Pfeiffer Chemie-Armaturenbau GmbH
Pfeiffer Chemie-Armaturenbau GmbH • Telefon: 02152 2005-0 • Telefax: 02152 1580 • E-Mail: [email protected] • Internet: www.pfeiffer-armaturen.com
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1. Introduction
These instructions are intended to support the user in the assembly
and repair of Butterfl y 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 Butterfl y valves, resp.
<
BA 14b-02_EN
> for hand-operated butterfl y valves.
4. Assembly of the Butterfl y 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 Butterfl y 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:
Butterfl y control valves in nominal sizes DN 300 or
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 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:
Butterfl y 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 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 ).
