Description
2-6
Part 104373
−
03
E
2015 Nordson Corporation
Theory of Operation
(contd)
Pilot air flows through Line 4, the roller valve, Line 3, and into the double
pilot valve, shifting the valve spool and directing the pilot air entering the
double pilot valve through Line 1 to the air valve, forcing the air valve spool
to shift. The air valve directs working air to the right cylinder.
NOTE:
Pilot air pressure is factory set to 4.1 bar (60 psi). Do not change
this pressure.
The strokes of the piston/plungers overlap. This keeps the fluid pressure in
the delivery lines to the guns constant and reduces wink or spray pattern
fading at the gun.
Fluid
Air
2
1
3
4
5
6
8
9
10
11
12
7
To Spray
Device
From Fluid Supply
Figure 2-4
Pump Operation
1. Air valve
2. Muffler
3. Piston
4. Cylinder
5. Solvent chamber
6. Plunger
7. Packing gland
8. Hydraulic housing
9. Siphon ball check valve
10. Siphon manifold
11. High-pressure ball check valve
12. Outlet manifold
