EB 8139 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/TS) valves with the valve
sizes DN 40 and 50 (NPS 1½ and 2) and
with 60 cm² actuators 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/TS
1440 N
1
3.8 bar
2160 N
2
5.4 bar
AUF/Open/Ouvert
FE/NO/TR
ZU/Close/Ferme
FA/NC/TS
Fail-open
Fail-close
CLOSED
OPEN
Fig. 3:
Signal pressure connection
