ARI Armaturen PRESO EN - Manual (Page 8)

Page 8 Rev. 0040402000 0410
Operating and installation instructions
PRESO
®
Start-up then takes place as follows:
- Carefully open stop valves upstream and downstream of surplus valve.
- Dismantle cap (see point 6.1.1).
- Adjust tensioning screw (see point 6.1.2) until the desired differential pressure
ΔP
is reached.
6.1 Setting instructions
Fig. 3
e.g. Setting at 2 bar
Back pressure 0.5 bar
ΔP = 1.5 bar
The surplus valve generally removes the required amount of flow, with a
corresponding pressure increase by way of the set pressure.
The statement of Kv value on the type identification plate corresponds to
ΔP + 50% pressure increase.
e.g. ΔP at setting x 1.5 ΔP + 50% = 2.25 bar ΔP
Stem (assembly aid)