Samson 3291, Translation Of Original Instructions

Page: 44 / 96

5-14 EB 8072 EN
Installation
Versions with perforated plug
Only one hole is located near the seal facing
of perforated plugs with equal percentage
characteristic. Depending on the valve size,
the hole pattern varies and is partly unsym -
metrical. The process medium in the valve
flows through the holes as soon as the plug
is lifted out of the seat. To achieve the best
flow conditions inside the valve, the perforat-
ed plug must always be installed with the
hole that releases the flow first when the
valve opens facing toward the valve outlet
(see Fig. 5-7).
Î
Before mounting the actuator, check the
hole pattern of the perforated plug and
determine which hole is the closest to the
seal facing and is uncovered first when
the plug is lifted out of the seat.
Î
On mounting the actuator, make sure
that the hole uncovered first faces toward
the valve outlet.
Perforated
plug
Hole closest to
the seal facing
of the plug
Plug
stem
Seal facing
Fig. 5-7: Perforated plug
a) Mounting the actuator
Î
To mount the actuator, proceed as de -
scribed in the associated actuator docu -
mentation.
b) 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 (see Fig. 5-5).
1. Move the valve to the closed position.
2. Loosen the screws on the travel indicator
scale.
3. Align the travel indicator scale.