Initial Operation
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
6.4 Valves with Air cooling
If you want to air cool your valve with compressed air, you have to connect the air hoses after
finishing the cable connections of the valve. Use 4 mm hoses.
Fig. 34: Valve with air cooling connected
One end of the hose has to be pushed onto the air inlet of the valve (in); the other one is
connected to the air supply.
The second connector (out) represents the outlet, evacuating the heated compressed air from
the valve. You can extend this connection with an air hose. Push one end of the air hose onto the
adapter. When running the hose to the air supply, take care not to impair functions of the system,
or to disturb operators during their work.
For air cooling you should use a compressed-air pressure of about 2 bar. For a hot melt
application or other high temperature applications, you should set the pressure higher, at up to
4 bar.
Quality of compressed air
Quality of compressed air should comply with DIN ISO 8573-1.
The pneumatic supply used for cooling of the valve should be free of fine dust and condensate,
and correspond to classes 1, 4, 2 according to DIN/ISO 8573-1.
• Solid particles: Quality class 1
max. number of particles/m³: 0.1 – 0.5 µm: < 20000, 0.5 – 1 µm: < 400, 1 – 5 µm: < 10
• Water content: Quality class 4
max. pressure dew point +3 °C
• Residual oil: Quality class 2
0.1 mg/m³ max.
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