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C_FLUID CONTROL CATALOGUE
>
2018
General terms and conditions for sale are available on
www.camozzi.com.a
APPENDIX
APPENDIX >
Info
s
1144,4
s
0,035x10
6
s
16,67
s
20
s
0,041x10
6
s
981,5
s
54,44
s
1,17
s
23
0,00009
s
28x10
-6
s
0,06
s
0,02
s
24x10
-6
s
0,001
s
0,018
s
0,86
s
0,043
s
Qn
Cv
Av
Kv
kv
S
a
/2
09
S (mm
2
)
ORIFICE (mm)
0,02
0,16
0,2
0,50
0,5
0,80
0,52
0,81
0,54
0,83
0,56
0,84
0,58
0,86
0,6
0,87
0,65
0,91
0,7
0,94
0,75
0,98
0,8
1,01
0,85
1,04
0,9
1,07
0,95
1,10
1
1,13
1,5
1,38
2
1,60
2,5
1,78
3
1,95
3,5
2,11
4
2,26
4,5
2,39
5
2,52
5,5
2,65
6
2,76
6,5
2,88
7
2,99
10
3,57
15
4,37
25
5,64
35
6,68
45
7,57
55
8,37
65
9,10
75
9,77
FLOW MEASURING
FLUID VISCOSITY
The flow of gases is indicated in Nl/min, of liquids in m
3
/h.
In fluid valves, the flow is obtained by using a Flow Coefficient Kv.
The Flow Coefficient Kv defines the quantity of water at a temperature
between 5°C and 40°C that passes through a valve when there is a ∆p of 1
bar between inlet and use.
Not all liquids have the same viscosity, i.e. that characteristic that can be
considered a sort of friction inside the liquid that opposes to its flowing. It is
the opposite of fluidity. Water runs quicker through a tube than a gel, because
it is less viscose than gel.
Viscosity affects the flow and the response times.
Do not confuse Viscosity with Density that is the relation between the Mass
of the liquid and the occupied Volume. The Camozzi solenoid valves can be
used with fluids with a max. viscosity of 37 cSt.
Viscosity can be of two types: Dynamic and Kinematic.
Dynamic viscosity is proportional to the value of the resisting force that oppo-
ses to the flowing of a liquid.
Kinematic viscosity is the relation between Dynamic Viscosity and the Density
of the liquid.
In other words, when a liquid passes through a conduct, its speed is minor
where it is in contact with the conduct (where there is more friction) and major
inside the flow.
Kv = quantity of water m
3
/h
kv = quantity of water l/min
Cv = quantity of water Gal/min
Av = flow coefficient m
2
Qn = flow rate l/min
S = orifice cross-section mm
2
To find the flow with different liquids, you need to divide the flow calculated
with water by the value of kinematic viscosity of the liquid to intercept.
Dynamic viscosity is the result of a mathematic calculation that considers the
trend of the speed curve inside the tube.
The flowing speed varies according to the Density of liquids, the relation
between Dynamic Viscosity and Density gives the value of Kinematic
Viscosity.
Dynamic Viscosity can be indicated in
Pa s (Pascal * second)
N s/m
2
kg/m s
1 Pa s = 1 N s/m
2
= 1 kg/m s
Kinematic Viscosity is indicated in St or cSt (Stoke or CentiStokes)
St = 100 cSt = 10
-4
m
2
/s
CONVERSION COEFFICIENTS