Fluid flows from the nozzle
but will not spray.
Fluid continuously drips from the
nozzle after the valve shuts off.
Valve does not provide clean shutoff,
leaving a buildup on the nozzle.
No fluid flow.
12 / Troubleshooting Guide
Troubleshooting Guide
Valve Trouble Possible cause and correction
If valve operating pressure is too low, the valve will not
open. Increase air pressure to 70 psi (4.8 bar) minimum.
The reservoir air pressure may not be high enough.
Increase pressure.
The nozzle may be clogged. Clean the nozzle.
The stroke adjustment control may be closed. If it is
closed, open counterclockwise one turn.
The control and the nozzle air lines may be reversed.
Check for proper connection (see Setup Schematic on
page 6).
Nozzle air pressure may be too low. Increase air pres
sure.
Nozzle air time delay is too short. Increase time.
A continuous drip can be caused by improper seating of
the needle in the nozzle seat. Remove the nozzle, clean
the needle and nozzle, replace worn or damaged parts.
If the liquid chamber has not been fully turned onto the
air cylinder body during reassembly, the needle will not
seat in the nozzle. Check to be sure the liquid chamber
is properly installed (see Maintenance Instructions on
pages 14-16).
Needle packings may be binding due to leakage, pre-
venting the needle from fully closing. Disassemble the
valve in accordance with the Maintenance Instructions.
Replace the packings if there is evidence of leakage.
Nozzle air pressure may be too low. Increase air pres-
sure.
The air passageway between the nozzle and air cap
may be obstructed. Remove the air cap, and clean the
air cap and nozzle.
If the fluid viscosity is too high, it will not atomize.
Reduce viscosity.
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