User Guide

Troubleshooting Guide
Fluid leaks out the drain hole
• Fluid leaking out the drain hole
on the side of the valve indi-
cates the needle packings are
worn. Replace needle packings.
Inconsistent deposits
• Inconsistent deposits can result
if the air pressure controlling
the valve and/or supplying the
reservoir is fluctuating or if the
valve operating pressure is less
than 70 psi (4.8 bar). Check to
be sure air pressures are constant
and the valve operating pressure
is 70 psi (4.8 bar).
• The time the valve is open must
be constant. Check to be sure
the valve controller is providing
a consistent output.
No fluid flow
• If valve operating air 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 needle stroke adjustment
may be closed. Open stroke
adjustment.
• Material may have clogged the
fluid body or output tip adapter.
Clean the valve.
Steady drip
• A steady drip can be caused by
a worn needle and seat, or a
particle holding the needle off the
seat. Clean and inspect the needle
and seat for wear. Replace worn
or damaged parts.
A NORDSON COMPANY
USA: 800-556-3484 or [phone]
Europe: 0800 585733 or [phone]
Asia: [phone]
[e-mail] www.efd-inc.com
©2006 Nordson Corporation 741V-MAINT-01 v062606