736HPA-NV High Pressure Dispense Valve
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Troubleshooting Guide
No fluid flow
• If valve operating pressure is too low, the valve will
not open. Increase air pressure to 4.8 bar (70 psi)
for timed shots and 2.7 bar (40 psi) minimum for
stripes.
• The fluid pressure may not be high enough.
Increase pressure.
• The dispensing tip may be clogged. Replace tip.
• Fluid may have solidified in the fluid body. Clean
the fluid body.
Fluid drools after the valve closes, eventually
stopping
• This is caused by air trapped in the outlet section
of the fluid body or the fluid has entrapped air.
The air will expand after the valve closes, causing
extrusion until the air reaches atmospheric
pressure. Purge the valve by dispensing at a
steady flow until air is removed.
• If the fluid has entrapped air, it must be degassed
before dispensing.
Fluid drips at a steady rate after the valve
closes
• A steady drip indicates failure of the seal due to
particle build-up or wear. Replace the seal.
• Fluid leakage can also occur when a fluid inlet
fitting is threaded too far into the valve, thus
obstructing the piston shaft. Ensure that the fluid
inlet fitting is properly installed.
Valve responds slowly when opening and
closing
• Valve response is related to control air line length
and size. EFD valves are supplied with 5 feet of
4 mm (5/32") ID tubing attached. Any additional
length or size change will affect response time.
Check to be sure the length and size have not
been changed.
Fluid flows out above upper seal
• Fluid flowing out above the upper seal indicates a
worn upper seal. Replace seal.
Inconsistent deposits
• Inconsistent deposits can result if the air pressure
controlling the valve and / or fluid pressure is
fluctuating, or if the valve operating pressure is
less than 4.8 bar (70 psi). Check air pressures and
the valve operating pressure.
• The time the valve is open must be consistent.
Check to be sure the valve controller is providing
a consistent output.
