24
DRT7115
E - 2022/11
Member of EXEL group
Hollow cone round spray:
Note: The hollow cone only gives good results at high product pressures; we do not recommend
working below 140 bar. The best results are obtained between 160 and 200 bar.
Note: The spraying air pressure must be set between 2 and 3 bars (4 for the K70 gauge); below this,
the spraying becomes less precise and above the jet becomes more dynamic and the hollow cone's
benefits are reduced.
3.2.2.
Version with whip (HR-MR)
Flow limitation
:
The use of a whip limits the max flow available on the gun.
In the case of small gauges (up to 09 included) and for low viscosities (up to 40 sec CA4) the flow loss is
around 15%. For larger gauges (12 and above) and for higher viscosities (above 40 sec and up to 80 sec), the
flow loss is around 20% to 25%.
Note: for higher viscosities and very long hoses, above certain limits the flow starts to fall suddenly
and becomes almost zero:
Gauge
Flow rate (in cc/min)
Impact diameter at
250 mm
Impact diameter at
250 mm
Dynamic air pressure
120 bar
Spraying air
4 bars
200 bar
Spraying air
4 bars
Dynamic
product pressure
120
140
200
140
200
K20
250
260
330
100
110
K30
320
350
420
110
120
K40
400
440
540
110
120
K50
580
600
780
120
130
K60
900
1000
1200
120
130
K70
900
1000
1200
120
130