• Applications guide. • Installation diagram : the ...
Document source : www.wattsindustries.com
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DIMENSIONING OF MIXING VALVES IN GROUP MIXING
The precision, sensitivity, flow rate and durability of the mixing valve can be ensured only insofar as it is looked after, and before
all else, correctly chosen.
To define the size of the most suitable mixing valve for a determined use, the following elements must be known: the total instant
flow rate (see paragraph below) and dynamic pressure available at the outflow for the hot water, and for the cold water, the
mixing valve's supply pipes. It can be measured or calculated, by using the DARIES abacus.
This abacus can also be used to make sure the water speed is not excessive.
Never admit a static pressure of more than 10 bars.
CASE OF ULTRAMIX THERMOSTATIC MIXING VALVES
Calculation method
1 Define the Cumulated Flow rate of mixed water by multiplying the quantity of appliances to be supplied by the usual unit flow
rates (table below). (Consult us for any other application as necessary).
CASE
A
B
C
D
E
F
Temperature displayed
on the mixing valve
38°
38°
45°
45°
50°
50°
Type of tap on
outlet
flow control
mixing valve tap
flow control
mixing valve tap
flow control
the bathroom
appliances
Wash basin
12 l
6 l
10 l
6 l
8,4 l
6 l
Shower
12 l
8,4 l
10 l
7 l
8,4 l
6 l
Kitchen sink
12 l
8,4 l
10 l
7 l
8,4 l
6 l
Bathtub
20 l
_
16 l
--
14 l
--
Bidet
12 l
8,4 l
10 l
7 l
8,4 l
6 l
Sink for washing
20 l
14 l
16 l
11 l
14 l
10 l
up/pot washing and
other applications
1 - Usual bathroom appliance unit flow rates (needs of mixed water)
2 - Calculating the total instant flow rate to be supplied by the mixing valve. Depending in the nature of the work, choose the
decrease ratio of the flow rates corresponding with the quantity of appliances to be supplied (table below).
Multiply this ratio by the cumulated flow rate to obtain the instant flow rate.
Quantity of
1/2
3
4
5
10
15
20
25
30
35
40
50
60
70
appliances
Residences
1
0,70
0,60
0,50
0,33
0,27
0,23
0,21
0,19
0,17
0,16
0,14
0,13
0,12
Guest houses
Campsites - hospitals
1
1
1
1
0,82
0,67
0,57
0,52
0,47
0,42
0,40
0,35
0,32
0,30
spa installations
Stadiums and gymns
factory - school
1
1
1
1
1
1
1
1
0,86
0,76
0,68
0,57
0,49
0,42
swimming pool - barracks
Quantity of
80
90
100
110
120
130
140
150
160
170
180
190
200
> 200
appliances
Residences
0,11 0,105 0,10 0,097 0,093 0,087 0,083 0,08 0,078 0,076 0,074 0,072 0,07
0,07
Guest houses
Campsites-hospitals
0,27
0,26
0,25 0,242 0,232 0,217 0,207 0,20 0,195 0,19 0,185 0,18 0,175 0,175
spa installations
Stadiums and gymns
factory - school
0,38
0,35
0,32
0,30
0,28
0,26
0,24
0,22
--
--
--
--
--
--
swimming pool - barracks
2 - Decrease coefficients of flow rates K (simultaneity coefficients)
Summary :
CASE A B C D E F Temperature displayed on the mixing valve 38° 38° 45° 45° 50° 50° Type of tap on outlet flow control mixing valve tap flow control mixing valve tap flow control the bathroom appliances Wash basin 12 l 6 l 10 l 6 l 8,4 l 6 l Shower 12 l 8,4 l 10 l 7 l 8,4 l 6 l Kitchen sink 12 l 8,4 l 10 l 7 l 8,4 l 6 l Bathtub 20 l _ 16 l -- 14 l -- Bidet 12 l 8,4 l 10 l 7 l 8,4 l 6 l Sink for washing 20 l 14 l 16 l 11 l 14 l 10 l up/pot washing and other applications 1 - Usual bathroom appliance unit flow rates (needs of mixed water) 2 - Calculating the total instant flow rate to be supplied by the mixing valve.
Tags :
ale,rate,water,appliances,rates,quantity,below,control,tap,instant,supplied,ales,cumulated
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