Nilfisk-ALTO Poseidon 5 Series, Service Manual, Page: 40 / 68

40
POSEIDON 5 NEW-NA5_en_Ver.1.0_20/12
Function
D
1. Motor/pump Unit.
2. Micro switch.
3. Activation arm.
4. Unloader spring.
5. Unloader piston.
6, Ball for by-pass.
7. Non return valve.
8. Ergo gun.
Pic. D5: Unloader—Open gun.
Mounted with a lance and high pressure nozzle the spray gun (8) is now activated.
The non return valve (7) opens, the pressure in the hose drops and release the pressure on
the backside of the unloader piston (5). The unloader spring (4) presses the unloader piston (5)
backwards and drags the activation arm (3) away from the micro switch (2) and the motor/
pump (1) starts.
The pressure rises to working pressure and remains constant during operation.
1
2
3
6
4
5
7
8
Motor/pump
Pressure Activated Unloader— working pressure (open gun)