Gun Module Components And Operation - Nordson A7A Quattro Modular Customer Product Manual

8 A7A Quattro Modular Automatic Spray Gun

Gun Module Components and Operation

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Figure 4 A7A Quattro Modular Spray Guns
1. Air cylinder
2. Compression spring
3. Piston assembly
4. Gun body
1602111-03
The spray gun consists of a Quattro manifold and four gun modules, each with a fluid/air/
mounting manifold. This sectional view shows the main components of the gun modules.
5. Packing cartridge
6. Ball tip
7. Seat
The packing cartridge (5) stem connects the piston (3) to the ball tip (6). When the gun is
triggered on, air pressure pushes against the bottom of the piston, lifting the ball tip away
from the seat (7) and allowing coating material to flow through the seat and nozzle.
When the gun is triggered off, the air pressure forcing the piston up is released. The
compression spring (2) and packing cartridge spring force the ball tip against the seat,
stopping the flow of coating material out of the nozzle.
The packing cartridge seals prevent coating material from entering the air cylinder. If the
packing cartridge seals start to leak, coating material will flow out the weep holes in the
gun body.
0.016-0.023 in.
8. Seat retainer
9. Manifold
10. Nozzle nut
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