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Pneumatic stem locking
Type 2371-10 and Type 2371-11
See Stem locking for CIP or SIP on page
8.
Type 2371-11
The pressure p
= 6 bar applied to the pneu-
V
matic unit opens the valve. This causes the
plug stem to move together with the plug out
of the valve seat and opens the valve.
How to proceed:
1. Connect the pressure hose with min.
6 mm diameter to the G
2. Apply a pressure p
matic unit. This causes the set point screw
(6) to move and the plug to move out of
the valve seat and opens the valve.
3. To switch the valve back to its control
function, remove the pressure p
to return the pressure back to atmospher-
ic pressure.
4. The spring (16) pulls the actuating unit
back, allowing the plug stem to move
again for the control task.
EB 2640 EN
connection.
1
/
8
= 6 bar to the pneu-
v
= 6 bar
V
Cleaning and maintenance
Stem locking engaged
p
= 6 bar
V
Actuator housing
Stem locking
Pneumatic stem locking · Type 2371-11
6
Set point screw
7
Set point springs
8
Actuator housing of Type 2371-11
16
Spring
17
Actuating unit/diaphragm
p
Pressure for stem locking
V
Fig. 7: Pneumatic stem locking
p
V
G
connection
1
/
8
17
16
6
8
7
17
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