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TECHNICAL INFORMATION
Pre-setting manual balancing valves
CIM 788
Description
Cim 788 balancing valves are suitable for
both heating (LPWH) and cooling
applications, ensuring high accuracy flow
balancing across all valve settings.
tutto il campo di regolazione della valvola.
Cim 788 pre-setting balancing valve is
made of ADZ brass material with female-
female threads according to ISO 7 and it is
suitable for both heating and coolingapplications at working pressures up to 25
bar, within the temperature range of -
10C and +120C.
The main features ofCIM 788pre-setting balancing valve are as follows:
Screw driver adjustable pre-setting.
11 positions flow pre-setting.
Plastic cap enabling the valve to be closed and opened at pre-set Kv value.
An EPDM lined valve plug providing tight shut-off for isolation purposes..
Designed to be upgraded with thermoelectric actuator (Cim 788NC, Cim 788NO, Cim 788NC24, Cim
788NO24, Cim 788PRO).
Fig 1
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Installation procedure
Before installation ofCIM 788, check that inside the valve and the pipes there are no foreign matters which
might damage the tightness of the valve.
When installing the valve, please make sure to have a pipe length 5 times the DN upstream the valve and 2
times the DN downstream, and pay attention to the arrow direction casted on the valve body, which shall be
the same as the flow one. The valve can be installed in any position if fluid is clean; if this is not the case,
avoid upside down installation.
Burr pipe connections after having threaded them and distribute the sealing material on pipe threads only
and not on valve threads. The sealing material quantity shall be according to the dimension of parts to be
coupled. An excessive quantity of sealing material could submit the threaded ends to extreme stress and/or
fall inside the valve and cause problem to the flow.
For assembly purposes, use a spanner, not a pipe wrench, by applying necessary working torque only on
the valve end nearest 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.
Regulating
Remove the blue plastic cap of the upper part of the bonnet to pre-set the flow rate. Looking at the data
shown in the herewith attached diagrams, regulate the flow by rotating the hexagonal stem-ring with a
screwdriver inserted in the relevant slot. When regulating is carried out, the slot position will show the
opening grade of the obturator. The index scale shows 11 values going from the minimum flow rate (0) tothe maximum one (10). The reading of this flow rate can be done by using the differential manometer Cim
726. This interfaces with the balancing valve through two sensors placed at the ends of the valve. To protect
the bonnet, replace the cap and leave it unloosed to enable the water flow. On the other hand, if the
interception of the fluid is required, tight the cap firmly and completely.
Fig 2
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Fig 3
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,
make sure that the installation is not under service
or pressure.
Should you need to replace the tightening OR (13)
between body (1) and bonnet (2), follow the
instructions given here below:
Remove the blue cap (19);
Take note of the pre-setting position on a
sheet of paper;
Unscrew the bonnet (2) with a key, acting onthe hexagonal side;
Replace the Oring (19);
Screw the bonnet (2) again until the
complete tightening on the valve body (1),
acting on the hexagonal side;
Make sure that the index scale (14) has not been rotated during bonnet removal. To this purpose,
rotate clockwise the hexagonal stem-ring (4) with a screwdriver until the stop. In this position the slot
of the stem-ring shall be aligned with the 0 value of the index scale (14). If not, remove the index
scale (14) with the screwdriver and replace it aligned as described above.
Place the stem-ring (4) as made during the previous regulation;
Replace the blue cap (19) and leave it unloosed to enable the water flow.
The following table shows the dimensions of the full range of valve CIM 788. The data D means the length
of the body threads.
DN A B C D F
106 58 77 16 35
107 60 80 19 35
1 107 62 87 21 35
Fig 4
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Spare parts
Cim 788 pre-setting balancing valve are designed to be upgraded with different type of thermoelectric
actuators to open and close the valve on heating circuit distributors on floor heating systems. The actuator is
able to keep the valve closed until a maximum differential pressure of 2,2 bar. The following versions are
available:
Cim 788NC normally closed 230V-50/60Hz(actuator only Cim EMV 310/NC230)
Cim 788NO normally open 230V-50/60Hz(actuator only Cim EMV 310/NO230)
Cim 788NC24 normally closed 24V-50/60Hz(actuator only Cim EMV 310/NC24)
Cim 788NO24 normally open 24V-50/60Hz(actuator only Cim EMV 310/NO24)
The thermoelectric actuator assembling on the valve is made with a
plastic adaptor, screwed on the bonnet, that enables the actuatorassembling by snap-on device. The technical features of these
thermoelectric actuators are the following:
Operating power: 1,8 WDegree/Class of protection: IP54/II (in all installationpositions)Actuator stroke: 4,5 mmActuating force: 100 N 5%Connecting cable: 2x0,75 mm
2PVC grey
Cable length: 1000 mmConnection: valve adapter VA80 (NC)
Valve adapter VA50 (NO)
Cim 788PRO (actuator only Cim EMV 310/PRO24) is the version with thermoelectric actuator normally
closed with internal electronic unit for proportional control of valves used in building management systems.
The technical features of proportional thermoelectric actuators are the following:
Operating voltage: 24 V, -10% fino a +20%, 50/60HzControl vol tage: 0-10 V DCInput resistance: 100 kOhmOperating power: 1,8 WDegree of p rotection: IP54Actuator stroke: 4,5 mmActuating force: 100 N 5%Activation current max:
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Diagrams and tables
CIM 788 1/2 DN 15
Kvs value registered on the binder points placed at the ends of the valve
Kvs (flow rate in m3/h @ 1bar pressure drop)
Pre-setting position
0 1 2 3 4 5 6 7 8 9 10
0,26 0,32 0,46 0,70 0,97 1,23 1,44 1,58 1,65 1,68 1,70
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CIM 788 3/4 DN 20
Kvs value registered on the binder points placed at the ends of the valve
Kvs (flow rate in m3/h @ 1bar pressure drop)
Pre-setting position
0 1 2 3 4 5 6 7 8 9 10
0,26 0,32 0,46 0,70 1,01 1,42 1,80 2,17 2,48 2,71 2,90
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CIM 788 1 DN 25
Kvs value registered on the binder points placed at the ends of the valve
Kvs (flow rate in m3/h @ 1bar pressure drop)
Pre-setting position
0 1 2 3 4 5 6 7 8 9 10
0,26 0,35 0,50 0,73 1,06 1,51 1,94 2,39 2,82 3,13 3,50
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