technical leaflet cim 3723b

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Technical leaflet Cim 3723BRevisione 0

Emissione 03/2011

TECHNICAL INFORMATION

Flow measurement device

CIM 3723B

Description

Cim 3723B is a flow measurement device, wafer

type, with fixed orifice, assuring high accuracy

in differential pressure and relevant flow rate

measurement.

Cim 3723B is made of stainless steel AISI 304

with dimensions suitable for its installation

between flanges according to BS EN 1092.

Cim 3723B is suitable for heating and cooling

installation, with working pressure up to 16 bar,within the working temperature range -10C up to

+120C.

The main features ofCim 3723B are the following:

Possible installation with a balancing valve;

High accuracy flow rate reading, within 5% of nominal value, regardless of valve setting.

Made according to BS 7350 standard;

Two binder points allowing connection to a differential manometer.

Picture 1


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Installation procedure

Before installation ofCim 3723B, check that inside the valve and the pipes there is no foreign matters which

might damage the tightness of binder points or cause turbulences to the water flow, preventing high

accuracy signal reading.

When installing the flow measurement device, please make sure to have a pipe length 5 times the DN

upstream the valve and pay attention to the arrow direction casted on the valve body, which shall be the

same as the flow one. The valve shall be installed with binder point upstream and blue one downstream.

To regulate flow rate, Cim 3723B can be coupled with a balancing valve; in this case, it shall be screwed on

the inlet screwed end of said valve. IfCim 3723B is installed by itself and not with a regulating valve, make

sure to have downstream a pipe length 2 times the DN.

J oints between valve and flanges shall be perfect and suitable for the working conditions required. During

installation, check that flange and relevant joint are coaxial, to avoid any water bore reduction. Tighten nuts

progressively and in a crossed way (first one nut and secondly the one diametrically opposite), in order to

avoid any bending to flanges.

If installed horizontally, Cim 3723B should have binder points faced up at 45 to avoid any deposit, which

might block holes of binder points. In case of ceiling installation, and consequently with no possibility of such

assembling (lack of enough room for sensors insertion), Cim 3723B can be installed with binder points

downward, but always at 45. If Cim 3723B is installed vertically, all positions are accepted, but always

taking into account the connection to a differential manometer: the insertion of sensors of this manometer

needs at least 100mm of free area along the axe of each binder point.

Binder points are supplied disassembled from the valve. Screw the extensions with a key acting on themilled surfaces; fix binder points at the end of said extension and make sure that binder point with red strap

is assembled upwards. For assembly purposes, use a suitable tightening material.

For high accuracy reading of differential pressure, release possible air inside the installation.

Differential pressure and flow rate reading

Unscrew the plugs of binder points placed on the fixed orifice ends of the valve and insert the sensors of

differential manometer Cim 726, pressing the measuring needles until the perforation of tightening rubber.

The colour of binder point straps means the following:

Red strap: the value registered in this point means the upstream pressure of fixed orifice;

Blue strap: the value registered in this point means the downstream pressure of fixed orifice.

IfCim 726 device is not available, differential pressures and relevant flow rate can be read in the diagrams

reported on following pages (see Graphs and Tables).

When measuring is over, remove measuring needles carefully, for some splash of water might come out.

Replace the plugs of binder points.


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Maintenance

As a rule, the flow measurement device Cim 3723B 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.

The following table shows the dimensions of the full range ofCim 3723B.

Legenda:

1. Valve body;

2. Extension;

3. Binder point.

DN 50 65 80 100 125 150 200 250 300

A 20 20 20 20 20 20 20 20 20

B 108 125 144 164 194 220 275 333 385

C 136 145 154 164 179 192 219 248 304

Fig 2

1

2

3


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Graphs and tables

CIM 3723B DN 50

Kvs value registered on the binder points placed at the ends of f ixed orifice

Kvs (flow rate in m3/h @ 1bar pressure drop signal)

Size Kvs

DN 50 47,5


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CIM 3723B - DN 65



Size Kvs

DN 65 88,5


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CIM 3723B - DN 80



Size Kvs

DN 80 150,6


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CIM 3723B DN 100



Size Kvs

DN 100 281,1


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CIM 3723B DN 125



Size Kvs

DN 125 328,8


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CIM 3723B DN 150



Size Kvs

DN 150 477,5


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CIM 3723B DN 200



Size Kvs

DN 200 826,0


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CIM 3723B DN 250



Size Kvs

DN 250 1218,0


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CIM 3723B DN 300



Size Kvs

DN 300 1794,0

technical leaflet cim 3723b

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