary, piston,
piston rod, and o-rings.
Check air connections.
Disassemble dispense valve. Check
piston, piston rod, ball, and o-rings.
Replace damaged part.
13
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