Operationh; Description Of The Device; Automatic Adjustment Of The Dosing Flow; Switching From Automatic To Manual Adjustment Of The Dosing Flow; Only With Option Servomotor - Grundfos VGA-113-110 Instrucciones De Instalación Y Operación

6. Operationh

6.1 Description of the device

5
1
2
3
4
Fig. 24 Dosing regulator with servomotor and manual dosing
regulator
Item Component
1 Rate valve
2 Measuring tube
Connection for the
3 vacuum line from the
vacuum regulator
Connection for the
4 vacuum line to the
injector
optional:
Differential pressure
regulator (not visible)
Only for VGA-113
5
with servomotor
The rate valve is not a perfectly closing shut-off
Caution
valve!

6.2 Automatic adjustment of the dosing flow

Only with option servomotor!
In case of automatic adjustment of the dosing flow,
Note no adjustment can be made at the dosing unit. All
adjustment has to be made at the control device.
Observe the manual of the control device!
18
1
2
3
4
Description
For manual adjustment of the
desired gas flow.
It displays the actual gas flow.
For the injection point
For the injection point
It keeps the difference of the
pressures before and after the
rate valve on a constant value.
The adjusted dosing flow stays
constant even when the injector
vacuum varies.
For automatic adjustment of the
desired gas flow.
6.2.1 Switching from automatic to manual adjustment of the
dosing flow; only with option servomotor
• Switch off automatic control.
• Push the coupling (1) upwards.
• Move the retention pin (2) through the coupling, until it cannot
move down any longer.
• Now the dosing flow can be adjusted by hand.
--> The servomotor is disconnected from the rate valve.
1
Fig. 25 Disconnect to servomotor

6.2.2 Switching from manual to automatic adjustment of the

dosing flow; only with option servomotor
• Move back the retention pin (2).
– Now the coupling (1) falls down.
• Turn the adjustment knob (3), until the coupling snaps in.
--> Now the servomotor is connected to the rate valve.
2
Fig. 26 Conect to servomotor

6.3 Adjusting the Dosing Flow

6.3.1 Increasing the dosing flow

1
Fig. 27 Increasing the dosing flow
• Turn the adjustment knob of the rate valve slowly to the right.
Do not screw out the adjustment knob. Do not
Caution
continue turning the knob when maximum dosing
flow is reached.
2
3