vonRoll hydro VARIO 2.0 Montageanleitung Seite 30

Optional manoeuvres
Activating/deactivating the dual shut-off
on a conically sealing main valve
1. With the main valve closed,
remove the upper section
2. Remove the spacer sleeve, then
refit the upper section
3. Fully open the main valve,
then remove the upper section
4. Pull out the main valve;
the dual shut-off is now active