Mounting The Actuator Onto The Valve - Samson 3349 Mounting And Operating Instructions

Installation
5.3.1 Mounting the actuator
onto the valve
WARNING
!
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. This can be identified by the long
bolts protruding from the bottom of the
Type 3271 or Type 3277 Pneumatic Actua-
tors.
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. 5-1).
Î Before mounting the actuator, determine
which V-shaped port is uncovered first
when the plug is lifted out of the seat.
Î On mounting the actuator, make sure
that the V-shaped port uncovered first
faces toward the valve outlet.
5-4
2x small V-ports
1x large V-port:
First to release the flow when the
plug is lifted out of the seat.
Fig. 5-1: V-port plug
a) Mounting a Type 3271 or
Type 3277 Actuator
Refer to Fig. 5-2
Î To mount the actuator, proceed as de-
scribed in the associated actuator docu-
mentation.
Î Make sure that the dimension x from the
bottom of the actuator stem to the bottom
of the actuator case is correctly adjusted
(see Table 5-2).
Aligning the travel indicator scale
After mounting the actuator, the travel indi-
cator scale must be aligned. To do so, align
'0' on the travel indicator scale with the tip
of the stem connector clamp.
1. Move the valve to the closed position.
EB 8048-2 EN