Pfeiffer Chemie-Armaturenbau GmbH
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4.4 Assembly of the Butterfl y Valve Series 14c and
Series 74b with live-loaded V-ring packing
4.4.1 Preparation for assembling the Valve
Lay the valve body ( 1 ) on a clean surface so that the bearing area of
the shaft is within easy reach.
Press in the bearing bushing ( 12a ) as far as it will go into the bear-
ing hole. Then insert the spacer ( 22 ).
Note:
Butterfl y valves in nominal sizes DN 300 ( 12” ) are
assembled without a spacer ( 22 ).
Insert the butterfl y disc ( 3 ) into the body so that the bearing holes of
the disc are aligned with the bearing hole of the body.
Now insert the shaft ( 2 ) through the bearing holes of the body and
the disc.
Push the bearing bushing ( 12b ) as far as it will go over the shaft into
the bearing hole of the body.
Then insert the spacer ( 21 ).
Note:
Butterfl y valves in nominal sizes DN 100 ( DN 4” )
are assembled without a spacer ( 21 ).
Screw studs ( 16 ) into the body.
Insert the washer ( 18 ) into the indentation intended for it in the bon-
net ( 7 ).
Slide the bonnet seal ( 23 ) as well as the valve body sealing ( 13 )
onto the bonnet.
Note:
Butterfl y valves in nominal sizes DN 300 ( 12” ) are
assembled without a bonnet seal ( 23 ).
Insert the previously assembled bonnet into the bearing hole of the
body and position correctly with the studs.
Fasten tight the bonnet evenly with nuts ( 17 ) in a crisscross patter.
Push the thrust washer ( 8 ) over the shaft’s free end at the appropri-
ate place in the body.
Slide the PTFE V-ring packing ( 9 ) together in the sequence PTFE
bottom end ring, PTFE V-rings and steel V-ring over the shaft into
the body hole and press down using an assembling sleeve.
The arrangement of the V-rings is shown in the detail drawing
( Fig. 7 ).
Place the intermediate fl ange ( 25 ) on the body and position correctly
using the fi llister head screws ( 26 ).
Tighten the screws evenly in a crisscross pattern.
Slide the spacer ( 15 ) over the shaft and press it into the body at the
appropriate place.
Proceed in the same manner to add the set of spring washers
( 10 ). The arrangement of the cup springs is also shown in the detail
drawing ( Fig. 7 ).
Press the bearing bushing ( 11 ) into the stuffi ng box ( 6 ).
Carefully place the stuffi ng box which has just been assembled to-
gether onto the intermediate fl ange and position correctly using the
fi llister head screws ( 20 ).
Tighten the screws evenly in a crisscross pattern.
Position the two plane faces of the shaft so that they are parallel to
the disc and secure the shaft against further turning.
Note:
On doing so, make sure that the shaft adjoins the
washer ( 18 ).
Therefore observe the direction of rotation when installing the actua-
tor!
A label on the butterfl y control valve indicates the direction of rotation.
Fig. 6 – Indicating label stating the direction of rotation
The assembly of the valve is now completed.
