Pfeiffer 14c Series Guide

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Maintenance
Butterfly Valve Series 14b / 14c / 74b
0. Contents
1. Introduction 2
2. Design, operation and dimensions 2
3. Installation, start-up and maintenance 2
4. Assembly of the butterfly valve 2
4.1 Preparation for the assembly 2
4.2 Assembly of the Butterfly Valve Series 14b 2
with live-loaded V-ring packing
4.3 Assembly of the Butterfly Valve Series 14b and 4
Series 74b with adjustable Stuffing box flange
4.4 Assembly of the Butterfly Valve Series 14b 6
with live-loaded V-ring packing
5. Malfunctions and their elimination 8
6. Repair of the butterfly valve 8
7. Queries to the manufacturer 8
Fig. 1 - High-Performance Butterfly valve Series 14b
Fig. 2 – Variants of Butterfly Valves Series 14b, 14c and 74b

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1. Introduction
These instructions are intended to support the user in the assembly
and repair of Butterfly valves of the Series 14b, 14c and 74b.
Technical details, as a result of the further development of the valves
mentioned in these instructions, are subject to alteration.
The text and illustrations do not necessarily display the scope of
supply or an eventual order of spare parts. Drawings and graphics
are not to scale. Customer-related special designs, which are not in
accordance with our standard offer, are not shown.
The transfer of these instructions to third parties is only allowed with
the written approval of Pfeiffer Chemie-Armaturenbau GmbH.All
documents are protected according to the laws of the German Copy-
right Act. The transmission and/or duplication of documents, even
in abstracts, as well as the exploitation and communication of their
content is not permitted, unless expressly granted.
The equipment may only be dismounted and disassem-
bled by skilled staff who are familiar with the assembly,
the start-up and the operation of this product.
Skilled staff in the sense of these repair and assembly instructions
are persons who, as a result of their training, their knowledge and
their experience, as well as their knowledge of the relevant stand-
ards, are able to judge the tasks assigned to them and are able to
recognize possible dangers.
2. Design, operation and dimensions
Design, operation and dimensions as well as all further details and
technical data may be found in the data sheets < TB 14b_EN >for
Series 14b and 14c or < TB 74b_EN > for Series 74b.
3. Installation, start-up and maintenance
Guidelines for the installation, start-up and maintenance are to be
found in the operating instructions
< BA 14b-01_EN > for automatic Butterfly valves, resp.
< BA 14b-02_EN > for hand-operated butterfly valves.
4. Assembly of the Butterfly Valve
4.1 Preparation for the assembly
In order to assemble the valve, all the parts must be prepared, i.e. the
parts are carefully cleaned and placed on a soft surface (rubber mat
or similar).
Please, pay attention! Plastic parts are nearly always soft and very
sensitive, and particularly the sealing surfaces should not be dam-
aged.
Caution: In order to prevent a cold welding of the screws
in the bodies, a high-performance grease paste is em-
ployed during manufacturing (e.g. Gleitmo 805. from
Fuchs).
For valves employed in oxygen environments, this agent may not be
used. For grease-free valves, especially when employed in an oxy-
gen environment, a suitable lubricant is to be chosen.
Note: The position and arrangement of the individual parts
shown in the exploded view diagrams must be adhered to
on assembling the valve.
4.2 Assembly of the Butterfly Valve Series 14b
with live-loaded PTFE- V-ring packing
4.2.1 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: Butterfly control valves in nominal sizes DN 300 or
12” are assembled without a spacer ( 22 ).
Insert the butterfly 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: Butterfly control valves in nominal sizes DN 100 or
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: Butterfly control valves in nominal sizes DN 300 or
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. 3 ).
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 draw-
ing ( Fig. 3 ).
Press the bearing bushing ( 11 ) into the stuffing box ( 6 ).
Carefully place the stuffing box which has just been assembled to-
gether onto the intermediate flange and position correctly using the
fillister 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 ).

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Fig. 3 - Exploded view of the Butterfly Valve Series 14b with live-loaded V-ring packing
Item Description Material
1 Valve body 1.4408
2 Shaft 1.4462
3 Valve disc 1.4408
4Sealing ring PTFE with glass
Metallic seat ring Nickel
5Fastening ring 1.4571
6Packing box flange 1.4571
7Bonnet 1.4571
8Washer 1.4571
9V-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 1.4462
15 Spacer bushing 1.4571
16 Stud bolt A2-70
17 Nut A2-70
18 Lower disc PTFE
19 Tension spring 1.4310
20 Screw A2-70
21 Bushing 1.4571
22 Spacer bushing 1.4571
23 Bonnet seal PTFE with glass
24 O-ring Viton
26 Screw A2-70
27 Screw A2-70
Table 1 - List of parts
Drill fitting 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.
4.2.2.1 Assembling Butterfly Valves in sizes DN 250 ( 10” )
and smaller
Insert the PTFE-sealing ring or 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.
4.2.2.2 Assembling butterfly valves in sizes DN 300 ( 12” )
and larger
Insert the PTFE-sealing ring or 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.

