Samson 3766 - Page 35

EB 8355-1 EN 35
Connections
Actuator stem retracts (FE):
Fail-open
(for globe and angle valves)
For tight-closing valves, the maximum signal
pressure pst
max
is roughly estimated as fol-
lows:
pst
max
= F +
d²·π·∆p
[bar]
4 · A
d = Seatdiameter[cm]
∆p = Differential pressure across the
valve[bar]
A = Actuatorarea[cm²]
F = Upper bench range value of the
actuator[bar]
If there are no specications, calculate as
follows:
Required supply pressure =
Upperbenchrangevalue+1bar
Pressure regulator
After tilting the cover plate back, the
pressure regulator (9) can be continuously
adjusted. When the adjuster is turned
counterclockwise as far as it will go, signal
pressuresforspringrangesupto2.5bar
are controlled. When the adjuster is turned
clockwise all the way, signal pressures for
springrangesupto6.0bararecontrolled.
If the signal pressure must not exceed a cer-
tain value, this limit can be adjusted using a
pressure gauge (accessories).