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VRS-LP • Constant air volume control dampers

  • Circular
  • Galvanized steel
  • For low air speeds
  • 40-500 Pa

Adjustable self-regulating constant air volume control dampers in galvanised steel.

To be used to regulate airstreams at pressures between 40 and 500 Pa and temperature ranges between –30°C and 100°C. Air-flow value can easily be changed by use of an allen key SW2

Application

  • For air volume regulation in ventilation and air-conditioning systems with following air volumes and duct sizes
    • Ø80: adjustable between 25 & 80 m³/h
    • Ø100: adjustable between 40 & 125 m³/h
    • Ø125: adjustable between 65 & 220 m³/h
    • Ø160: adjustable between 100 & 350 m³/h
    • Ø200: adjustable between 160 & 500 m³/h
    • Ø250: adjustable between 240 & 800 m³/h
  • Accuracy: +/- 10% of the set air volume

Material

  • Galvanized steel housing
  • Aluminium regulation blade with piston and spring

Composition

  • Round housing made out of laser welded galvanised steel in standard duct sizes according to DIN EN 12237
  • Airtight connection up to class D with EPDM rubber according to DIN EN 12237
  • Balanced self-regulating aluminium blade with PTFE bearing and piston to prevent oscillations

Mounting

  • To be inserted at both sides into a round duct and to be equipped with a silencer if necessary
  • horizontal or vertical mounting

Accessories

  • Stainless steel models or insulation shells available upon request

Text for tender

Copy
  • The constant volume control dampers shall be of the circular type, made of galvanized steel and to be inserted at both ends in to the ductwork. They shall contain a self regulating valve, piston and stainless steel spring and shall have an adjustable air volume. The valves shall be used for a pressure range between 40 and 500Pa.
  • Cairox Type VRS-LP

Order example

  • VRS-LP, 125

Explanation

VRS-LP= Type of constant air valve

125 = Duct diameter

Other available products

  • Version ATEX available upon request

Dimensions

VRS-LP

ØD [mm]

L1 [mm]

L2 [mm]

H [mm]

80

79

140

40

70

100

99

170

40

70

125

124

170

40

70

160

159

240

40

70

200

199

240

40

70

250

249

240

40

70

Sound data

Øv (m/s)Q (m³/h)Lw [dB/Oct] - 100 PaLw(A)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
801.425293332323233282737
2.952393937363536313041
4.480484643413939333144
1001.440323434333334292739
2.982464340373535282741
4.4125504845424040333245
1251.565353636353536302941
3.2142484642393737302943
5220525047444242363448
1601.4100373838373636302841
3.1225494743403837312943
4.8350535148454342363548
2001.4160404140383837312943
2.9330504744403837302943
4.4500545148454342363448
2501.4240424241393838312843
2.9520514845413938312944
4.5800555349464443373549
Øv (m/s)Q (m³/h)Lw [dB/Oct] - 250 PaLw(A)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
801.425384040404142363546
2.952404344454649444453
4.480515150484849444454
1001.440414242424243383648
2.982504948464546404051
4.4125535351505050454555
1251.565434545444445393749
3.2142525250494848434253
5220615956535151444356
1601.4100464746454545393750
3.1225545452504949434254
4.8350626057545251454357
2001.4160484948474646403851
2.9330565552504949434255
4.4500595856545454484759
2501.4240515150484747403752
2.9520575654525050444356
4.5800616058565555494860
Øv (m/s)Q (m³/h)Lw [dB/Oct] - 500 PaLw(A)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
801.425454747474748434253
2.952464950525355515159
4.480575756555556515060
1001.440474949494950444354
2.982505253545557525261
4.4125595958575657525162
1251.565505251515151454456
3.2142535556575759545463
5220626260595959545364
1601.4100535453525252454457
3.1225565858595960555465
4.8350646462606060555465
2001.4160555655545353464458
2.9330586060606061555465
4.4500656563616061555466
2501.4240575856555453464459
2.9520616262626162565567
4.5800676765636262565567

Symbols and specifications

  • Q [m³/h] = Air volume in m³/h
  • Ø = Duct diameter in mm
  • 100Pa, 250Pa of 500Pa = Static pressure in Pa
  • Lw[dB/Oct] = Generated sound power in the duct divided into dB per octave band

Radiated sound data

ØΔLw [dB/Oct] - non insulated duct
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
803633322317121111
1003432302216121110
1252929312421191511
16023232018111098
20022191616151198
25019161312121098
         
ØΔLw [dB/Oct] - insulated duct (25mm)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
803935393532333429
1003835383431333428
1253533373632333627
1602726282927313125
2002318232629292924
2502318202426302824
         
ØΔLw [dB/Oct] - insulated duct (50mm)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
804237454647545647
1004138464547545747
1253536424851605845
1602928354044515444
2002622293742515343
2502520263541505242

LW2 = LW - ΔLW
LW2 = Case radiated noise in dB
LW = Sound power given for the frequencies f[Hz] from 63 up to 8000 Hz
ΔLW = Correction values for case radiated noise in dB
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