Schako VLV55, Technical Documentation Manual

Page: 9 / 31

VLV55|VLV65 - Volumetric flow controller
TECHNICAL DOCUMENTATION
VLV55 - flow generated noise - relative sound spectrum |
Construction subject to change
No return possible Version: 2017-04-24 | Page 9
VLV55 - FLOW GENERATED NOISE - RELATIVE SOUND SPECTRUM
NW100
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
-6 -8 -6 -1 -4 -13 -18 -25
NW125
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
-8 -9 -5 -1 -3 -12 -19 -26
Size 160
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
-6 -7 -3 -1 -4 -9 -17 -27
NW200
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
-6 -5 -1 0 -7 -11 -18 -26
NW250
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
-1 -2 1 -1 -7 -10 -18 -28
Size 315
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
-3 -1 3 -1 -6 -10 -18 -28
Differential pressure range: 0 - 300 Pa
Air velocity: 0.5 - 5.0 m/s
K
L
= correction value; relative sound power level, relative to L
WA
K
LW
= L
WA
+ {K
L
}
C A L C U L A T I O N E X A M P L E
VLV55 design data
NW 160 mm | V=247 m³/h |
p=100 Pa | L
WA
= 60 dB(A)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
-6 -7 -3 -1 -4 -9 -17 -27
Calculate sound values according to formula
K
LW(relativ)
= L
WA
+ {K
L
}
gives
Hz 63 125 250 500 1000 2000 4000 8000
L
WA
60 60 60 60 60 60 60 60
K
L
-6 -7 -3 -1 -4 -9 -17 -27
K
LW
54 53 57 59 56 51 43 33