Pfeiffer Series 6a Setup guide

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This equipment may only be dismounted and disas-
sembled by skilled staff, who are familar with the as-
sembly, start-up and the operation of this product.
Skilled staff in the sense of these repair and assembly instruc-
tions, are persons who, as a result of their training, knowledge,
and experience, also their knowledge of the relevant standards,
are able to reconise possible dangers.
1. Design, operation and dimensions
Design, operation and dimensions, as well as all further technical
details can be found in the Data sheet < TB 06a_EN >
2. Installation, start-up and maintenance
Guidelines for the installation, start-up and maintenance can be
found in the respective operating instructions
< BA 01a-01_EN > for automatic control valves, i.e.
< BA 01a-02_EN > for manually operated control valve,
Fig. 2 - Sectional view of a micro-flow valve, Series BR 6a => Parts list, see Table 1 on page 2
Repair instructions
Micro-flow Valve Series 6a
Fig. 1 - Micro-flow valve Series 6a with Samson control actuator
0. Introduction
These instructions are intended to support the user in
the assembly and repair of micro-flow valves of the
series 6a.
Technical details, as a result of further development of
the valves mentioned in these instructions are subject to
modification.
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 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 Copyright Act.

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Pfeiffer Chemie-Armaturenbau GmbH • Phone: [phone] • Fax: [phone] • E-Mail: [email protected] • Internet: www.pfeiffer-armaturen.com
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Item Description Material
1 Body with casing EN-JS 1049 (GGG 40.3)
2 Bonnetr flange 1.0037
3 Bottom flange 1.0037
4 Seat PTFE
5 Bellows unit with plug PTFE
6 Thrust washer 1.4305
7 Spring washer 1.8159
8 Bushing Glycodur
9 Stem connector 1.4571
10 Wiper ring Buna
11 Grooved pin 1.4301
12 Screw A2-70
13 Screw A2-70
14 Nut A2-70
15 Grooved pin 1.4301
Table 1 - Parts list
3. The assembly of a micro valve
3.1 Preparation for assembly
To assemble the control valve, first clean all parts thoroughly,
and lay them on a soft padded surface ( rubber mat) or simi-
lar.
Take into consideration, that parts made of plastic are gener-
ally soft and sensitive, in particular the sealing surfaces must
handled with care, and not be damaged.
Attention: To avoid cold corrosion of the screws
in the bodies, the manufacturer has used a high
performance lubricating grease (i.e. Gleitmo 805.
from Fuchs).
This grease however, may not be applied to valves, which are
used in an oxygen environment. Valves which must be free of
grease, especially for use in oxygen, an appropriate lubrica-
tion must be used.
Note: The position and arrangement of the individu-
al parts shown in the explosion drawing (Fig. 3) must
be observed when assembling the valve.
3.2 Pre-assembly of the spindel unit
Apply grease to lower threaded end of the single unit stem.
( 9 )
Note: With the single versions, the stem consists of
three single parts. With a retainer ring, the guide is
pre-assembled with the stem.
The pre-assembled bellow unit ( 5 ) with the thread insert and
plug, is screwed tightly onto the guide stem. ( 9 )
( Due to a slide tendency of PTFE when the bellow unit is
screwed onto the stem, the use of a sandpaper lining has
proven to help avoid sliding.)
Fig. 3 - Explosion drawing of a micro-flow valve Series 6a

