8
EB 2640 EN
Design and principle of operation
Stem locking for CIP or SIP
See section 6.1 on page 15.
Type 2371-10 and Type 2371-11 can be fit
-
ted with a stem locking to keep the plug in
the open position. This allows the regulator
to be cleaned (CIP or SIP) while the valve is
open.
The stem can be locked in place pneumati-
cally by an additional pneumatic unit with
compressed air connection (for Types 2371-
10 and 2371-11) or manually using a spe
-
cial pin (for Type 2371-11 only).
The pneumatic and manual stem locking do
not effect the control function of the valve,
provided the stem locking is not engaged.
The pneumatic unit for the pneumatic stem
locking is located on the top of the regulator.
The unit can be mounted in any position
since the axial fixture of the unit allows it to
turn 360°.
The pin of the manual stem locking is
screwed into the adjustment opening in
place of the blanking plug.
Pneumatic stem locking
· Types 2371-10/-11
Manual stem locking
· Type 2371-11
Stem locking engaged
Fig. 2:
Stem locking
ê
p
V
∙
G
1
/
8
connection
Pneumatic unit
Pin
Lock nut
