Design And Function; Description Of The Device; Pressure Gauge; Functional Principle - Grundfos Vaccuperm VGA-111 Installations- Und Bedienungsanleitungen

4. Design and function

4.1 Description of the device

2
Fig. 9 Vacuum regulator with liquid trap
Pos. Description
Inlet valve with pressure connection for connecting the
1
VGA-111 vacuum regulator to the chlorine container
2 Empty indication: red mark
3 Connection for the vacuum line (to the dosing regulator)
Connection for the overpressure line (to the adsorption
4
filter)
5 Pressure gauge (option)
6 Liquid trap (option)
4.1.1 Empty indication
The red mark (6) on the vacuum regulator is the empty indication.
It indicates that the residual pressure in the chlorine container is
too low, or the chlorine container valve is closed. When the
chlorine quantity is sufficient, the green mark is visible.
The empty indication works only when the regulator
Note
is in operation.
When the container is emptied, a residual pressure of approx.
2 bar remains. The container is not completely evacuated.
Corrosion and soiling due to the penetration of humidity in the
event of container exchange is thus prevented.

4.1.2 Pressure gauge

The pressure gauge indicates the gas pressure at the inlet valve
(admission pressure). The pressure gauge is optionally available
with limit contact for setting a minimum admission pressure, e.g.
for monitoring from a control room.
4.1.3 Liquid trap
The liquid trap prevents liquefied gas from penetrating the
vacuum regulator. The temperature is automatically adjusted to
approx. 60 °C.
12
5
1
2
3
4
6

4.2 Functional principle

4.2.1 Vacuum regulator
The vacuum regulator is a pressure reducing valve, which
reduces the overpressure from the chlorine tank side to the
negative pressure on the vacuum side. The valve at the vacuum
regulator opens, when after switching on the injector a sufficient
vacuum has built up at the outlet side.
The regulator is passive.
Note
Regulation of the dosing quantity has to be made at
other components of the system.
The vacuum regulator includes the following safety components.
• Safety relief valve: If the gas inlet valve of the regulator is
soiled, the safety relief valve opens. The gas escapes through
the overpressure line into the adsorption filter. If the filter is
full, the gas sensor triggers an alarm.
• If the vacuum on the negative pressure side collapses, the
valve in the regulator closes, and the chlorine gas flow is
stopped.
• Liquid trap (option): A liquid trap can be installed upstream in
order to prevent liquid chlorine from penetrating the regulator.