EB 8140 EN
19
Mounting and start-up
Î
Blow through all air pipes and hoses
thoroughly before connecting them.
5.3
Additional fittings
Strainers
We recommend installing a SAMSON
strainer upstream of the valve. It prevents sol-
id particles in the process medium from
damaging the valve.
Additional actuator spring (changing the
spring force)
Fail-close (FA/NC) valves with the nominal
sizes DN 40 and 50 (NPS 1½ and 2) and
with 60 cm² actuators (Ø = 90 mm) can be
fitted with one or two actuator springs
(marked on the nameplate with
I
or
II
). See
section 2.1.
By adding a spring or removing the internal
spring, the permissible differential pressure
and associated signal pressure can be
changed.
Actua-
tor
Version
Spring
force
Quantity
of
springs
Signal
pressure
60 cm²
FA/NC
1440 N
1
3.8 bar
2160 N
2
5.4 bar
It is not possible to change the fail-safe ac
-
tion.
Note
AUF/Open/Ouvert
FE/NO/TR
ZU/Close/Ferme
FA/NC/TS
Fail-open (FE/NO) version
Fail-close (FA/NC) version
Fig. 3:
Signal pressure connection · DN 15 to 50