8
SHORT STROKE ACTUATORS
SP20 SHUT-OFF CAPABILITIES
The following table gives the approximate
maximum line pressure against which the spring
in a normally closed, air-to-open valve will hold.
VALVE SIZE
SP20 ACTUATOR
1/2”
195 PSI
3/4”
50 PSI
1” AND 1 1/2”
190 PSI
2”
100 PSI
2 1/2”
60 PSI
3”
45 PSI
1 1/2"
2"
2 1/2"
3"
60
70
80
90
100
110
120
130
10
20
30
40
50
60
70
80
90
100
A
ir P
ressu
re
(P
SI
)
Line Pressure (PSI)
SP10 ACTUATOR LINE PRESSURE CURVE
The chart below illustrates the air supply which
must be available to a normally-open; air-to-
close valve in order to fully shut off against the
corresponding fluid pressure.
