Technical data

Troubleshooting
12 312185S
Troubleshooting
Problem Cause Solution
Valve does not open. Insufficient air pressure. Turn on air or increase air pressure.
Air not exhausted from the front side
of air cylinder piston.
Use 4-way, relieving type air valve.
Valve does not close and leaks. Insufficient air pressure. Turn on air or increase air pressure.
Air not exhausted from the back side
of air cylinder piston.
Use 4-way, relieving type air valve.
Blockage between needle and seat. Remove and clean needle and seat.
Damaged or missing gasket between
seat and housing (hard seat only).
Replace gasket (38).
Damaged or worn needle or seat. Replace both the needle and seat.
Too little snuff-back. Unscrew snuff-back adjustment nee-
dle (25) 1/4 turn at a time.
Higher than normal back pressure. Nose piece is clogged. Remove and clean.
Mixer is curing. Replace mixer.
Soft spots in mixed material. Nose piece is clogged on one side. Remove and clean.
System is not properly balanced. Balance system with hoses, check
valves, restrictors.
High static pressures build when
valve shuts off.
Turn off proportioner pump when
valve closes.
Low flow rate. Snuff-back rings (13) are installed
(hard seat only).
Remove snuff-back rings if they are
not required for maximum snuff-back.