V43/V243 Series Pressure-Actuated Water-Regulating Valves Product/Technical Bulletin
4
As indicated in Figure 4, the correct valve for this
application is a 3-inch medium-pressure (160/260 psi),
non-corrosive, commercially constructed V43 Series
Valve. The maximum water flow that a 3-inch valve can
deliver (300 GPM) under the stated condition is slightly
greater than the maximum water flow required (300
GPM).
Note:
The maximum flow required for the application
is to the left of the dotted vertical line between Point A
and Point B (300 GPM when the valve is approximately
72% open).
Select the valve type from Table 5 through Table 7.
Point Where Valve is Wide Open and Intersects
with the WPA Curve
Maximum Flow the Valve Provides Under the Given
Conditions (Valve Wide Open with a 10 psid)
Maximum Water Flow Required for the Application
Head Pressure Rise Above Opening Point Where
Maximum Flow Required for the Application Occurs
Point
A
Point
C
= 36 psig
= Appr. 330 GPM
= 300 GPM
Point
D
Point
B
= 50 psig
Figure 4: Correct Valve Size for Application
CAPACITY CHART FOR 3 in. VALVE
40
30
20
10
0
Medium Pressure
Refrigerants
Low Pressure
Refrigerants
10
100 200 300 400 500 600 700 800 900
20
30
50
Water Pressure Available Across Valve (psid)
40
50
30
20
10
0
R
e
fr
ig
e
ran
t H
ead
P
res
su
re
R
is
e
A
b
ov
e
V
a
lv
e
O
pe
nin
g Po
in
t (
p
si
g
)
Water Flow (GPM)
Point A
Point B
Point C
FI
G
:V
a
lv
e
S
ize
Point D
