Samson 3767 - Page 35

EB8355-2EN 35
Connections
Actuatorstemretracts(FE):
Fail-open
(forglobeandanglevalves)
Fortight-closingvalves,themaximumsignal
pressure pstmax 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pres-
sureregulator(9)canbecontinuouslyad-
justed. When the adjuster is turned counter-
clockwise as far as it will go, signal pres-
sures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).