Publicité
Les langues disponibles
Les langues disponibles
4.2 Dimensions
Black
ring
50
143
Illustr. 3 Straight pattern
50
143
Illustr. 4 Angle pattern, left hand side connection
5 Function
5.1 Functional description
The fitting is a combination consisting of a presettable
flow regulator (valve insert "QA") and an isolating fitting
(valve insert "Combi LR").
The flow regulator maintains the differential pressure
at a constant level via the presetting and regulating
cross-section of the fitting. Even where high differential
pressure variations occur, for instance if sections of
the system are activated or inactivated, the flow rate
is kept at a constant level within the regulation
tolerances.
The maximum flow rate can be set with the help of the
presetting key (pos. 4, illustr. 5) (see paragraph 6.2.1).
The fitting can also be used for room temperature
control if the room temperature shall not be controlled
by the valve insert integrated in the radiator. Thermostats
and actuators with OV connection thread M 30 x 1.5
can be screwed onto the flow regulator for this purpose.
See Oventrop catalogue "Products".
The fitting is used at radiators with female thread G
or male thread G
⁄
according to DIN EN 16313 (cone
3
4
"Euro") and a distance of 50 mm between the pipe
centres.
The connections of the fitting "Multiflex FQ" with
"Q-Tech" to the radiators are soft sealed.
The fittings for radiators with female thread G
G
⁄
male thread are supplied with self-sealing nipples
3
4
or inserts.
The pipework is connected to the male threads G
according to DIN EN 16313 (cone "Euro") by use of
compression fittings.
8
G
⁄
3
4
G
⁄
3
4
G
⁄
3
4
Black
ring
24
⁄
1
2
⁄
or
1
2
⁄
3
4
5.2 Construction
2a
2
3
5
1
4
Illustr. 5 Construction flow regulator
5.3 Differential pressure measurement
The available differential pressure can be measured
with the help of the OV measuring systems (e.g. "OV-
DMC 3", "OV-DMC 2" or "OV-DMPC") together with
the "Demo-Bloc" (item no. 1188051) and the differential
pressure measuring stem (item no. 1188093). This will
confirm if the differential pressure is high enough for
an automatic flow control of the "Multiflex FQ" fitting.
The pump setting may also be optimised by measuring
the differential pressure.
For this purpose, the pump head is reduced until just
the minimum required differential pressure is available
at the hydraulically most underprivileged valves.
With a flow meter connected, the differential pressure
at the valve body is measured. To do so, the cap (pos.
3, illustr. 5) has to be unscrewed first. Then the valve
insert (pos. 2, illustr. 5) is unscrewed with the help of
the "Demo-Bloc" and the differential pressure is
measured using the differential pressure measuring
stem. As soon as the measured differential pressure
has reached or exceeded the differential pressure Δp
min. (see 4.1), the differential pressure is high enough
for an automatic flow control of the fitting.
Screw the valve insert into the body again, fit the cap
and check all installation points for leaks.
NOTICE
The valve insert is tightened with a torque of 15 Nm.
Use a 19 mm spanner for mounting and dismounting
the valve insert.
∆p
1 Body
2 Valve insert
2a Handwheel
3 Cap (3-part)
4 Presetting key
5 Black ring
(marking of supply side)
∆p Differential pressure
Publicité
