oventrop Cocon QFC Instrucciones De Instalación Y Operación Para El Instalador Especializado página 3

Illus. 2 Setting sleeve (must be unscrewed before modification
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 a locking
clip.
If the valve is operated without actuator, the required
presetting can be fixed with the setting sleeve. The pressure
independent control valve "Cocon QFC/QGC" now operates
as flow regulator. The setting sleeve has to be hand tightened
until stop for this purpose.
Illus. 3 Example settings
When mounting an actuator, the corresponding installation
instructions must be observed
The flow-meter "OV-DMC 2" can be connected to the
pressure 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
hydraulically underprivileged valves are just working within
the control range.
Setting sleeve
Presetting
Handwheel
7 GPM+ 0 GPM = 7 GPM
Locking clip in
open position
7 GPM+ 3.5 GPM = 10.5 GPM
Locking clip in
locking position
Illus. 4 Differential pressure
With a flow-meter connected (e.g. OV-DMC2) the differential
pressure is measured across the valve.
The illustrated section of the "Cocon QFC/QGC" valve (illus. 5)
shows three pressure ranges. "p1" is the inlet and "p3" the
outlet 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 pressure
independent control 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
Illus. 5 Construction of the "Cocon QFC/QGC" valve
Illus. 6 Function principle of the "Cocon QFC/QGC" valve
3