41
11 FUNCTION TEST AFTER REPAIR WORK
After all repair work, the spray gun must be checked for safe condition before
recommissioning. The necessary scope of inspection and testing depends on the repair
carried out and must be documented by the repair personnel.
Assembly inspection
Activity
Means
1. Leak test
– Connect 1 bar; 0.1 MPa; 14.50 psi and 8 bar; 0.8 MPa; 116 psi air pressure
to the air connection and product connection.
Air connection 1 bar / 8
bar
Place the spray gun completely into the water bath and check all sealing
points with 1 bar; 0.1 MPa; 14.50 psi and 8 bar; 0.8 MPa; 116 psi for leaks.
At 8 bar; 0.8 MPa; 116 psi bar, the gun must be completely sealed.
At 1 bar; 0.1 MPa; 14.50 psi, a slight leak can be tolerated: 5 air bubbles
per minute.
Water bath
Injection and Final Inspection
Activity
Means
2. Trigger lever function test
– The trigger lever must be pulled as far as it will go.
Manual inspection
Make sure that the trigger lever can move slightly in its rest position.
– Put the trigger lever locking device into the locking position, configure
the air product pressure, and pull the trigger lever.
Neither air nor product may leak or escape.
– Check that the trigger lever locking device is not reset by the trigger
lever when pulling in the locking position.
3. Leak test
– Connect the gun, slowly increase the product pressure in increments
using a suitable medium until the maximum pressure (250 bar, 25 MPa;
3625 psi or 160 bar, 16 MPa; 2320 psi) specified on the spring cap is
reached.
Visual inspection
– Trigger and flush the spray gun multiple times.
The 160 bar variant is
inspected at 160 bar.
– Check the following:
- Is the product connection sealed when the gun is closed?
- Is the product valve sealed?
- Is there no product discharge at the valve rod seal?
250 bar or 160 bar product
connection
Atomizing air 3 bar
Size 7 open-end wrench
for the sealing screw
If product leaks, tighten the sealing screw:
The sealing screw on the valve rod must be tightened.
Tighten the sealing screw with the open-end wrench if necessary.
(In doing so, it is important to make sure that the valve rod still runs
smoothly and the gun closes reliably).
VERSION 06/2018
ORDER NUMBER DOC2311730
Summary of Contents for GM 4700AC
Page 1: ...AirCoat Manual Gun for Flat and Round Jet Nozzles Version 06 2018 B_02376...
Page 2: ......
Page 48: ...48...
