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3.3 Packaging
Packaging material is to be disposed of environmentally
friendly.
4 Technical data
4.1 Performance data
Lengths according to DIN EN 558-1, basic series 1:
– Round flanges according to DIN EN 1092-2, PN 16
(item no. 106 46/47 ..)
– Hole circles with flanges according to ANSI 150
(item no. 106 49 ..)
max. operating pressure p
max. differential pressure:
max. operating temperature t
min. operating temperature t
Length of capillary:
Fluid: Non-aggressive fluids (e.g. water and suitable water
and glycol mixtures according to VDI 2035). Not suitable
for steam, oily and aggressive fluids.
DANGER
Suitable measures (e.g. safety valves) have to be taken
to ensure that the maximum operating pressures and
maximum and minimum operating temperatures are
not exceeded or undercut.
4.2 Materials
Valve body made of cast iron (GG 25 / EN-GJL-250 ac-
cording to DIN EN 1561), bonnet made of bronze, stem
made of dezincification resistant brass, seat and disc
made on stainless steel with EPDM seal. Maintenance-
free stem seal due to double EPDM O-ring.
4.3 Weights and k
values
vs
Item no.
DN
200 up to 1000 mbar 400 up to 1800 mbar
10647/4951
65
1064651
10647/4952
80
1064652
10647/4953
100
1064653
10647/4954
125
1064654
10647/4955
150
1064655
200
5 Construction and function
5.1 Summary and functional description
The Oventrop differential pressure regulators "Hydromat
DFC" are proportional regulators working without auxiliary
energy and are designed to maintain a constant differential
pressure within a necessary proportional band. With the
differential pressure in the installation increasing, the valve
disc closes down and opens as the differential pressure
falls. The excess differential pressure is reduced by the
differential pressure regulator, until the set differential pres-
sure in the pipe is reached.
5.2 Markings
– CE marking on the handwheel:
CE marking
– Information on the regulator body:
OV
Oventrop
DN
Nominal size
6
:
16 bar (PN 16)
s
5 bar (500 kPa)
: 120 °C
s
: -10 °C
s
1 m
Weight
k
vs
approx. [kg]
52
31
1664751
75
36
1664752
110
46
1664753
145
61
1664754
170
70
1664755
1064756
420
160
PN
Nominal pressure
GJL250 / GG25
Regulator body material
6 Installation
The differential pressure regulators are installed in the re-
turn pipe (see illustr. 6.1).
Installation is possible in any position provided the di-
rection of flow conforms to the direction of the arrow on
the regulator body. Before installing the regulator into the
pipework, the latter has to be flushed thoroughly. The in-
stallation of an Oventrop "Y" type strainer is recommen-
ded. The capillary should be fitted above or horizontal to
the supply pipe, but not from underneath where it might
be prone to get blocked by dirt particles.
The enclosed isolating ball valve is to be installed with an
appropriate sealant into a G ¼ threaded connection, then
the capillary can be connected.
Supply
1
G
⁄
4
Return
"Hydromat DFC"
Illustr. 6.1 "Hydromat DFC", installation in the return pipe
After installation, the handwheel and the measuring con-
nection should be easily accessible.
For cooling systems: Please provide frost protection and
diffusion tight insulation
Observe warning advice under paragraph 2 (safety
notes)
CAUTION
– Pressurise the system only after the capillaries have
been connected and the ball valves are in the open po-
sition (max. test pressure 1.5 x PN). The increase of the
pressure must be made equally at the
ons. At no time may the
+
pressure If this rule is not observed, the regulator
might be damaged
– Do not use any greasing agents or oils for the installation,
as these can destroy the valve seals. Any dirt particles
or grease or oil residues must be flushed out before the
regulator is installed.
– When choosing the operating fluid, the latest technical
development has to be considered (e.g. VDI 2035).
– Please protect against external forces (e.g. impacts, vi-
brations etc.).
Capillary
laid in the
factory
+
-
/
connecti-
-
pressure be higher than the
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