Pneumatic actuated 3/2 way valve
Home position
Switched position
Faulty switching
The working connec-
tion 2 (A) is vented via
connection 3 (R).
Pressure connection 1
(P) is closed.
There is no working
pressure at the working
connection 2 (A).
Pressure is applied
to the safety valve
simultaneously via the Z
connections.
Working connection 2
(A) is connected to the
pressure connection 1
(P).
The valve systems
monitor themselves
for correct operation
with every switching
procedure (dynamic
monitoring).
Pressure is applied to
the Z connections with
a time difference of >
0.5 s.
The dynamic monito-
ring system detects the
delayed actuation and
prevents pressure build-
up at working connecti-
on 2 (A).
3 (R)
2 (A)
1 (P)
Z
1
Z
2
Z
1
Z
2
3 (R)
2 (A)
1 (P)
3 (R)
2 (A)
1 (P)
Z
1
Z
2
Incorporating
XSz8 - XSz50; XSz8V - XSz10V
02/22
Our policy is one of continued research and development. We therefore reserve the right to amend,
without notice, the specifi cations given in this document. © 2014 Norgren Ltd
7503578000000006
020
