Buhnen HB 5010, Translation Of The Original Operating Manual

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Set-up / Retrofit
34
7.2 Setting the pump pressure
Required tools • Socket wrench size 8 or
• offset box wrench size 8 depth gauge
• (metal) measuring stick
Danger of burns!
The bypass valve used to set the pump pressure can reach temperatures of more than
200 °C.
Therefore, always wear heat protection gloves during the following work steps.
Figure 7.2/1: Setting the pump pressure
Info
The pump pressure strongly depends on the temperature and the viscosity of the hot
melt adhesive used. The procedure described in the following therefore only serves as an
approximate setting of the pump pressure.
A pressure measuring device will be needed to make an accurate setting.
Figure 7.2/2 provides you with an orientation for hot melt adhesive with a processing tem-
perature of 180°C at a viscosity of approx. 1,000 Pas. In this case, the standard setting of
the device of approx. 35 bar also applies.
To set the pump pressure, carry out the following work steps:
1. If not already done so, bring up the tank system to the operating temperature re-
quired for the utilized hot melt adhesive.
2. The visible thread length “L” of the adjusting screw is the measure for the pump pres-
sure. Refer to the following diagram for the required length “L.”