Burkert 2712 Series Operating Instructions Manual

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

Operating Instructions

Bedienungsanleitung
Manuel d‘utilisation

We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous réserve de modifications techniques.

© Bürker t Werke GmbH & Co. KG, 200 - 2017

Operating Instructions 1706/_EU-EN_008 / Original DE

C

ONTENTS

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

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Malfunctions................................................................................................................................................................................................................................. 10

Replacing the control cone..................................................................................................................................................................................... 10

Replacement of valve seat ....................................................................................................................................................................................... 12

Spare parts sets for standard valves ....................................................................................................................................................... 13

2712 big - 1

C

ONTENTS

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2 - 2712 big

GENERAL

NOTES

GENERAL NOTES

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Symbols
Safety notes
Scope of delivery
Warranty conditions

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......................................................................................................................................................................................................................................

.......................................................................................................................................................................................................................

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4
4
4
4

2712 big - 3

GENERAL NOTES

Symbols

The following symbols are used in these operating instructions:

marks a work step thet you must carry out.

ATTENTION!

NOTE

hsilgne

Safety notes

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
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

a well-defined, controlled manner!

• Read the safety notes for the electrical part in the operating instructions for the Top

• 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!

marks notes on whose non-observance your health or the functioning of the device will
be endangered.

marks important additional information, tips and recommendations.

Control

Control

.

, in

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-76453 Ingelfingen
Tel.: [phone]
Fax: [phone]

E-Mail: [e-mail]

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 valve Type 2712 with pneumatic
actuator and the TopControl. No liability will be accepted for consequential damage of
any kind that may arise from failure or malfunctioning of the device.

4 - 2712 big

TECHNICAL

DATA

TECHNICAL DATA

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Construction of the control valve
Media

...........................................................................................................................................................................................................................................................

.....................................................................................................................................................................

6
6

2712 big - 5

TECHNICAL DATA

Construction of the control valve

2/2-way piston controlled valv e with control cone and Y-housing.
Control function A

(closed by spring force in rest position)

Control function B
(open in rest position)

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Actuator material: P A (polyamide)
Housing material: stainless steel 316L
Seal materials: steel/steel (1.4571) or PTFE/steel

Media

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

NOTE

The approved operating pressures and media temperatures are to be taken from the data
sheet or rating plate. With regard to the permissible seat leakage r ate, the v alues 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.

6 - 2712 big

COMMISSIONING

COMMISSIONING

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Installation of the valve

.........................................................................................................................................................................................................

8

2712 big - 7

COMMISSIONING

Installation of the valve

Installation in any orientation, but preferably with the actuator above.

Observe the direction of flow: with control valves the general rule is: inlet under seat!
Clean piping from 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.

Procedure:

1. Remove the electrical and pneumatic supplies from the
Top

Control

2. Pull off the pneumatic hose between Top

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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 m ust be applied
for this purpose.

4. Remove the actuator in the open valve position by
unscrewing the threaded nipple (SW70) from the housing.

A TTENTION!

.

Do

not

loosen the screw (SW65) above the

threaded nipple!

Control

and actuator

Top

Control

actuator

lower
control port

screw
(SW65)

threaded nipple
(SW70)

housing

5. Before reinstalling the actuator (in the open valve position), grease the nipple thread with
stainless steel lubricant, e.g. Klüberpaste UH1 96-402 from Messrs. Klüber and replace
the graphite seal.

A TTENTION!

For special applications such as for oxygen and analysis, use only the approved
lubricants.

6 . After tightening the threaded nipple (observe torque), the actuator can be aligned as required.

For this purpose, unscrew the screw (SW65) above the threaded nipple ca. a half-turn and bring the
actuator into the desired position.
Then retighten the screw with a torque of 100 ± 5 Nm.

A TTENTION!

During this operation, the valve must also be in the open position.

Tightening torques for the threaded nipple (SW70)

DN 65 80 100

Tight eni ng torque

[Nm]

100 ± 5 120 ± 5 150 ± 5

NOTE

For applications in aggressive media, we recommaend attaching all free pneumatic
connections to a pneumatic hose whose other end lies in a neutral atmosphere.

