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Pneumatic stem locking
Type 2371-10
To open the valve, apply a pressure p
1 bar) to the pneumatic unit. This causes the
plug stem to move together with the plug out
of the valve seat. A set point pressure p
not be applied to the regulator in this case.
To switch the valve back to its control function,
remove the pressure p
Type 2371-11
To open the valve, apply a pressure p
6 bar) to the pneumatic unit. This causes the
plug stem to move together with the plug out
of the valve seat, opposing the spring force.
To switch the valve back to its control function,
remove the pressure p
Manual stem locking
Type 2371-11 only
To lock the stem into place, screw the pin into
the opening on top of the actuator housing in
place of the blanking plug. The end of the pin
comes to rest on the head of the set point
screw. As the pin is screwed into the valve, it
pushes the plug into the open position over
the set point screw and upper plug section. A
mechanical stop prevents it from being
screwed in any further, protecting the dia-
phragm from overstretching or rupturing. Se-
cure the position using the lock nut.
When the groove of the pin is completely con-
cealed, the stem locking is active, whereas a
visible groove means it is disengaged.
EB 2640 EN
must
C
(= 1 bar).
V
(= 6 bar).
V
Design and principle of operation
(=
V
(=
V
9
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