EB 8026 EN
9
Installation
4
Installation
4.1
Mounting position
The valve can be mounted in any desired
position. However, to avoid increase wear at
the packing, install valves in DN 100 or
larger in the upright position with the actua-
tor on top.
For valves fitted with an insulating section or
bellows seal and for actuators weighing
more than 50 kg, the actuator needs to be
supported or suspended.
NOTICE
Install the valve free of stress.
Pipeline routing
To ensure that the control valve func-
tions properly, the pipeline must be
straight and without any manifolds or
disturbances for a distance of at least
6 times the valve size (DN) upstream
and downstream of the valve. Con-
tact SAMSON if this distance cannot
be observed.
Flush the pipeline thoroughly before
installing the valve.
Note:
Only insulate control valves with in-
sulating section or bellows seal up to
the bonnet flange of the valve body
for medium temperatures below 0 °C
and above 220 °C.
Do not insulate valves mounted to
comply with NACE MR0175 require
-
ments.
4.2
Arrangement of the valve
Install the valve as shown in Fig. 2 depend
-
ing on whether it is to be used for mixing or
diverting service.
The installation examples apply to standard
operation with fail-safe action "actuator stem
extends" for heating applications and "actu
-
ator stem retracts" for cooling applications.
Fail-safe position
The valve shuts off the flow of the heating or
cooling medium.
The plug arrangement (i.e. either mixing or
diverting valve) is indicated on a label at-
tached to the valve body.
In DN 15 to 25, the plug arrangement is the
same for mixing and diverting valves.
4.3
Signal pressure line
Connect the signal pressure line for valves
with an actuator with "actuator stem ex
-
tends" fail-safe action to the connection on
the bottom diaphragm case, and for valves
with an actuator with "actuator stem re
-
tracts" fail-safe action to the connection on
the top diaphragm case.
In the Type 3277 Actuator, the bottom signal
pressure connection is located at the side of
the yoke under the bottom diaphragm case.
4.4
Strainer, bypass
We recommend installing a SAMSON
Type 2 Strainer upstream of the valve, and
upstream of both inlet ports in mixing valves.