Samson 3767, Mounting And Operating Instructions

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EB 8355-2 EN 21
Mounting on control valves
Left attachment Right attachment
Mounting position on the plate looking onto the travel pick-up (20), actuator facing upward (see also Fig. 7)
Actuator with “actuator stem extends” (FA) fail-safe action
Direct operating direction
>>
Reverse operating direction
<>
Direct operating direction
>>
Reverse operating direction
<>
20
Pneumatic connections Electrical connection Electrical connection
Actuator with “actuator stem retracts” (FE) fail-safe action
Direct operating direction
>>
Reverse operating direction
<>
Direct operating direction
>>
Reverse operating direction
<>
Pneumatic connection Pneumatic connection Electrical connections
20
Fig. 6: Attachment to the left or right of the valve for NAMUR attachment (IEC 60534-6)
3.2 Attachment according to
IEC 60534-6
Required mounting parts are listed in
Table 5. The rated travel of the valve
determines which lever and range spring
(Table 6) are required.
An adapter housing is used for attachment
(Fig. 7). The valve travel is transmitted by the
lever (18) and the shaft (25) to the bracket
(28) of the adapter housing and then passed
on to the pin (27a) on the lever of the posi-
tioner. To ensure that the pin (27a) is proper-
ly located in the bracket (28), fix the spring
included in the accessories at the back of the
positioner housing as illustrated in Fig. 5.
Spring Screw plug
Fig. 5: Installing the spring on the back of the
housing
The positioner can be mounted either on the
left or right side of the control valve (Fig. 6
and Fig. 7). Turn the positioner at the adapt-
er housing by 180° to determine or change
the operating direction of the positioner/
control valve unit.