Download - Technical Leaflet Cim 767
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Technical Leaflet Cim 767Revision 0
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TECHNICAL INFORMATION
Differential pressure control valve
CIM 767
Description
Cim 767 are designed for automatic control
of differential pressure (DPCV) in order to
maintain constant differential pressure
between two points of the installation. The
flow rate of each branch of a circuit may
change according to temperature
requirements. Since flow rates depend on
p, the main feature of Cim 767 is to
maintain constant the nominal flow rate
through open terminal units, regardless
partial or full closing of them. Cim 767 is
suitable for heating and cooling installations,
assuring a good modulating control and
reducing the noise risks coming from two-ways control valves, when high p values might be present in the
installation. Cim 767 is normally coupled with a partner balancing valve placed on feed line, enabling the
flow regulation.
Cim 767differential pressure control valve is made of CR Corrosion Resistant brass with female-female
threads according to ISO 228 standard and it is suitable for working pressure up to 16 bar, within the working
temperature range of -10C and +120C.
They are manufactured in sizes from DN 15 up to DN 50 and work properly up to a maximum differential
pressure of 400 KPa. The maximum flow rate is 15 m3/h.
Picture 1
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The main features of Cim 767are as follows:
Keeping of selected p at the ends of the circuit, by operating on screw of the handle of the valve with
Allen key.
Differential pressure control at the ends of the valve, using a p measuring instrument connected tobinder points.
Noise clearance when installation is in overpressure conditions.
Reduction of balancing costs, improved energy saving and high environmental comfort.
Easy flushing procedure thanks to quick and simple removal of differential pressure control cartridge,
placed inside valve body.
Reduced installation dimensions thanks to compact valve construction, which does not require inlet and
outlet straight pipelines to stabilize the flow.
Installation
Before installation ofCim 767, check that inside the valve and the pipes there are no foreign matters which
might damage the tightness of the valve.
Burr pipe connections after having threaded them and distribute the sealing material on pipe threads only
and not on valve threads.
Make sure that required flow rate is within operating range of the valve. Cim 767 shall be installed on the
return line either on horizontal or vertical position, but following the arrow direction casted on valve body,
which shall be the same as the flow one. Cim 767 is coupled with partner valve Cim 787DP, installed on
feed line by a copper capillary pipe.
For assembly purpose, use a spanner, not a pipe
wrench, by applying necessary working torque
only on the valve end nearest to the pipe. This
helps get a firmer grip and avoids potential
damages to valve body. Make sure that pipe
threading length is not longer than valve threads.
After DPC cartridge removal, it is possible to flush
the system branch where the valve is installed;
when flushing process is over, reposition the DPC
control cartridge.
Cim 787DP
Cim 767
Picture 2
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Valve regulation
p regulation ofCim 767 valve (see picture 3) is carried out by Allen key in 4 mm.
The relation between flow rate, p of feed line and return line and screwing turns of regulating Allen screw
are given by the tables stated on following pages (see Graphs and Tables).
p increase and decrease is reached by turning clockwise or anticlockwise Allen screw respectively (see
picture 3).
During regulation of differential pressure, the valve
shall be set to minimum value to proceed with turns
numbering; after that, the valve shall be regulated
according to tables.
p of the system is measured through differential
manometer Cim 726 with the two sensors, red and
blue, which are inserted in binder points PF- and P+
respectively (see picture 4).
Flow rate of the system is regulated through a
partner balancing valve Cim 787DP, by
measuring the difference in pressure between
points PF+ and PF- and referring to the graphs
ofCim 787 valve.
Flow rate drop ofCim 767 valve under service
is shown when the two sensors of measuring
device are inserted in the binder points of the
said valve.
Maintenance
As a rule, the balancing valve does not need
any maintenance. In case of replacement or need of disassembling of some components of the valve, f.i. for
flushing the cartridge of differential pressure, make sure that the installation is not under service or pressure.
Picture 3
Picture 4
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The following table shows the dimensions of full range of valves Cim 767.
DN A B C CH
1/2 55 79 95,5 27
3/4 55 79 96,5 32
1 75 91 132 39
11/4 75 91 132 47
11/2 87 97 144,5 54
2 90 106 155 68
Picture 5
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Graphs and Tables
CIM 767 - 1/2 DN 15 Lowp = 530 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATEControl p range
(KPa)l/h l/s gpm*
Kvs
5 30 50 600 0,014 0,167 0,22 2,65 3,6
* The gpm values are corresponding to US gallon per minute.
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CIM 767 3/4 DN 20 Lowp = 530 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATE
Control p range(KPa)
l/h l/s gpm*
Kvs
5 30 100 1000 0,028 0,278 0,44 4,41 4,0
* The gpm values are corresponding to US gallon per minute.
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CIM 767 1 DN 25 Lowp = 530 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATEControl p range
(KPa)l/h l/s gpm*
Kvs
5 30 600 2500 0,167 0,694 2,65 11,02 9,5
* The gpm values are corresponding to US gallon per minute.
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CIM 767 1/2 DN 15 High p = 2060 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATEControl p range
(KPa) l/h l/s gpm*
Kvs
20 60 100 1200 0,028 0,333 0,44 5,29 3,6
* The gpm values are corresponding to US gallon per minute.
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CIM 767 3/4 DN 20 High p = 2060 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATEControl p range
(KPa) l/h l/s gpm*
Kvs
20 60 150 2000 0,042 0,556 0,66 8,82 4,0
* The gpm values are corresponding to US gallon per minute.
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CIM 767 1 DN 25 High p = 2060 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATEControl p range
(KPa) l/h l/s gpm*
Kvs
20 60 700 4200 0,194 1,167 3,09 18,52 9,5
* The gpm values are corresponding to US gallon per minute.
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CIM 767 11/4 DN 32 High p = 2080 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATEControl p range
(KPa) l/h l/s gpm*
Kvs
20 80 1000 5000 0,278 1,389 4,41 22,05 11,4
* The gpm values are corresponding to US gallon per minute.
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CIM 767 11/2 DN 40 High p = 2080 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATEControl p range
(KPa) l/h l/s gpm*
Kvs
20 80 3000 8000 0,833 2,222 13,23 35,27 16,4
* The gpm values are corresponding to US gallon per minute.
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CIM 767 2 DN 50 High p = 2080 KPa
p differential pressure according to number of turns of Allen screw
FLOW RATEControl p range
(KPa) l/h l/s gpm*
Kvs
20 80 5000 15000 1,389 4,167 22,05 66,14 17,9
* The gpm values are corresponding to US gallon per minute.