EFD 781S MAINTENANCE GUIDE
IMPORTANT!
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781S Series Dispense Valve
MAINTENANCE & PARTS GUIDE
Electronic pdf files of EFD®manuals are also available at
www.efd-inc.com/manuals.html.
For EFD sales and service in over 30 countries,
contact EFD or go to www.efd-inc.com/contact
EFD, Inc.
East Providence, RI USA
800-556-3484; +1-401-434-1680 (outside the USA)
info@efd-inc.com www.efd-inc.com
EFD International Inc.
Dunstable, Bedfordshire, UK
0800 585733 or +44 (0) 1582 666334
Ireland 00800 8272 9444
europe@efd-inc.com www.efd-inc.com
EFD, Inc., Asia
China: +86 (21) 5854 2345
china@efd-inc.com www.efd-inc.com/cn
Singapore: +65 6896 9630 sin-mal@efd-inc.com
®
A NORDSON COMPANY
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Valve maintenance
To thoroughly clean the fluid body and
replace needle packings:
1. Remove needle stroke control knob
and spring.
2. Remove air cap retainer, then air
cap, nozzle and fittings.
3. Remove fluid body from air cylinder
body using a .11” hex wrench, then
remove O-ring.
4. Clean fluid body, air cap and nozzle
in appropriate solvent.
5. Use extraction tool #7803
to remove needle packings
from fluid body.
6. Remove any remaining pack-
ings and spring from needle.
Note: Before reassembling,
clean fluid body, air cap and
nozzle in appropriate solvent and
replace O-ring. Clean needle with
cloth dampened in solvent.
Reassemble the valve in reverse
order of disassembly. Ensure that
the small O-ring and washer on
the bottom of the air cylinder body
are back in place before reinstalling
the packing spring. Lubricate parts
indicated with Nye Lubricant #865
included in the Maintenance Kit.
Valve Disassembly and
Reassembly Procedures
CAUTION: To prevent damage, the valve
must be disassembled starting at the fluid
outlet end of the valve.
www.efd-inc.com info@efd-inc.com USA 800-556-3484 Europe +44 (0) 1582 666334 Asia +86 (21) 5854 2345
Sales and service of EFD dispensing systems are available worldwide.
Nozzle air
cap retainer
#7819SS
(stainless steel)
Nozzle
(Viton)
#7825
Fluid inlet fitting
#7543BP - for .25" OD tube
#7610BP - for .375" OD tube
Screws
H6-32X3/8SHC
O-ring
Needle
packing
assembly
#7810
Air cylinder body
#7879-SS
(stainless steel)
#7879
(hard-coated aluminum)
Packing
spring
#7808
Nozzle/air cap
Round Fan
#7857-46SS #7857F-46SS
#7857-28SS #7857F-28SS
#7857-14SS #7857F-14SS
#7857-46WA-SS #7857-46WF-SS
O-ring
(Buna-N)
#4049
Fluid body
#7878-SS (stainless steel)
#7878 (hard-coated aluminum)
Retaining
washer #7807
O-ring (Buna-N)
#7806
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