Iris regulating damper - tecno

2-1.0-02.00-E-03/07
SIR - Iris regulating damper
components for air-conditioning systems
Iris damper
SIR
SIR Iris regulating damper
Ve r s i o n s
- SIR (regulating damper in steel)
The SIR series of circular iris dampers have been made for the regulating and measuring of air flow for
circular ducts with diameters between 100 and 1000 mm. The special conical shape of the blades allows
them to be adjusted precisely, with a margin of error in the measurement of 5%, and to operate quietly.
The measurement of the air flow that passes through the damper is carried out by measuring the difference in the pressures at the two manometric inlets and reading it off the relevant diagram. The adjustment
is carried out manually by turning the graduated knob. A locking screw keeps fixed the calibration carried
out. The housing is classified as airtight in accordance with EN 1751 in class C. Operating temperature
range: from -30°C to +70°C.
Quick reference selection table
Q=2827
1000
Q=1810
800
Q=4241
Q=452
400
Q=2714
Q=346
350
Q=2078
Q=281
315
Q=1683
Q=177
250
Q=1060
Q=113
200
Q=679
Q=72
160
Q=434
Q=44
4 6 m/s
30000
20000
5000
6000
7000
8000
4000
3000
2000
5000
6000
7000
8000
9000
10000
4000
3000
2000
500
600
700
800
900
1000
400
300
200
500
600
700
800
900
1000
400
300
200
40
20
50
60
70
80
90
100
40
30
20
5
6
7
8
9
10
4
10
3
2
Q=170 m3/h
Q=28
100
vK 1
Q=265
50
60
70
80
90
100
125
30
ØN [mm]
Q=6733
Q=707
500
Q [l/s]
Q=10857
Q=1122
630
Q [m3/h]
Q=16965
Q [m3/h]
Q [l/s]
Legend
Q [m /h] or [l/s]
3
vk [m/s]
nominal diameter
average measured velocity
w w w. t e c n o v e n t i l . c o m
ØN [mm]
supply air flow rate
VER. 27/03/07
We reserve the right to make any modifications without prior notice.
1
SIR
Iris damper
Dimensions
Section Dimensions
SIR 100 ... 315
SIR 350 ... 1000
Section Dimensions
SIR 100 ... 315
ØN (mm) A (mm) B (mm) C (mm) ØD (mm) E (mm)
100
142
36
70
99
57
125
142
36
70
124
57
160
142
36
70
159
57
200
142
36
70
199
57
250
142
36
70
249
57
315
142
36
70
314
57
SIR 350 ... 1000
ØN (mm) A (mm) B (mm) C (mm) ØD (mm)
350
195
39
114
349
400
195
39
114
399
500
195
39
114
499
630
800
1000
195
195
195
39
39
39
114
114
114
629
799
999
H (mm)
70
70
70
70
70
85
Construction
External housing and fins in zinc plated steel; adjustment mechanism in plastic for diameters of 100 to
315 mm and in zinc plated steel for diameters between 350 and 1000 mm. The damper is equipped with
two circular nipple connectors with airtight rubber sealing rings. The pressure inlets are made of polyurethane.
2
VER. 27/03/07
We reserve the right to make any modifications without prior notice.
w w w. t e c n o v e n t i l . c o m
Iris damper
SIR
Operation
Regulation of the air flow is carried out by turning the knob, that enables the opening and closing of the
iris blades. Reducing the section generates an increase in the pressure loss across the damper causing a
reduction in flow rate. The flow rate value passing through can be determined by simply measuring the
differential pressure across the two manometric sockets and reading it off the corresponding diagram
attached to the damper.
SIR 100 ... 315
1
2
3
4
5
6
7
- Air direction indicator
- Adjustment knob
- Position locking screw
- Position indicator
- Position indicator for cleaning
- Regulating scale
- Pressure measurement inlets
SIR 350 ... 1000
1 - Air direction indicator
2 - Adjustment knob
3 - Position locking screw
Operation
N.B. the measurements are always carried out with the air flow that follows the direction of the arrows
visible on the damper.
w w w. t e c n o v e n t i l . c o m
VER. 27/03/07
We reserve the right to make any modifications without prior notice.
