weighing technology. Its very low inherent resistance makes it very suitable for decoupling scales / load cells.

Bellow designHigh-corrugated rubber bellow with reinforcement and shaped sealing bead with core ring, self-sealing (no additional seals required). Suitable for swiveling flanges.

Vacuum resistanceCan be used up to -200 mbar without additional accories, full vacuum possible with vacuum supporting spiral/ring.

Flange versionBoth sides with swiveling flange made of galvanized steel with threaded holes, drilled according to DIN PN 10 (standard). Other materials and dimensions are possible.

Approvals/ConformitySimilar to DIN 4809 / TÜV approved, drinking water and shipbuilding approval, FDA and EG 1935/2004 conform

Type 49 is a high-corrugated, highly elastic rubber expansion joint. Its high corrugation means that it has very low inherent resistance. It reduces up to 98 % of structure-borne noise. It is also characterised by very high movement absorption for a short installation length and variety of rubber qualities, which means that a suitable rubber compound is avail-able for every application (see material descriptions).

Type 49 is primarily used in building technology, where it is used to absorb expansion, vibration and to insulate sound. It is also used in industrial applications, particularly in the field of

TYPE 49 WILLBRANDT RUBBER EXPANSION JOINT

Colour code

EPDMIIR

NBRNBRCSMIIR

Colour

marking

Core

(inner)

Rein-

forcement

Cover

(outer)

Short-

term°C

Surface

resistance Ro[Ohm x cm] °C bar °C bar °C bar °C bar

RedBlue

YellowWhiteGreen

Black-EPDM*

PEEKPolyamidePolyamidePolyamidePolyamidePolyamide

EPDMEPDM

CRCR

CSMEPDM

-40-40-20-20-20-45

705050505050

1007070707070

1201009090

100100

10101010106

150120100100110110

371137

xxxx xx

103

106

102

109

1011

106

1616

16 16 16

8

202020202010

161616161610

Bellow Bellow design Permissible operating data

SPECIFICATIONS FOR DN 32 - DN 80

Bursting pressure: 75 bar*Black EPDM 30 bar

BG08/2018 – Subject to alterations and misprints www.belman.com1 / 6

Important information For aggressive media, please see the resistance table (can be requested separately).

The bellows should not be painted or insulated. Please refer to the installation instructions.

We will be happy to send you further information on the individual types and designs.

solutions, weak acids and weak alkaline solutions. Not suitable for oil products or cooling water with additives containing oil. Electrially dissipative inner surface and electri-cally conductive outer surface.

Type 49 yellow For oils, lubricants, fuels, gases, city and natural gas (not liquefied). Electrically conductive surface.

Type 49 whiteFor foodstuffs containing oil and fat (rubber in food-grade). Electrically insulating inner surface,

APPLICATION

Type 49 A-red For heating installations according to DIN 4809. For many years of opera-tion under constant loading with hot water and heating water at 100 °C/110 °C at 10 bar/6 bar operating pressure. Electrically conductive surface. Not suitable for media with additives containing oil.

Type 49 blue For drinking water, hot water, sea water, cooling water with chemical additives for treating water, saline

electrically conductive outer surface. Not suitable for drinking water.

Type 49 green For chemicals, aggressive chemical wastewater and compressor air containing oil. Electrically insulating sufrace.

Typ 49 schwarz, EPDMFor hot and cold water, sea water, cooling water, weak acids and alkali solutions, technical alcohols, esters and ketones. Electrically dissipative inner surface, conductive outer surface. Max. pressure 10 bar.

BG08/2018 – Subject to alterations and misprints

Can be used for movement absorption in any direction (for combined movements, see the movement diagram in the technical appendix), noise and vibration insulation.

The expansion joint’s reaction force must be absorbed via suitable piping.

DESIGN A - WITHOUT TIE RODS

2 / 6 www.belman.com

Permissible degree of utilisation for movement areas:- up to 50 °C: Utilisation ~ 100 %- up to 70 °C: Utilisation ~ 75 %- up to 90 °C: Utilisation ~ 60 %

*1 WF = effective area*2 Other standards/dimensions possible.

DN WeightLength

BL

mm

Flange PN 10*2 Movement absorption

AX LA

Bellow

ØA

mm

ØD

mm

ØPCD

mm

CØ

mm kg

M s

mm

+

mm

-

mm

+/-

mm

°

+/-

nWF*1

mm2

3240506580

100125150175200250300350400500

100100100100100100100100100100100100100110110

110110120135150170195260310310360410460515615

18001800350056008700

13000190002630041600416006070083000

110000138500209100

140150165185200220250285315340395445505565670

100110125145160180210240270295350400460515620

M16M16M16M16M16M16M16M20M20M20M20M20M20M24M24

4448888888

1212161620

161616161818182020202020202525

202020202020202020202020202020

303030303030303030303030303030

303030303030303030303030303030

777777777777777

797989

104119142169195245245295345396450550

3.03.64.45.36.57.38.9

12.316.216.220.323.130.143.253.8

DIMENSIONS FOR DESIGN A

AN

BG08/2018 – Subject to alterations and misprints

There is a selection of various length limiters / tie rods to absorb the reaction force and to protect the bellow from overstretching or collapsing:

Design B*with tie rods

Design C*with tie rods/thrust limiters

Design Ewith tie rods and spherical washers/conical sockets

Design Swith tie rods/thrust limiters and spherical washers/conical sockets

*Note: In Designs B and C the lateral movement absorption is reduced by around 50 %.

