Brochure

8
Series STVL & STV,
1/2” – 2”
This diagram details the
relationship between flow,
pressure drop and valve pre-
set points. Use the diagram
to select the correct valve
size and corresponding
handwheel setting to fulfill
the application requirements.
Determine the required
flow in the circuit (A) and
the pressure drop (B). Draw
a line between these two
values. Read off the corre-
sponding Cv value on the
Cv scale (C).
Determine the valve setting,
in handwheel turns, by
drawing a horizontal line
(D) from the intersection
point on the Cv scale to
the corresponding valve
setting position.
For the highest level of
accuracy, it is recommended
to choose a valve that has
at least 3 open turns.
Example: A 1” valve is
required to be open 8 turns
for a Cv value of 7.5 at a
flow rate of 10 gpm and a
pressure drop of 4 ft.
PRESSURE DROP TABLES
I/s GPM
A
CD
B
Cv Kv Size: 1/2” 3/4” 1” 1 1/4” 1 1/2” 2”
Setting, number of turns
ft. kPa