Burkert 2712 Series User manual

Operating Instructions
Bedienungsanleitung
Manuel d‘utilisation
Type 2712
Piston controlled flat-seat valve
Kolbengesteuertes Geradsitzventil
Soupape à tête droite commandée par piston
Actuator sizes 175 mm - 225 mm
Nominal diameters DN 65, DN 80, DN 100
Antriebsgrößen 175 mm - 225 mm
Nennweiten DN 65, DN 80, DN 100
Tailles de mécanisme 175 mm - 225 mm
Diamètre nominal DN 65, DN 80, DN 100

We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous réserve de modifications techniques.
© Bürkert Werke GmbH & Co. KG, 200 - 2017
Operating Instructions 1706/_EU-EN_008 / Original DE

2712 big - 1
CONTENTS
english
Contents of the
overall operating instructions for the
Piston controlled flat-seat valve
Actuator sizes 175 - 225 mm
Nominal diameters DN 65, DN 80, DN 100
GENERAL NOTES............................................................................................................................................................................................................................... 3
Symbols .................................................................................................................................................................................................................................................. 4
Safety information ................................................................................................................................................................................................................... 4
Scope of delivery....................................................................................................................................................................................................................... 4
Warranty conditions.............................................................................................................................................................................................................. 4
TECHNICAL DATA............................................................................................................................................................................................................................. 5
Construction of the control valve ..................................................................................................................................................................... 6
Media ........................................................................................................................................................................................................................................................... 6
COMISSIONING........................................................................................................................................................................................................................................ 7
Installation........................................................................................................................................................................................................................................... 8
MAINTENANCE AND SERVICING........................................................................................................................................................................... 9
Malfunctions................................................................................................................................................................................................................................. 10
Replacing the control cone..................................................................................................................................................................................... 10
Replacement of valve seat ....................................................................................................................................................................................... 12
Spare parts sets for standard valves ....................................................................................................................................................... 13

2 - 2712 big
CONTENTS
english

2712 big - 3
GENERAL NOTES
english
GENERAL
NOTES
Symbols .................................................................................................................................................................................................................................................. 4
Safety notes ...................................................................................................................................................................................................................................... 4
Scope of delivery ....................................................................................................................................................................................................................... 4
Warranty conditions .............................................................................................................................................................................................................. 4

4-2712 big
GENERALNOTES
hsilgne
Warranty conditions
This document contains no warranty statements. In this connection we refer to our general sales and
business conditions. A prerequisite for validity of the warranty is use of the device as intended with
observance of the specified conditions of use.
ATTENTION!
The warranty covers only faultless condition of the valveType 2712 with pneumatic
actuator and theTopControl.No liability will be accepted for consequential damage of
any kind that may arise from failure or malfunctioning of the device.
Scope of delivery
Immediately after receipt of a shipment, make sure that the contents are undamaged and match the
scope of delivery stated on the packing slip.
If there are discrepancies, please contact immediately our customer service:
Bürkert Fluid Control Systems
Sales Center
Christian-Bürkert-Str.13-17
D-76453Ingelfingen
Tel.:[phone]
Fax:[phone]
E-Mail:[e-mail]
Symbols
The following symbols are used in these operating instructions:
marks a work step thet you must carry out.
ATTENTION!
marks notes on whose non-observance your health or the functioning of the device will
beendangered.
NOTE
marksimportant additional information, tipsand recommendations.
Please observe the notes in these operating instructions together with the conditions of use and permitted
data that are specified in the data sheets for the pneumatically actuated valve and for the Top
Control
, in
order that the device will function perfectly and remain operable for a long time:
•Keep to standard engineering rules in planning the use of and operating the device!
•Installation and maintenance work are only allowed by specialist personnel using suitable tools!
•Observe the current regulations on accident prevention and safety for electrical devices during
operation and maintenance of the device!
•Switch off the supply voltage in all cases before intervening in the system!
•Note that in systems under pressure, piping and valves may not be loosened!
•Take suitable precautions to prevent inadvertent operation or damage by unauthorized action!
•Make sure that after an interruption to the electrical or pneumatic supply, the process starts up again in
awell-defined, controlled manner!
•Read the safety notes for the electrical part in the operating instructions for theTop
Control
.
•On non-observance of these notes and unauthorized interference with the device, we will refuse all
liability and the warranty on device and accessories will become void!
Safety notes

2712 big - 5
TECHNICAL DATA
english
TECHNICAL
DATA
Construction of the control valve ..................................................................................................................................................................... 6
Media ........................................................................................................................................................................................................................................................... 6

6 - 2712 big
TECHNICAL DATA
english
Liquid and gaseous media are suitable that do not attack the housing and seal materials.
Control medium:instrument air, Class 3 to DIN ISO 8573-1
Construction of the control valve
Media
NOTE
Theapproved operating pressuresand mediatemperatures are tobe takenfrom the data
sheet or rating plate.With regard to the permissible seat leakage rate, the values specified
in DIN EN 1349 are complied with, whereby for the steel/steel seal, leakage class IV
applies, and for the PTFE/steel seal, leakage class VI applies.
2/2-way piston controlled valve with control cone andY-housing.
Controlfunction A
(closed by spring force in rest position)
Controlfunction B
(openin rest position)
Actuatormaterial: PA(polyamide)
Housingmaterial: stainless steel 316L
Seal materials: steel/steel (1.4571) or PTFE/steel

2712 big - 7
COMMISSIONING
english
COMMISSIONING
Installation of the valve ......................................................................................................................................................................................................... 8

8 - 2712 big
COMMISSIONING
english
Procedure:
1. Remove the electrical and pneumatic supplies from the
Top Control .
2. Pulloff the pneumatichose betweenTop Control and actuator
at the control port of the latter.
3. Control function A:
Pressurize the lower control port of the actuator with
compressed air (6 bar), so that the control cone is lifted from
the valve seat and is not damaged.
Control function B:
With control function B, no compressed air must be applied
for this purpose.
4. Remove the actuator in the open valve position by
unscrewingthe threaded nipple(SW70)from the housing.
Installation of the valve
NOTE
Forapplications in aggressive media, werecommaend attachingall free pneumatic
connections to a pneumatic hose whose other end lies in a neutral atmosphere.
DN 65 80 100
Tightening torque
[Nm] 100 ± 5 120 ± 5 150 ± 5
Tightening torques for the threaded nipple (SW70)
ATTENTION!
Do not loosen the screw (SW65) above the
threadednipple!
screw
(SW65)
threadednipple
(SW70)
5. Before reinstalling the actuator (in the open valve position), grease the nipple thread with
stainlesssteel lubricant, e.g. Klüberpaste UH196-402 fromMessrs. Klüber andreplace
thegraphite seal.
6. After tightening the threadednipple (observe torque),the actuatorcan be alignedas required.
Forthis purpose,unscrew the screw(SW65) abovethe threaded nipple ca. ahalf-turn andbring the
actuator into the desired position.
Then retighten the screw with a torque of 100 ± 5 Nm.
ATTENTION!
For special applications such as for oxygen and analysis, use only the approved
lubricants.
Installationin anyorientation, butpreferably withthe actuatorabove.
Observe the direction of flow: with control valves the general rule is: inlet under seat!
Cleanpipingfrom contamination!
Before attaching the valve housing, make sure the piping is aligned!
If the housing is to be welded on, make absolutely sure that the drive unit is removed beforehand.
ATTENTION!
During this operation, the valve must also be in the open position.
Top Control
actuator
housing
lower
control port