Catalogue

WSHP-PRC025D-EN 11
Features and Benefits
Self-Balancing Hose Kits
The Hays self balancing valve contains a rubber diaphragm that is designed to flex into a contoured
orifice plate.This allows the valve to decrease the water flow path as pressure increases.The
pressure differential ranges of a Hays automatic valve covers 2 to 80 psid
1
.The flexing of the rubber
diaphragm against the fixed orifice plate makes the Hay’s valve difficult to clog and resistant to
cavitation damage. Outside of the pressure differential window, the controller continues to
perform as high as 150 psid, but does not become a fixed orifice.
Note: The Hays self balancing valve is a constant flow rate device that contains a variable orifice
to govern water flow. Since it is a variable orifice, it can not be described with a Cv or a
pressure drop at a given flow for piping system design purposes. Conversely, the designer
may assume a constant flow rate over the pressure differential range of 2 to 80 psid
1
as one
uses constant pressure in system design.
Table 5. Kit, 1 ball valve,Y-ball strainer & Measurflo automatic flow control valve, 24” hose
Flow Rate Size (in) 1/2 3/4 1 1¼ 1½
0.5 2.06 2.01
1 2.25 2.04 2.02
1.5 2.57 2.09 2.05 2.01
2 3.02 2.17 2.09 2.01 2.01
2.5 3.59 2.26 2.13 2.02 2.01
3 4.29 2.37 2.19 2.02 2.02
3.5 5.12 2.51 2.26 2.03 2.02
4 6.07 2.66 2.34 2.04 2.03
4.5 7.15 2.84 2.43 2.06 2.03
5 8.36 3.04 2.53 2.07 2.04
6 12.15 4.49 3.77 3.1 3.06
7 17.46 7.03 6.04 3.13 3.11
8 21.27 7.66 6.36 3.18 3.11
9 8.36 6.72 3.22 3.14
10 7.15 11.9 3.27 3.17
12 8.98 6.06 3.4 3.25
14 11.13 7.17 3.54 3.33
16 13.62 8.44 3.7 3.44
18 16.45 9.89 3.89 3.55
20 19.6 11.5 4.1 3.68
25 16.29 4.72 4.07
30 23.14 6.47 5.54
35 30.05 7.37 6.09
40 38.02 8.4 6.73
45 47.06 9.56 7.45
50 50.0 10.87 8.26
55 12.31 9.16
60 13.89 10.14
1
At low differential pressure the flow area required to achieve higher flow can exceed the flow area available for the respective series.
Therefore, the minimum pressure differential requirement is increased for the higher flow ranges of each series Mesurflo valve.