Description
2-5
Part 104373
−
03
E
2015 Nordson Corporation
NOTE:
The air valve is an open-center type valve. If the valve spool stops
in the center of the valve block when the pump is turned off, the pump will
not restart because the spool will direct working air into both cylinders. To
start the pump, press the manual override button on the double pilot valve.
This directs pilot air to one side of the air valve and shifts the valve spool
out of the center position.
The air valve directs working air into the left cylinder. The working air forces
the left piston/plunger down. The siphon ball check valve closes and the
coating material in the left hydraulic housing is pressurized and forced out of
the housing, through the high-pressure ball check valve, outlet manifold,
and fluid lines to the spray devices.
The right piston/plunger is forced up by the return spring. The air above the
piston flows out of the cylinder, through the air valve, and into the right
muffler. The right plunger draws new coating material into the siphon
housing, through the siphon ball check valve, and into the right hydraulic
housing. The high-pressure ball check remains closed, retaining the
material in the housing.
Just before the left plunger reaches the bottom of its stroke, the chamfered
land on the piston shaft depresses the roller valve lever on that side of the
pump and actuates the valve.
1
3
2
5
Mufflers
4
Pump Control
Regulator
Pilot Air
Regulator
Lubricator
Accumulator
Filter
Shutoff
Valve
Double Pilot
Valve
Air Valve
Air Cylinders
Roller
Valves
Figure 2-3
Pump Pneumatic Schematic
