Product Overview

.03
.06
∆
p
G
(l/s) (
gpm
)
0.1
1
0.2
0.3
0.5
(psi) (bar)
10
2
3
5
20
0.01
0.1
0.02
0.03
0.05
1.0
0.2
0.3
0.5
0.4
4
0.04
0.4
.30 .50 1.4
2.8
5.6
1 0.2 0.5 2 5 10 2
0
5
0
100 2
00
.015
46.00
20.00
10.00
9.00
7.00
5.00
2.00
1.50
1.00
0.70
0.50
0.20
(feet of head)
0.05
3.00
0.30
0.10
0.003
0.005
7.0
12.5
.02
0.3
.10 .20
.70
0.02
0.006
0.01
0.03
0.005
0.008
0.05
0.03
0.02
0.015
0.0115
0.0006
0.001
0.0004
0.00035
0.002
Code 142281A 1 1/2”
2 3
Position
1
2.5 0.5 1 .5 3.5 4
Cv
Max
Size 1 1/2"
0.5 1 1.5 2 2.5 3 3.5
Cv 2.0 3.3 5.6 8.1 10.9 13.4 14.9 16.8
Position
4
.03
.06
∆
p
G
(l/s) (
gpm
)
0.1
1
0.2
0.3
0.5
(psi) (bar)
10
2
3
5
20
0.01
0.1
0.02
0.03
0.05
1.0
0.2
0.3
0.5
0.4
4
0.04
0.4
.30 .50 1.4
2.8
5.6
1 0.2 0.5 2 5 10 2
0
5
0
100 2
00
.015
46.00
20.00
10.00
9.00
7.00
5.00
2.00
1.50
1.00
0.70
0.50
0.20
(feet of head)
0.05
3.00
0.30
0.10
0.003
0.005
7.0
12.5
.02
0.3
.10 .20
.70
0.02
0.006
0.01
0.03
0.005
0.008
0.05
0.03
0.02
0.015
0.0115
0.0006
0.001
0.0004
0.00035
0.002
Code 142291A 2”
2 3
Position
1
2.5 0.5 1 .5 3.5 4
Cv
Max
Size 2"
0.5 1 1.5 2 2.5 3 3.5
Cv 2.3 5.5 7.2 10.2 13.2 17.1 20.0 22.0
Position
4
Valve flow coefficient Cv versus knob position
Knob position
½"
142241A
¾"
142251A
1"
142261A
1 ¼"
142271A
1 ½"
142281A
2"
142291A
0.5
0.37 0.55 1.0 1.5 2.0 2.3
1.0
0.63 0.8 1.2 2.6 3.3 5.5
1.5
1.07 1.2 1.8 3.6 5.6 7.2
2.0
1.6 1.7 2.6 4.5 8.1 10.2
2.5
2.13 2.4 3.3 7.7 10.9 13.2
3.0 2.9 3.7 5.0 10.0 13.4 17.1
3.5 3.3 4.4 6.5 11.8 14.9 20.0
max 4.0 3.4 5.0 7.5 12.9 16.8 22.0
Flow formulas
∆p = (G/Cv)²
G = Cv · √∆p
Cv =
G
∆p
�
Code 142281A 1 1/2" Code 142291A 2"