Pfeiffer 14c Series, Maintenance Manual

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Drill fi tting holes to connect the shaft to the disc.
Then connect the disc and shaft using close-tolerance grooved pins
( 14 ).
Further assembly steps depend on the version concerned.
4.4.2.1 Assembling Butterfl y Valves in sizes DN 250 ( 10” )
and smaller
Insert the metallic seat ring ( 4 )with the graphite rings into the body.
Note:
On doing so, make sure that all parts are clean.
Place the O-ring ( 24 ) in the fastening ring ( 5 ).
Place the previously assembled fastening ring onto the sealing ring
and press it in using a hydraulic press.
Loosen the bonnet ( 7 ) again and push the tension spring
( 19 ) into the oblong hole/slot.
Fasten the bonnet as previously described.
4.4.2.2 Assembling butterfl y valves in sizes DN 300 ( 12” )
and
larger
Insert the metallic seat ring ( 4 ) with the graphite rings into the body.
Note:
On doing so, make sure that all parts are clean.
Place the fastening ring onto the sealing ring and position correctly
using the screws ( 27 ).
Tighten the screws evenly in a crisscross pattern.
4.4.3 Notice of attaching actuating elements
Note: Double-eccentric butterfl y control valves must al-
ways close with a clockwise rotation of the valve shaft!
Fig. 7 - Exploded view of the Butterfl y Valve Series 14c/ 74b with live-loaded V-ring packing
Item Description Material
1 Valve body 1.4408
2 Shaft 1.4462
3 Valve disc 1.4408
4
Sealing ring Nickel
Metallic seat ring PTFE with glass
5 Fastening ring 1.4408
6 Packing box fl ange 1.4571
7 Bonnet 1.4571
8 Washer 1.4571
9 V-ring packing 1.4305 / PTFE
10 Belleville spring washer 1.8159 / Delta Tone
11 Bushing PTFE with carbon
12 Bushing PTFE/glass or metallic
13 Body seal PTFE
14 Grooved pin DIN 1472, 1.4462
15 Spacer bushing 1.4571
16 Stud bolt DIN 938, A2-70
17 Nut DIN 934, A2-70
18 Lower disc PTFE
19 Tension spring 1.4310
20 Screw DIN 912, A2-70
21 Bushing 1.4571
22 Spacer bushing 1.4571
23 Bonnet seal PTFE with glass
24 O-ring Viton
25 Intermediate fl ange 1.4305
26 Screw DIN 912, A2-70
27 Screw DIN 912, A2-70
Table 3 - List of parts