Samson 3767 - Reversing Amplifier for Double-Acting Actuators

32 EB8355-2EN
Mountingoncontrolvalves
3.3.4 Reversingamplierfor
double-actingactuators
Fortheusewithdouble-actingactuators,the
positionermustbettedwithareversingam-
plier,e.g.theSAMSONType3710Revers-
ingAmplier(seeMountingandOperating
Instructions uEB8392).
The signal pressure of the positioner is sup-
plied at the output A
1
of the reversing ampli-
er.Anopposingpressure,whichequalsthe
required supply pressure Z when added to
the pressure at A
1
, is applied at output A
2
.
The rule A
1
+ A
2
= Z applies.
Ifadifferentreversingamplier(itemno.
1079-1118or1079-1119)isused,follow
themountinginstructionsdescribedbelow:
Mounting
NOTICE
When using a reversing amplier, the
pressure regulator (9) must be turned
as far as it will go in the clockwise di
-
rection.
Remove the sealing plug (1.5) before
mounting the reversing amplier. The
rubber seal (1.4) must remain in
-
stalled.
1. Screwthespecialnuts(1.3)fromtheac-
cessoriesofthereversingamplierinto
the threaded connections of the position-
er.
2. Insertthegasket(1.2)intotherecessof
thereversingamplierandslideboththe
hollowedspecialscrews(1.1)intothe
connectingboreholesA
1
and Z.
3. Placethereversingamplierontothepo-
sitioner and screw tight using the two
specialscrews(1.1).
4. Useascrewdriver(8mmwide)toscrew
theenclosedlters(1.6)intotheconnec-
tionboreholesA
1
and Z.
Signalpressureconnections
A
1
: Connect output A
1
to the signal pressure
connection on the actuator that causes the
valve to open when the pressure rises.
A2: Connect output A
2
to the signal pressure
connection on the actuator that causes the
valve to close when the pressure rises.
Pressuregaugeattachment
ThemountingsequenceshowninFig.11re-
mains unchanged. Screw a pressure gauge
bracketontotheconnectionsA
1
and Z.
Pressuregaugebracket:
− G¼1400-7106
− ¼NPT1400-7107
Pressure gauges for supply air Z and output
A
1
aslistedinTable4andTable5.