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Illustr. 2 Setting sleeve (must be unscrewed before modificati-
on of the presetting)
The setting sleeve must be unscrewed before modification of
the flow value.
Presetting is limited to the maximum possible flow volume. The
presetting and the maximum flow volume are determined by
turning the handwheel.
The presetting can be secured and lead locked with the help of
the locking clip.
If the valve is operated without actuator, the required preset-
ting can be fixed with the setting sleeve. The combined control
and regulating valve "Cocon QTR" now operates as flow regu-
lator. The setting sleeve has to be hand tightened until stop for
this purpose.
Illustr. 3 Example settings
When mounting an actuator, the corresponding installation in-
structions must be observed
The flow-meter "OV-DMC 2" can be connected to the pressu-
re test points. This will determine if the valve is working within
the control range. The pump setting can be optimised by
measuring the differential pressure.
For this purpose, the pump head is reduced until the hydrau-
lically underprivileged valves are just working within the con-
trol range.
8
Setting sleeve
Presetting
Handwheel
6 m
3
/h + 0 m
3
/h = 6 m
3
/h
Locking clip in
open position
6 m
3
/h + 1.3 m
3
/h = 7.3 m
3
/h
Locking clip in
locking position
Illustr. 4 Differential pressure
With a flow-meter (e.g. "OV-DMC 2") connected, the differen-
tial pressure is measured across the valve.
The illustrated section of the "Cocon QTR" valve (illustr. 5)
shows three pressure ranges. "p1" is the inlet and "p3" the out-
let pressure of the valve. "p2" is the working pressure actuating
the diaphragm unit.
The differential pressure "p1" - "p2" is maintained at a constant
level by the integrated diaphragm unit (pos. 1a) of the combi-
ned control and regulating valve.
Legend:
1 Flow control unit
1a Diaphragm unit
1b Nominal value unit
2 Regulating unit
3 Handwheel
4 Diaphragm
5 Regulating sleeve
6 Setting sleeve
Illustr. 5 Construction of the "Cocon QTR" valve
Illustr. 6 Function principle of the "Cocon QTR" valve
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