Product Overview

Mixing
These three-way zone valves are diverting valves.
However, they may be used as mixing valves
when connected in the return ow as shown in the
diagram at the right and if system and dierential
pressures are within the gray area of the chart
below.
+
Bypass Coil
Three-Way Valve in Return Flow
B
AB A
Pressure
(See
Chart)
14.5 (100)
11.6 (80)
20.3 (140)
17.4 (120)
8.7 (60)
5.8 (40)
4.3 (30)
94 (650)
2.9 (20)
14.5
(100)
29
(200)
43.5
(300)
58
(400)
72.5
(500)
87
(600)
101.5
(700)
116
(800)
130.5
(900)
System Pressure in psi (kPa)
Differential Pressure in psi (kPa)
Allowable Mixing Applications
(See also the VEZ-41/42/43 Series Data Sheet for an additional pressure vs. ow rate vs. valve size chart.)
(Diverting) Maximum Water Capacity—U.S. Gallons per Minute
Valve
Size
(inches)
Pressure Differential (psi)
Cv/1 2 3 4 5 6 8 10 15 20 25 30 40 50 60 75
psi
0.5 1.0 1.4 1.7 2.0 2.2 2.4 2.8 3.2 3.9 4.4 5.0 5.5 6.3 4.1 7.7 8.7
gpm
0.5
2.5 3.5 4.3 5.0 5.6 6.1 7.1 7.9 9.7 11.2 12.5 13.7 15.8 17.7 19.4 21.7
0.5/0.75
4.1 5.8 7.1 8.2 9.2 10.0 11.6 13.0 15.9 18.3 20.5 22.5 25.9 29.0 31.8 35.5
1.00 7.0 9.9 12.1 14.0 15.7 17.1 19.8 22.1 27.1 31.3 35.0 38.3 44.3 49.5 54.2 60.6
(Diverting) Maximum Water Capacity—Cubic Meters per Hour (m
3
/hr)
Valve
Size
(mm)
Pressure Differential (kPa)
1 10 20 30 40 50 60 80
Kvs/
100
150 200 300 400 500
kPa
15 0.9 0.27 0.38 0.47 0.54 0.60 0.66 0.76 0.85 1.04 1.20 1.47 1.70 1.90
m
3
/hr
15 0.21 0.68 0.96 1.17 1.35 1.51 1.66 1.91 2.15 2.60 3.00 3.70 4.30 4.80
15/20 0.35 1.12 1.59 1.94 2.24 2.51 2.75 3.17 3.50 4.34 5.01 6.14 7.09 7.93
25 0.60 1.91 2.71 3.32 3.83 4.28 4.69 5.41 6.00 7.41 8.56 10.48 12.11 13.54