efd 736hpa Guida Utente
Troubleshooting Guide
No fluid flow
•
If valve operating pressure is too low, the
valve will not open. Increase air pressure
to 70 psi (4.8 bar) for timed shots and
40 psi (2.7 bar) minimum for stripes.
valve will not open. Increase air pressure
to 70 psi (4.8 bar) for timed shots and
40 psi (2.7 bar) minimum for stripes.
•
The fluid pressure may not be high
enough. Increase pressure.
enough. Increase pressure.
•
The dispensing tip may be clogged.
Replace tip.
Replace tip.
•
Fluid may have solidified in the fluid
body. Clean the fluid body.
body. Clean the fluid body.
Fluid drools after the valve closes,
eventually stopping
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.
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.
degassed before dispensing.
Fluid drips at a steady rate after the valve
closes
closes
•
A steady drip indicates failure of the seal
due to particle build-up or wear. Replace
the seal.
due to particle build-up or wear. Replace
the seal.
Valve responds slowly when opening and
closing
closing
•
Valve response is related to control air line
length and size. EFD valves are supplied
with 5-feet of 1/8” 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.
length and size. EFD valves are supplied
with 5-feet of 1/8” 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.
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 70
psi (4.8 bar). Check air pressures and
the valve operating pressure.
pressure controlling the valve and/or
fluid pressure is fluctuating, or if the
valve operating pressure is less than 70
psi (4.8 bar). Check air pressures and
the valve operating pressure.
•
The time the valve is open must be con-
sistent. Check to be sure the valve con-
troller is providing a consistent output.
sistent. Check to be sure the valve con-
troller is providing a consistent output.
Accessories (continued)
Valve Mounting Rod
Mounting rod dimensions are 177.8 mm
long x 12.7 mm (7” x 1/2”) diameter with
5/16 – 24 UNF thread.
long x 12.7 mm (7” x 1/2”) diameter with
5/16 – 24 UNF thread.
Part #
Description
73522
Mounting rod for the 736HPA
valve
valve
Universal Valve Mount
Use with all EFD valves for easy valve
mounting.
mounting.
Part #
Description
7002VM
Universal valve mount
Double-Acting Air Closure Kit
The 735AC-KIT is used in applications
dispensing very thick fluids at high cycle
rates. The air closure assists the spring to
provide a quick, clean cut-off at the end
of the dispense cycle.
dispensing very thick fluids at high cycle
rates. The air closure assists the spring to
provide a quick, clean cut-off at the end
of the dispense cycle.
Part #
Description
735AC-KIT
Air closure kit
A NORDSON COMPANY
USA: 800-556-3484 or +1-401-434-1680
Europe: 0800 585733 or +44 (0) 1582 666334
Asia: +86 (21) 5854 2345
technical@efd-inc.com
Europe: 0800 585733 or +44 (0) 1582 666334
Asia: +86 (21) 5854 2345
technical@efd-inc.com
www.efd-inc.com
©2006 Nordson Corporation 736-MAINT-01 v062606