Operating manual High-pressure double diaphragm pumps Cobra 40-10; Cobra 40-25
8 Cleaning and Maintenance
46
Order number 2340851 | Edition 05/2022
Before each filling, the nozzle must be removed from the spray gun. Here, the specifications
in the spray gun operating manual must be followed. In case of AirCoat systems, carry out
the filling of the system without atomizing air (8).
1. Carry out a visual inspection: Personal protective equipment, grounding and all devices
ready for use.
2. Place an empty, grounded collection tank (5) under the return tube (4).
3. Place the suction hose (7) in a grounded tank with working product (6).
4. Close the pressure regulator (1) (0 MPa; 0 bar; 0 psi)
5. Open the relief valve (3).
6. Slowly open the ball valve (2).
7. Slowly turn the air pressure up on the pressure regulator (1) and only until the pump is
running normally (approx. 0–0.05 MPa; 0–0.5 bar; 0–7.25 psi).
Be prepared for the switch from air to working product and avoid backspray.
8. Close ball valve (2) as soon as pure working product starts coming from the return tube
(4).
9. Close the relief valve (3).
10. Point the spray gun, without nozzle, into the tank (5) and open it.
11. Slowly open the ball valve (2).
Be prepared for the switch from air to working product and avoid backspray.
12. As soon as pure working product without air bubbles is flowing, close the ball valve (2).
13. Close and secure the spray gun.
14. Carry out pressure relief in accordance with Chapter Pressure Relief / Work Interruption
38].
15. Dispose of the contents of the tank (5) according to the local regulations.
8.2.8 Cleaning and Replacing the Filter
8.2.8.1 Straight Inline Filter
B_05274
2
3
5
1
**
27 MPa
270 bar
3916 psi
n
1
Flow direction
1. Flush the pump and inline filter in accordance with Chapter Basic Flushing [
39].
Flush using the spray gun so that the flushing agent flows through the inline filter.
Maximize the flow (remove the nozzle, open the dosing valve if necessary).
2. Empty the pump in a controlled manner in accordance with Chapter Emptying Pump
44].
3. Place the grounded collection tank under the inline filter.
4. If no swivel joint is mounted, remove the hose.
5. Unscrew the inlet housing (2) and outlet housing (5) with two size 19 wrenches.
