Working/By-Pass Pressure; By-Pass Valve Function - Nilfisk-ALTO Neptune PE Service Manual

Working pressure
Machine is started and the gun "J" with correct lance/nozzle is open -
Machine runs in working pressure "K":
The water is pressed from the pump outlet "A" into the by-pass housing "C".
The water runs through the bottom of by-pass housing "C" and directely to the outlet "I".
Due to the water pressure the by-pass piston "B" is pressed up and the seat "E" is closed.
Machine is started and the gun is closed - By-pass pressure:
When the gun "J" closes, the pressure inside the by-pass housing equalizes and the by-pass
piston "B" is pressed down by the tension of it's spring. The seat "E" in the top of by-pass piston
opens. The water runs from the pump outlet "A" into the by-pass housing "C". Due to the closed
gun "J" and the opening in the by-pass seat "E", the water runs back into the suction side of the
pump through the valve "D".
NEPTUNE PE-DE_en_Ver.1.0_October 2010
Function
By-Pass valve function NEPTUNE 5-46PE and 5-54PE
E
D
C
B
A
F
E
D
C
B
A
By-pass pressure
Jetwash Direct ltd
F
G
H
I
J
G
H
J
I
D
K
K
31