Electro-pneumatic actuation
Home position
Switched position
Faulty switching
The working connec-
tion 2 (A) is vented via
connection 3 (R).
Pressure connection 1
(P) is closed..
The solenoids in
the safety valve are
actuated simulta-
neously.
Working connection
2 (A) is connected to
the pressure connec-
tion 1 (P).
The valve systems
monitor themselves
for correct operation
with every switching
procedure (dynamic
monitoring).
The solenoids are
actuated with a
time difference
>0,5 s.
The dynamic
monitoring system
detects the delay-
ed actuation and
prevents pressure
build-up at working
connection 2 (A).
Y1
Y1
Y1
Y2
Y2
Y2
3.5 Design and function
The safety SCVA valve is designed as a dual valve with piston valve. It comprises two
mechanically separated pilot control systems and main valve systems. The pilot control
systems are electro-pneumatic actuated.
7503618000000006
013
Incorporating
SCVA
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