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Function
Test procedure B
If pressure p
< p
/2, valve V1 is tight. Valve V1 is
z
u
opened for the opening time t
During the measurement time t
checks the pressure p
z
If pressure p
< p
/2, valve V2 is leaking.
z
u
If pressure p
> p
/2, valve V2 is tight.
z
u
The tightness test can only be performed if the pres-
sure downstream of V2 is around atmospheric pressure
and the volume downstream of V2 is at least 5 x higher
than the volume between the valves.
The tightness control TC runs program A or Bdepend-
ing on the initial situation. Both valves are checked for
tightness respectively, but only one valve is opened at a
time.
During the test, the TC also checks their fail-safe opera-
tion.
After a brief power failure during the tightness test or
operation, the TC restarts automatically.
TC · Edition 08.17
= 2 s. V1 closes again.
L
, the tightness control
M
between the valves.
p
p
u
TEST
START
t
Test procedure A
+
p
>
z
V2
OK
V2
t
= 2 s
L
V2
t
M
+
p
u
p
>
z
2
–
V1
OK
V1
z
W
Test procedure B
–
p
u
2
V1
OK
V1
t
= 2 s
L
V1
t
M
–
p
u
p
>
z
2
+
V2
V2
OK
30
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