Samson 3253, Translation Of Original Instructions

Page: 42 / 92

5-14 EB 8055 EN
Installation
5.3.2 Mounting the actuator
onto the valve
Risk of personal injury due to incorrect
removal of the anti-rotation fixture under
tension.
Once the actuator has been mounted on the
valve and the assembly is ready for use, the
clamps (301) of the anti-rotation fixture 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 fixture 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 fixture on the plug stem.
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. They can be identified 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).
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 flow conditions inside the
valve, the V-port plug must always be in-
stalled with the port that releases the flow
first when the valve opens facing toward the
valve outlet. This is the largest of the three
V-shaped ports (see Fig. 5-7).
1x large V-port:
First to release the flow when the
plug is lifted out of the seat.
2x small V-ports
Fig. 5-7: V-port plug
Î
Before mounting the actuator, determine
which V-shaped port is uncovered first
when the top and bottom plug are lifted
out of the seat.
Î
On mounting the actuator, make sure
that the V-shaped port of both the top
WARNING !
WARNING !
AB A
B
AB
A
B
Fig. 5-8: Alignment of the V-port plug in mixing valves (left) and diverting valves (right)