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The pressure ring ( 6 ) and the spring washer ( 7 ) are placed
on the upper side of bellow flange. ( 5 )
Refer to the explosion drawing ( Fig. 3 ) when positioning the
spring washers.
3.3 Pre-assembly of the bonnet flange
Press the glycodur bushing ( 8 ) with loctite in the bonnet
flange. ( 2 )
Through the existing bore in the bonnet flange, ( 2 ) drill a
3 mm hole in one side of the glycodur bushing. ( 8 ) Now
press the locating groove pin ( 15 ) into the bore.
The wipe off ring ( 10 ) is inserted into the upper part of the
bonnet flange. ( 2 ) Following this, insert the pre-assembled
stem unit (see section 3.2) into the bonnet.
Note: The locating groove pin in the bonnet flange
must be guided into the slot of the stem unit.
3.4 Pre-assemble of the valve body
The valve body, made of spheroidal cast iron, forms together
with the PTFE - liner and the bonnet flange ( 3 ) a complete
unit, which together with the grooved pins, ( 11 ) socket head
screws, ( 13 ) and hexagon nuts ( 14 ) are screwed together.
Note: The assembled valve body unit, must not be
disassembled.
With the use of a special tool, screw the PTFE - seat ( 4 )
into the specified seat bore of the body. ( 1 )
Note:
The tightening torque is 2 Nm.
3.5 Final assembly of the valve
Clamp the pre-assembled body ( see section 3.4 ) with the
bonnet opening facing upwards in a vice.
The pre-assembled bonnet flange ( see section 3.3 ) is placed
carefully onto the body, and aligned with the screws. ( 12 )
Attention: To avoid damage to the parts during as-
sembly, the bonnet flange, ( 2 ) of the valve plug ( 5 )
must not come in contact with the seat. ( 4 )
Tighten the screws ( 12 ) evenly, and in alternating pattern.
3.6 Stroke adjustment
If the micro valve and the Samson control actuator are deliv-
ered separately, the dimension „ A “ from the top of the stem
shaft nut to the top of the shell can be adjusted according to
table 2. This can be checked on assembly.
Fig. 4 - Stroke adjustment
Stroke adjustment with Samson actuator (valve closed)
DN A
6 bis 15 75 ± 0,1
Table 2 - Stroke adjustment
3.7 Stroke limit
• Stroke limit at 10 mm with the
operation mode „Actuator shaft retracting - STEF“
The limit for operation mode STEF, is effective by means of
a spacing washer with an inside thread. ( 1 ) This is screwed
and cemented with loctite onto the actuator shaft, ( 4 ) and sit-
uated between diaphragm shell ( 7 ) and diaphragm disc. ( 3 )
During the assembly, the springs under the diaphragm sur-
face are under tension.
Fig. 5 - Stroke limit with STEF
- For adjusting the hub limit, loosen the screws ( 5 ) and
nuts ( 6 ) and remove the upper diaphragm ( 7 ).
- The distance washer ( 1 ) is screwed and cemented with
loctite onto the actuator shaft. ( 4 )
- Following this, tighten the upper diaphragm ( 7 ) with the
screws ( 5 ) and nuts ( 6 ) evenly, and in alternating
pattern.

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Specitications are subject to change without notice
Issue May 2013 Repair instructione EB 06a_EN
• Stroke limit at 10 mm with the 0peration mode „Actua-
tor shaft extended - STAF“
The stroke limit for operation mode STAF for kvs 0,005;
0,01; 0,05 and a bore seat of 2 mm can be set by using the
positioning screw
The max. stroke of 10 mm must on no account be exceeded.
Otherwise the plug when opened, will not be guided into the
seat, this means a central guidance in the bore seat can not
be ensured, which could cause extreme damage or even
break off, when the valve is closed.
Fig. 6 - Stroke limit with STAF
- For adjusting the stroke, a hole for a threaded screw
M10 x 1 is bored in the middle of the upper part of the
diaphragm ( 7 ).
- When the assembly of the actuator on the valve is
completed, the screw M10 x 1 ( 8 ) with the counter nut
( 9 ) is screwed in position.
- With this screw ( 8 ) the exact stroke limit can now be set,
and with the counter nut ( 9 ) locked in position.
Assembly of the control valve is now completed.
4. Trouble shooting
Action to be taken in the event of malfunction is described in
the Operating instructions under section 7
< BA 01a-01_EN > for automatic control valves, i.e.
< BA 01a-02_EN > for hand operated control valves.
5. Repair of the micro valve
5.1 Replacing the bellow unit and the wipe off ring
If leakage is located at the stuffing box, the wipe off ring, and
the bellow unit may be defect. It is therefore recommended to
check the condition of all seals and the bellow unit.
To dismantle the wipe off ring and the bellow unit, proceed
in reverse order to the assembly instructions for the valve in
section 3
As with all other plastic parts, proceed to check the wipe off
ring, and the bellow unit for damage, and if necessary replace
these parts.
5.2 Other repairs
We recommend larger repairs to be carried out in our factory,
by our skilled at Pfeiffer.
6. Customer inquiries
( by inquiries, please state the following: )
1. Commission number ( embossed on the type plate )
2. Type, manufacturer number, nominal diameter, and
control valve design.
3. Pressure and temperature of the media flow
4. Through flow in m³/h