Samson 3251 - Mounting the Actuator Onto the Valve

5-14 EB 8052 EN
Installation
5.3.2 Mounting the actuator
onto the valve
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. They can be identied by the long
bolts protruding from the bottom of the actu-
ator.
Î Before starting any work on the actuator,
relieve the compression from the pre-
loaded springs (see associated actuator
documentation).
Risk of personal injury due to incorrect re-
moval of the anti-rotation xture under ten-
sion.
Once the actuator has been mounted on the
valve and the assembly is ready for use, the
clamps (301) of the anti-rotation xture on
the plug stem are under tension.
Î Follow the instructions in this document
during mounting or removal.
Î Do not loosen the screws (303) of the an-
ti-rotation xture while the force generat-
ed by the supply air and/or the actuator
springs is transmitted to the actuator stem
and the stem (9).
Î First remove the actuator from the valve
or ensure it cannot transmit any forces to
the actuator stem before removing the
anti-rotation xture on the plug stem.
Depending on the version, SAMSON control
valves are either delivered with the actuator
already mounted on the valve or the valve
and actuator are delivered separately. When
delivered separately, the valve and actuator
must be assembled together on site.
Versions with V-port plug
To achieve the best ow conditions inside the
valve, the V-port plug must always be in-
stalled with the port that releases the ow
rst when the valve opens facing toward the
valve outlet. This is the largest of the three
V-shaped ports (see Fig.5-7).
Î Before mounting the actuator, determine
which V-shaped port is uncovered rst
when the plug is lifted out of the seat.
Î On mounting the actuator, make sure
that the V-shaped port uncovered rst
faces toward the valve outlet.
1x large V-port:
First to release the ow when the
plug is lifted out of the seat.
2x small V-ports
Fig.5-7: V-port plug
WARNING
!
WARNING
!