LENGTH LIMITERS

3 / 6 www.belman.com

Accessories

l Vacuum supporting spirals / rings

l Guide sleeves

l Potential equalisation

l Flame-resistant protective covers

l Dust and splash protection covers

l Earth cover hoods

DN

Flange PN 10 (example dimensions) Sn

Length

BL

mm

3240506580

100125150175200250300

100100100100100100100100100100100100

1616161618181820

44488888

B

mm

230240255275290310340375415440509559

ØD

mm

140150165185200220250285315340395445

ØPCD

mm

100110125145160180210240270295350400

M

M16M16M16M16M16M16M16M20M20M20M20M20

ØC

797989

104119142169195

FLANGE DIMENSIONS FOR DESIGNS WITH TIE RODS

BG08/2018 – Subject to alterations and misprints

Important information Various bolt packs (SU) are available for the standard design.Please note the appropriate fixed point

constructions and plain bearings in yourpiping system! For more information please refer to our installation

instructions.We will be happy to send you further information on the individual types and designs.

4 / 6 www.belman.com

DN 32 - DN 200 DN 250 - DN 500

DN Length BL

mm

Stiffness rates (average value form full way)

0 bar

N/mm

3240506580

100125150200250300350400500

100100100100100100100100100100100100110110

141412143328308,0422022284446

AXIAL STIFFNESS RATES

1 bar

N/mm

303030457580956890

112108128140172

2,5 bar

N/mm

56566687

135156186144178224236270296354

3 bar

N/mm

62627699

150176218248204256277310342416

6 bar

N/mm

116116142189258320374320370480520570646792

10 bar

N/mm

180180220286396480580528594768854940

10521264

12 bar

N/mm

163163161187172243267292381422447595734866

16 bar

N/mm

264264332414555684819792808

11361338151016602000

25 bar

N/mm

186186184214196278305333435482510679838988

Warning: Deviations (+/-25 %) in the stiffness rates may occur due to use

of different materials and manufactur-ing processes.

BG08/2018 – Subject to alterations and misprints

DN Length BL

mm

Stiffness rates (average value form full way)

0 bar

N/mm

3240506580

100125150200250300350400500

100100100100100100100100100100100100110110

1111172132384548

103126167137187203

LATERAL STIFFNESS RATES

1 bar

N/mm

1717353756778880

155208267263293380

2,5 bar

N/mm

2727476192

112133116221179337385423536

3 bar

N/mm

3030546194

123150123238308400418457573

6 bar

N/mm

45457996

144180225188343442550587633840

10 bar

N/mm

6363

107136204243315265473603750833900

1140

12 bar

N/mm

6868

117150225266348292526659836922996

1249

16 bar

N/mm

7979

138177266312415347633771

1008110011871466

25 bar

N/mm

109109191250376430586489894

10671421156216862029

Warning: Deviations (+/-25 %) in the stiffness rates may occur due to use

of different materials and manufactur-ing processes.

5 / 6 www.belman.com

DN Length

BL

mm

Stiffness torque (averages value from full way)

0 bar

Nm/°

3240506580

100125150200250300350400500

100100100100100100100100100100100100110110

0,10,10,20,30,81,01,60,75,74,05,99,9

19,730,9

ANGULAR STIFFNESS TORQUE

1 bar

Nm/°

0,30,30,40,81,92,95,05,9

12,122,128,845,162,8

115,4

2,5 bar

Nm/°

0,60,60,91,63,45,79,8

12,524,044,362,995,2

132,8237,5

3 bar

Nm/°

0,60,61,01,83,86,4

11,421,527,550,673,8

109,3153,5279,1

6 bar

Nm/°

1,21,21,93,56,5

11,619,627,849,994,9

138,6201,0289,9531,3

10 bar

Nm/°

1,81,82,95,3

10,017,430,445,980,0

151,8227,6331,4472,1848,0

12 bar

Nm/°

1,61,62,13,54,38,8

14,025,351,383,5

119,0209,7329,3580,8

16 bar

Nm/°

2,62,64,47,6

14,024,842,968,8

108,9224,6356,6532,4744,9

1341,7

25 bar

Nm/°

1,81,82,43,94,9

10,116,028,958,695,3

135,8239,4375,8662,9

Warning: Deviations (+/-25 %) in the stiffness torque may occur due to use

of different materials and manufactur-ing processes.

BG08/2018 – Subject to alterations and misprints 6 / 6 www.belman.com

25 bar

Nm/°