Nordson EFD 736HPA-NV Manual

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736HPA-NV High Pressure Dispense Valve
Maintenance & Parts Guide

736HPA-NV High Pressure Dispense Valve
2www.nordsonefd.com [email protected] 800-556-3484 Sales and service of Nordson EFD dispensing systems are available worldwide.
Valve Disassembly and
Reassembly Procedures
To replace the lower seal:
1. Remove the three bolts from the outlet cap.
2. Remove the outlet cap.
3. Pry the seal out of the outlet cap using a small
screwdriver.
4. Clean the seal cavity and then press a new seal
into the cavity. Insert tapered end rst, so that the
O-ring faces up.
5. Inspect the uid body O-ring and replace if
necessary.
6. Reinstall the outlet cap. Tighten the three bolts to
30 to 35 inch pounds.
To replace the upper seal:
7. Remove the three bolts from the outlet cap.
8. Remove the outlet cap and uid body.
9. Pry the seal out of the uid body using a small
screwdriver.
10. Clean the seal cavity and then press a new seal
into cavity. Insert seal with O-ring facing inside the
uid body.
11. Reinstall the outlet cap and uid body. Tighten the
three bolts to 30 to 35 inch pounds.
To replace air cylinder seals:
12. Remove the three bolts from the outlet cap.
13. Remove the outlet cap and uid body.
14. Unscrew the adjustable stroke air cap.
15. Remove the piston-and-spool assembly and the
piston return spring.
16. Replace the O-rings on the spool, piston and air
cylinder body.
17. Apply Nye lubricant #865 gel to piston, spool and
air cylinder wall.
18. Reinstall the piston return spring, piston and
spool assembly and then the adjustable stroke air
cylinder cap. Tighten the air cap between
8 to 10 foot pounds.
19. Reinstall the uid body, outlet cap and tighten the
three bolts to 30 to 35 inch pounds.
Do not thread uid inlet ttings too far into the valve.
Doing so can obstruct the piston shaft, causing
leakage, poor dispensing performance, and damage
to the valve.
CAUTION
Air cylinder
body
#7013448
O-ring
#7014687
Fluid body
#7021158
Split washer
#7023626
Upper seal
#7014745 (Hytrel®)
#7014746 (Viton®)
1
2
5
8
7
12
13
Bolts
#7023395
Outlet cap
#7021160
Lower seal
#7014745 (Hytrel®)
#7014746 (Viton®)

736HPA-NV High Pressure Dispense Valve
3www.nordsonefd.com [email protected] 800-556-3484 Sales and service of Nordson EFD dispensing systems are available worldwide.
Adjustable stroke air cylinder cap #7021127
Includes O-ring #7014735
Piston return
spring #7014740
Piston with O-ring #7021154
O-ring (Buna N) #7014738
Shaft lock nut
#7014742
Maintenance Tools:
1/8" Allen wrench
5/32" Allen wrench
(2) 8" adjustable wrenches
Accessories
1/4 NPT Metal Nozzles
Stainless steel, 38.1 mm (1.5") long. ID Size
Part # Gauge mm (inches)
7014850 7 3.81 (0.150)
7014851 8 3.43 (0.135)
7014848 10 2.69 (0.106)
7014842 12 2.16 (0.085)
7014844 14 1.60 (0.063)
7014846 16 1.20 (0.047)
Polyethylene Nozzles
Plastic nozzles with 1/4 NPT thread. Nozzles
may be cut or shaped as required. Supplied
(10) nozzles per package.
Part # Size
7018555 63.5 mm long x 3.2 mm
opening (2 1/2" x 1/8")
7018557 63.5 mm long x 1.6 mm
opening (2 1/2" x 1/16")
7018559 101.6 mm long x 1.6 mm
opening (4" x 1/16")
7018561 101.6 mm long x .8 mm
opening (4" x 1/32")
14
15
16
17
Dispensing Tip Adapter
Accepts all EFD dispensing tips.
Part # Description
7021197 Adapter for use with metal tips
7021186 Adapter for use with disposable
plastic tips
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.
Part # Description
7021136 Mounting rod for the 736HPA valve
Universal Valve Mount
Use with all EFD valves for easy valve
mounting.
Part # Description
7020507 Universal valve mount
Double-Acting Air Closure Kit
The 735AC-KIT (7021143) is used in
applications dispensing very thick uids 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
7021143 Air closure kit
Spool with O-ring #7021156
Includes O-ring
(Buna N) #7014743

736HPA-NV High Pressure Dispense Valve
For Nordson EFD sales and service in over
40 countries, contact Nordson EFD or go to
www.nordsonefd.com.
Global
East Providence, RI USA
800-556-3484; [phone]
[email protected]
Europe
Dunstable, Bedfordshire, UK
0800 585733; [phone]
[email protected]
Asia
China: [phone]; [email protected]
India: [phone]; [email protected]
Japan: [phone]; [email protected]
Korea: [phone]; [email protected]
SEAsia: [phone]; [email protected]
Viton and Hytrel are registered trademarks of E.I. DuPont.
The Wave Design is a trademark of Nordson Corporation.
©2016 Nordson Corporation 7026829 v012416
Troubleshooting Guide
No uid ow
• 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 uid pressure may not be high enough.
Increase pressure.
• The dispensing tip may be clogged. Replace tip.
• Fluid may have solidied in the uid body. Clean
the uid body.
Fluid drools after the valve closes, eventually
stopping
• This is caused by air trapped in the outlet section
of the uid body or the uid 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 ow until air is removed.
• If the uid 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 uid inlet
tting is threaded too far into the valve, thus
obstructing the piston shaft. Ensure that the uid
inlet tting 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 ows out above upper seal
• Fluid owing 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 uid pressure is
uctuating, 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.