Samson 3767 - Page 17

EB8355-2EN 17
Mountingoncontrolvalves
Airpurgingofthespringchamber
Ifthespringchamberoftheactuatoristobe
purged with the exhaust air from the posi-
tioner,usepiping(Table3)toconnectthe
springchamber(with"actuatorstemex-
tends"version)totheconnectionblock.To
do so, remove the stopper from the connec-
tionblock.Foranactuatorwithfail-safeac-
tion "actuator stem retracts" and in
Type3277-5Actuatorswithaneffectivedia-
phragmareaof120cm²,theexhaustair
from the positioner is connected to the spring
chamberoveraninternalhole.
NOTICE
When the valve is installed, the side
cover of the actuator must be mount-
ed such that the vent plug points
downward.
1.2
D2
D1
15
Vent plug
Vent plug must point
downward when the
valve is installed
View onto the signal pressure connection
Leftattachment Rightattachment
Cover
Switchover plate
Intermediateplate(15)
Clamp(1.2)
Signalpressureborehole
240cm²
350cm²
355cm²
700cm²
120cm²
Type3277
Type3277-5
Fig.4: Mounting the clamp