© 2024 Nordson Corporation
1044131-06
2
Description
The pressure ball check (10) closes and the siphon ball check (11) opens. The material
above the pressure ball check is forced out high-pressure port (13) while new material is
pulled in through the siphon port (12). The packing glands (9) prevent pressurized coating
material from leaking past the plunger.
As the piston reaches the top of its stroke, the shifting mechanism (4) shifts the air valve
spool, directing supply air to the top of the piston and exhausting the air below the piston.
Pressure Stroke
Air above the piston pushes the piston and plunger down. The siphon ball check closes
and the pressure ball check opens. Material below the pressure ball check is forced up
through the plunger and out the high pressure port. When the piston reaches the bottom
of its stroke, the shifting mechanism shifts the air valve spool and the suction stroke
begins again.
Plunger Lubrication
of the plunger and prevents the upper packings from wearing excessively. The coating
material being pumped lubricates the lower packings.
NOTE: Coating material leaking past the upper packing gland will discolor the solvent
lower packings should be replaced at the same time.
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