VMF
, VMO, VMV · Edition 01.20
EN-3
ing orifice, the VMO is fitted downstream of the control.
VMV, VMO
VMF
➔
Installation position with inlet and outlet flang-
es: VMF, VMV and VMO may be inserted at
any position in the pipework. When used as a
measuring orifice, the length of the inlet and
outlet section of the VMO must be ≥ 5 DN.
VMF, VMV
VMO
≥ 5 DN
≥ 5 DN
➔
The housing must not be in contact with masonry,
minimum clearance 20 mm (0.79").
➔
Sealing material and thread cuttings must not be
allowed to get into the housing.
➔
A filter must be installed upstream of every system.
➔
Ensure that there is sufficient space for installation
and adjustment.
➔
Do not store or install the unit in the open air.
CAUtIon
Incorrect installation
Please observe the following to ensure that the
unit is not damaged during installation and oper-
ation:
– Only secure the device by holding the octagon
on the flange with a suitable spanner. Risk of
external leakage.
1
2
3
➔
Both O-rings or the O-ring and double block seal
must be fitted.
WARnInG
Risk of leakage.
Please note the following:
– If VMF, VMO or VMV has been delivered with
two flanges and is subsequently attached to a
valVario control, a double block seal must be
used instead of the O-ring. The double block
seal must be ordered separately, see accesso-
ries, seal set for sizes 1–3.
4
5
6
7
8
VMV
➔
If the fine-adjusting valve VMV is fitted downstream
of a pressure regulator VAD, VAG or VAV, a differ-
ential pressure orifice with rubber seals
G
must
be inserted at the outlet of the pressure regulator.
G
tIGHtness test
1
To be able to check the tightness, shut off the
downstream pipeline close to the VMF, VMO, VMV.
2
3
4
5
6
7
8
Tightness OK: open the pipeline.
➔
Pipeline leaking: check O-rings. When installing on
a valVario valve or pressure regulator, check the
O-ring and, if fitted, the double block seal.
➔
Unit leaking: dismantle the VMF, VMO or VMV and
return it to the manufacturer.
