User Guide

Needle stroke control
#7432 (aluminum)
Air cylinder body
#7429 (aluminum)
#7429SS (stainless steel)
Air input hose
#78518A
Thrust washers
#7809
O-ring (Buna-N) #7517
Piston return spring
#7802
Snap ring
#7526
Piston and needle
assembly #7805-SS
O-ring (Buna-N)
#7519
1
5 6
8
9
10
11
15
18
19 20 21
12
13. Reassemble the valve in reverse
order of disassembly.
14. Leak test the valve (see below).
Leak testing
15. Set the needle stroke control at
two turns open.
16. Shut off actuating air. Install an air
hose in the fluid inlet and connect
it to a 100 psi (7 bar) air supply.
17. Submerge tip adapter/seat
assembly in water. If air bubbles
appear, reseat the parts (see next
steps).
Reseating the needle and tip adapter
assembly
18. Disconnect all air to the valve.
19. Rotate the stroke adjustment knob
to the closed position.
20. To compress the needle into the
tip adapter, further rotate the stroke
adjustment clockwise one additional
reference mark.
21. Return stroke adjustment to normal
setting and cycle the valve. If a slight
leak remains, repeat steps 1 and 2.
22. If the leak persists, replace the tip
adapter.
Maintenance Kit
#741V-RK
Includes all O-rings, needle packing
assembly and lubricant.
Tools required:
6” Adjustable wrench
Snap-ring pliers
Packing extraction tool (#7803)
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Sales and service of EFD
®
dispensing systems are available worldwide.