8 - 2712 big

MAINTENANCE AND SERVICING

MAINTENANCE AND

SERVICING

Malfunctions
Replacing the control cone
Replacement of valve seat
Spare parts sets

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.......................................................................................................................................................................................

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10
10
12
13

2712 big - 9

MAINTENANCE AND SERVICING

Malfunctions

Possible malfunctions concerning the actuator are listed in the operatinginstructions for the Top

ATTENTION!

Repairs to the actuator may only be carried out in the factory. Contact your Bürkert
branch or our Customer Service directly:

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Replacing the control cone

On the fluidic side, the control cone can be replaced in case of wear or damage. For this purpose, the
actuator must be disassembled from the housing.

Disassembly

Remove the electrical and pneumatic supplies from the Top
Pull off the pneumatic hose between Top
control port of the latter.

Control function A:

Pressurize the lower control port of the actuator with compressed
air (6 bar), so that the control cone is liftet from the valve seat and
is not damaged.

Control function B:

With control function B, no compressed air must be applied for this
purpose.
Remove the actuator in the open valve position by unscrewing the
threaded nipple (SW70) from the housing.

Bürkert Fluid Control Systems

Sales Center

Christian-Bürkert-Str. 13-17

D-76453 Ingelfingen
Tel.: [phone]
Fax: [phone]

E-Mail: [e-mail]

Control

Control

and actuator at the

.

screw
(SW65)

threaded nipple
(SW70)

Control

.

ATTENTION!

Do

not

loosen the screw (SW65) above the threaded nipple!

Replacing the control cone:

Knock out the dowel pin with a suitable driver.
Driver diameter Ø 8 mm
Pull off the control cone with the aid of two metal strips of equal
height that are clamped to the left and right of the spindle between
the control cone and the threaded nipple of the actuator. To pull off
the control cone, apply compressed air (approx. 6 bar) to the lower
control connection of the actuator.
Place the new control cone onto the end of the spindle.
Align the bores to each other.

ATTENTION!

10 - 2712 big

Do not damage the sealing surface or the control
contour!

dowel pin control

cone

MAINTENANCE AND SERVICING

Assembly

Support the control cone at ists cylindrical part with the aid of a V-block or the lik e.
Place the dowel pin in postion and carefully knock in with a hammer .
Bring the dowel pin into a central position relative to the spindle axis (knock it in up to the end of the
recess).
Before reinstalling the actuator (in the open valve position), grease the nipple thread with stainless
steel lubricant, e.g. Klüberpaste UH1 96-402 from Messrs. Klüber and replace the graphite seal.

A TTENTION!

After tightening the threaded nipple (SW70) (observe torque), the actuator can be aligned as required.
For this purpose, unscrew the screw (SW65) above the threaded nipple ca. a half-turn and bring the
actuator into the desired position.
Then retighten the screw with a torque of 100 ± 5 Nm an.

A TTENTION!

For special applications such as for oxygen and analysis, use only the approved
lubricants.

During this operation, the valve must also be in the open position.

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2712 big - 11

MAINTENANCE AND SERVICING

Replacement of valve seat

To replace the valv e seat, the actuator must be disassemb led from the housing. F or disassemb ly and
assembly, see "Replacing the control cone".

Unscrew the old housing seat using the assembly tool and a
spanner.
Clean thread and sealing surface in the housing with compressed
air.
Select a tool insert and screw it into the assembly tool.
Push the new seat onto the assembly tool, grease the thread with
stainless steel lubricant, e.g. Klüberpaste UH1 96-402 from
Messrs. Klüber.

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A TTENTION!

Place the attached seat by hand into the housing thread and
screw it in.
Tighten the seat with a torque wrench to the torque specified.

For special applications such as for oxygen and
analysis, use only the approved lubricants.

assembly tool

tool insert

(to match the nominal

diameter of seat)

valve seat

NOTE

On installing a valve seat with a different nominal
diameter, the order number f or the valve changes!

Tightening torques for seat assembly

Seat assembly tools

Housing DN Order no.

DN Torque

[Nm]

65 150
80 180

100 220

+10

+10

+10

15 652 604
20 652 605
25 652 606

12 - 2712 big

32 652 607
40 652 608
50 652 609