3
SIR
Iris damper
Technical data
Aeraulic data
The air flow rate passing through can also be arrived at using the following mathematical formula:
Q =k×
pm
Q [m3/h] or [l/s]
air flow rate
K
coefficient dependent on the diameter of the damper and the position of the
indicator on the knob (the values are shown in the table below)
Δpm [Pa]
difference in pressure measured across the two manometric inlets
Indicator position
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6
6,5
7,6
8,6
9,7
11,2
13,0
14,8
16,9
19,8
23,0
28,1
125
9,0
10,4
11,9
13,7
15,8
18,0
21,02
24,5
28,4
34,2
41,8
160
14,8
16,9
19,8
23,0
27,4
32,4
38,2
45,4
54,0
65,5
82,4
200
25,6
28,8
31,7
36,0
41,0
47,2
54,4
63,0
73,8
87,1
104,4
250
37,8
42,8
49,7
58,0
68,0
79,2
92,2
108,4
128,9
154,4
190,1
315
65,9
78,5
93,6
110,5
131,4
155,9
184,7
221,4
267,5
333,4
432,7
87,5
-
126,7
-
180,0
-
257,8
-
356,0
-
95,4
-
131,4
-
198,0
-
309,6
-
493,2
100
ØN (mm)
350
63,4
400
73,8
500
99,0
-
140,4
-
212,4
-
309,6
-
442,8
-
630,0
630
234,0
-
324,0
-
414,0
-
554,4
-
727,2
-
954,0
800
283,3
-
382,0
-
552,1
-
780,8
-
1095,9
-
1589,5
1000
518,4
-
792,0
-
1160,0
-
1584,0
-
2232,0
-
3204,0
Pr e s s u r e l o s s a n d n o i s e l e v e l s
4
SIR 100
SIR 125
SIR 160
SIR 200
VER. 27/03/07
We reserve the right to make any modifications without prior notice.
w w w. t e c n o v e n t i l . c o m
Iris damper
SIR
Pr e s s u r e l o s s a n d n o i s e l e v e l s
SIR 250
SIR 315
SIR 400
SIR 500
SIR 630
SIR 800
Q [m3/h] or [l/s]
passing flow rate
Δptot [mm]
total pressure loss
LpA [dB(A)]
Sound power level
SIR 1000
w w w. t e c n o v e n t i l . c o m
VER. 27/03/07
We reserve the right to make any modifications without prior notice.
5
SIR
Iris damper
Fixing systems
Installation
Affixing the SIR to a circular duct is carried out, for example, by means of rivets, making sure that they do
not compromise the opening/closing mechanism of the fins. The direction of the air is indicated on the damper itself by means of a visible indicator (arrow). For accuracy of measurement it is important to maintain
a safety distance from bends, tapering or junctions, that could interfere with the correct calibration of the
flow rate.
In particular the following distances should be maintained:
- 4 diameters before the SIR
- 1 diameter after the SIR
Examples of installations
6
VER. 27/03/07
We reserve the right to make any modifications without prior notice.
w w w. t e c n o v e n t i l . c o m
Iris damper
w w w. t e c n o v e n t i l . c o m
VER. 27/03/07
We reserve the right to make any modifications without prior notice.
SIR
7
SIR
8
Iris damper
VER. 27/03/07
We reserve the right to make any modifications without prior notice.
w w w. t e c n o v e n t i l . c o m
components for air-conditioning systems
tecno-ventil s.p.a.
Via Parma, 2
2 6 0 1 6 S p i n o d ’A d d a ( C R )
Te l . + 3 9 0 3 7 3 . 9 8 0 4 5 6
Fa x + 3 9 0 3 7 3 . 9 8 0 6 8 1
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