Operation - Nordson A7A Customer Product Manual

6
A7A Lancing Spray Guns

Operation

See Figure 2. When the spray guns are open,
compressed air enters the air inlet fitting (2) and
lifts the piston (1) and shaft (4), compressing the
packing cartridge spring (3) and pulling the ball (7)
off the seat (6). When the air pressure is removed,
the packing cartridge spring forces the ball back
into the seat and stops the flow of coating material.
2
3
1
2
1
Figure 2 A7A Lancing Spray Gun Components and Operation
1. Piston
2. Air inlet fitting
3. Packing cartridge spring
4. Shaft
Part 107009-05
4
A7A Circulating Lancing Spray Gun (Shown with nozzle)
10
11
4
3
A7A SM Lancing Spray Gun
(Shown without nozzle; fluid fittings and transducer plugs not shown)
5. Fluid fittings
6. Seat
7. Ball
8. Nozzle (Optional)
When the standard A7A spray gun is closed,
coating material circulates through the fluid fitting
(5), through the shaft (4), around the seat (6), then
back to the return fitting.
When the A7A SM Lancing Spray Gun is closed,
coating material circulates through the gun body
only.
5 (Return)
7
6
9
6
7
9
9. Barrel
10. CO-plate plug
11. CO-plate (Optional)
E 2018 Nordson Corporation
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