Installation - Samson 3241-7 Mounting And Operating Instructions

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Installation

3.1 Mounting position
The valve can be mounted in any desired
position. However, vertical installation with
the actuator pointing upwards is preferable
for valves in nominal size DN 100 or larger
to facilitate maintenance.
For valves with extension bonnet or metal
bellows seal, or for actuators weighing more
than 50 kg, mount a suitable support or sus-
pension for the actuator.
Note!
The valve must be installed with the least
amount of vibrations possible and without
any stress.
Piping design
To allow the control valve to work properly,
the pipeline upstream and downstream of
the valve should be straight and free of ob-
structions for a length of at least 6 times the
pipe diameter (DN).
Contact SAMSON if this length cannot be
met during installation.
Clean out the pipeline thoroughly prior to in-
stalling the valve.
Note!
Valves that should meet the requirements of
NACE MR 0175 standard should not be in-
sulated.
3.2 Signal pressure line
Connect the signal pressure line to the lower
diaphragm case for valves with actuator
version "Actuator stem extends" and to the
upper diaphragm case for valves with actu-
ator version "Actuator stem retracts".
The lower signal pressure connection of the
Type 3277 Actuator is located at the side of
the yoke of the lower diaphragm case.
3.3 Strainer, bypass
We recommend you to install a SAMSON
Type 2 Strainer upstream of the valve body.
We also recommend to install a shut-off
valve both upstream of the strainer and
downstream of the valve, as well as a by-
pass, so that you do not need to shut down
the plant for maintenance.
3.4 Test connection
If there is a test connection (G 1/8) at the
upper flange of a valve version with metal
bellows seal (Fig. 6), you can check the
tightness of the bellows there.
Particularly for liquids and vapors, we rec-
ommend you to install a suitable leak indica-
tor at the test connection, such as a contact
pressure gauge, an outlet into an open ves-
sel or an inspection window.
4 Operation
(e.g. reversing the fail-safe action of the ac-
tuator etc.)
For details concerning operation, see
Mounting and Operating Instructions
EB 8310 EN for the Type 3271 Pneumatic
Actuator and
EB 8311 EN for the Type 3277 Pneumatic
Actuator.
Installation
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EB 8015 EN