HygroMatik CU-1, Manual

Page: 13 / 56

Page 13
4.3 Vacuum Nozzle Type VN
All water-bearing parts of the vacuum nozzle Type VN are made
of stainless steel.
The pilot valve supplies the nozzles with atomisation air. The
vacuum valve feeds the nozzles with water. The control unit con-
trols both valves via a control air line.
4.3.1 Vacuum Nozzle
The atomisation air (13) flows through the nozzle through a duct
(5) and exits into the outlet (1) between the nozzle cap (2) and
the atomiser tip (3). Following the injector principle, a low pres-
sure differential is created in the nozzle tip (3); suction then
draws water from the water installation (12) through the vacuum
valve. This design ensures that the mixture of atomisation air
and water first occurs outside of the outlet (1). When the flow of
atomisation air is interrupted (pause in operation/cleaning cycle),
the spring (9) drives forward the piston (8) holding the cleaning
needle (11). This operation propels the cleaning needle (11)
through the water outlet (1) and detaches any deposits that may
be present.
After atomisation air returns, the piston (8) is driven backwards
by atomisation air pressure. The cleaning needle (11) retracts
from the nozzle tip (3).
Loc. Designation
1 outlets
2 nozzle cap, front
3 nozzle tip
4 o-ring, front and back
5 atomisation air duct
6 seal ring
7 piston lining
8 piston
9 spring
10 nozzle cap, back
11 cleaning needle
12 water installation
13 atomisation air connection
14 vent hole