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4.2.3 Notice of attaching actuating elements
Note: Double-eccentric butterfly control valves must al-
ways close with a clockwise rotation of the valve shaft!
Therefore observe the direction of rotation when installing the actua-
tor!
A label on the butterfly control valve indicates the direction of rotation.
Fig. 4 – Indicating label stating the direction of rotation
The assembly of the valve is now completed.
4.3 Assembly of the Butterfly Valve Series 14b
with adjustable stuffing box flange ( Type WNS )
4.3.1 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: Butterfly valves in nominal sizes DN 300 ( 12” ) are
assembled without a spacer ( 22 ).
Insert the butterfly 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: Butterfly valves in nominal sizes DN 100 ( 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: Butterfly 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.
Ring by ring of the PTFE-braided packing ( 9 ) is pushed over the
shaft manually and is then pressed into the bore of the casing by
means of a special mounting bush.
Press the bearing bushing ( 11 ) into the stuffing box ( 6 ).
Carefully place the stuffing box which has just been assembled to-
gether onto the intermediate flange and position correctly using the
fillister 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 ).
Drill fitting 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.

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Fig. 5 - Exploded view of the Butterfly Valve Series 14b with adjustable stuffing box flange
Item Description Material
1 Valve body 1.4408
2 Valve shaft 1.4542
3 Valve disc 1.4408
4 Sealing ring PTFE with glass
5 Fastening ring 1.4571
6 Adjustable stuffing box flange 1.4571
7 Bonnet 1.4571
8 Washer 1.4571
9 Braided packing PTFE
11 Bushing PTFE with carbon
12 Bushing PTFE/glass or metallic
13 Body seal PTFE
14 Grooved pin 1.4542
16 Stud bolt A2-70
17 Nut A2-70
18 Lower disc PTFE
19 Tension spring 1.4310
20 Screw A2-70
21 Bushing 1.4571
22 Spacer bushing 1.4571
23 Bonnet seal PTFE with glass
24 O-ring Viton
26 Screw A2-70
27 Screw A2-70
28 Thrust washer 1.4571
Table 2 - List of parts
4.3.2.1 Assembling Butterfly Valves in sizes DN 250 ( 10” )
and smaller
Insert the sealing ring ( 4 ) 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.
4.3.2.2 Assembling butterfly valves in sizes DN 300 ( 12” )
and larger
Insert the sealing ring ( 4 ) 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.
4.3.3 Notice of attaching actuating elements
Note: Double-eccentric butterfly control valves must al-
ways close with a clockwise rotation of the valve shaft!

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4.4 Assembly of the Butterfly 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: Butterfly valves in nominal sizes DN 300 ( 12” ) are
assembled without a spacer ( 22 ).
Insert the butterfly 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: Butterfly 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: Butterfly 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 flange ( 25 ) on the body and position correctly
using the fillister 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 stuffing box ( 6 ).
Carefully place the stuffing box which has just been assembled to-
gether onto the intermediate flange and position correctly using the
fillister 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 butterfly control valve indicates the direction of rotation.
Fig. 6 – Indicating label stating the direction of rotation
The assembly of the valve is now completed.

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Drill fitting 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 Butterfly 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 butterfly 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 butterfly control valves must al-
ways close with a clockwise rotation of the valve shaft!
Fig. 7 - Exploded view of the Butterfly 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
4Sealing ring Nickel
Metallic seat ring PTFE with glass
5Fastening ring 1.4408
6Packing box flange 1.4571
7Bonnet 1.4571
8Washer 1.4571
9V-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 flange 1.4305
26 Screw DIN 912, A2-70
27 Screw DIN 912, A2-70
Table 3 - List of parts

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Therefore observe the direction of rotation when installing the actua-
tor!
A label on the butterfly control valve indicates the direction of rotation.
Fig. 8 – Indicating label stating the direction of rotation
The assembly of the valve is now completed.
5. Malfunctions and their elimination
Assistance in the case of malfunctions is provided in the operating
instructions
< BA 14b-01_EN > for automatic Butterfly valves, resp.
< BA 14b-02_EN > for manually-operated butterfly valves under
section 7.
6. Repair of the butterfly valve
6.1 Exchange of the packing
If a leak is detected at the stuffing box, the PTFE rings of the packing
( 9 ) may be defect.
It is recommendable to check the condition of the packing.
To remove the packing, the valve is disassembled in the reverse
order to that described in chapter 3.
The PTFE rings of the packing are, together with all plastic parts,
checked for damage and, in case of doubt, exchanged.
Values subject to change
Issue May 2017 Maintenance EB 14b_EN
PDF=143
6.2 Exchange of the sealing ring
If the butterfly valve is untight in the bore, the sealing ring ( 4 ) may
be defect.
It is recommendable to check the condition of these components.
To remove the sealing ring, the valve is disassembled in the reverse
order to that described in chapter 3.
The sealing ring are, together with all plastic parts, checked for dam-
age and, in case of doubt, exchanged.
6.3 Further repair work
In case of further more serious damage, we recommend the repair
work to be carried out by Pfeiffer.
7. Queries to the manufacturer
(in case of queries please provide following information)
1. Order number (embossed on the type plate)
2. Type, product number, nominal diameter and design of
butterfly valve
3. Pressure and temperature of the flow medium
4. Flow rate in m³/h
5. Drawing of installation, if possible