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After installation, check all installation points for leaks.
7 Operation
7.1 Deaeration of the installation
Before putting the system into operation, the upper and
lower diaphragm chamber must be de-aerated. To do so,
loosen the venting screws with a 4 mm spanner and tighten
again after this process.
7.2 Correction factors for mixtures of water and gly-
col
The correction factors of the manufacturer of the antifreeze
liquids have to be considered when setting the flow rate.
7.3 Presetting
The nominal value of the Oventrop differential pressure re-
gulator is infinitely adjustable between 200 and 1000 mbar
or 400 and 1800 mbar.
The required value is set by turning the handwheel.
a) The display of the basic setting is shown by the longi-
tudinal scale together with the sliding indicator. Each
turn of the handwheel is represented by a line on the
longitudinal scale.
b) The display of the fine setting is shown by the peri-
pheral scale on the handwheel together with the mar-
king. The subdivisions of the peripheral scale corres-
pond to 1/10th of a turn of the handhweel.
Sliding
indicator
Fine setting scale
(piripheral scale)
Marking
Basic setting scale
(longitudinal scale)
Illustr. 7.1 Presetting
7.4 Operation of the manual isolation
The differential pressure regulator can be closed off ma-
nually, e.g. for maintenance works and thus additionally
acts as an isolating valve.
Close off as follows:
1.
Close both isolating ball valves for the capillaries of
the lower and upper diaphragm chamber. It can
cause damage if this is not adhered to
2.
Turn the handwheel as far as it will go (scale will dis-
play closed position).
Now the system can be drained off. The pressure in the
direction of flow, in front of the differential pressure regu-
lator must be equal or higher than the pressure behind
the differential pressure regulator.
Handwheel
Cover plug
Screw
Hole for
sealing wire
Hole for
sealing wire
Open as follows:
1.
Set the required nominal value by turning the handw-
heel.
2.
Once the system has been filled, both isolating ball
valves for the capillaries of the lower and upper dia-
phragm chamber must be opened.
7.5 Readability of the setting scales
Depending on the installation position of the differential
pressure regulator, an improvement of the readability of
the setting scales is obtained by turning the scale. To do
so, remove cover plug, undo screw and, with a light tug,
pull the handwheel off the valve stem
Next, without altering the setting, adjust the position of
the handwheel so that the indicator window of the peri-
pheral scale is clearly visible. Finally, refit the handwheel
to the valve stem, tighten the screw and replace the cover
plug.
7.6 Locking the handwheel
Clip
Guide
Illustr. 7.2 Locking the handwheel
The nominal value can be locked in any position (1/10th
of a turn). To do so, push the enclosed clip into the cut-
out in the handwheel below the holes between the guides
until stop (see illustr. 7.2). The clip can now be sealed as
illustrated. It is essential that the sealing wire is fitted
tightly.
8 Accessories
Oventrop offers two measuring gauges for presetting and
regulation of the flow rate:
– Oventrop measuring system "OV-DMC 2"
– Oventrop measuring system "OV-DMPC"
The accessories can be found in the catalogue.
9 Maintenance
The differential pressure regulator is maintenance-free.
Tightness and function of the regulator and its connection
points have to be checked regularly during maintenance.
The regulator must be easily accessible.
10 Warranty
Oventrops warranty conditions valid at the time of supply
are applicable.
Lead seal
7
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