Bellows with round folds, Type FR

The bellows type FR with round folds are manufactured by machine cutting. It is characterized by a high stiffness and permits only short strokes. This makes it especially well-suited for medium pressure stresses.

The advantages of this bellows type are the stable walls and very good cleanability. Horizontal and vertical installation are both possible. Very frequent connection types are flange connections, screw threads and ball/ball sockets. Further connections with customer-specified adaptions are also possible.

Areas of applications are expansion and vibration compensation between pipelines, protection of spindles and rods in corrosive atmospheres and in fluid streams. This bellows type is therefore used mainly in chemical and process engineering, in mechanical engineering and in the food and pharmaceutical industry. The operating temperature ranges between -120 °C to +150 °C.

Examples of structural forms

Round folds, two-sided flange connection

Round / angular folds, First side: Flange connection
Other side: TriClamp connection

Materials overview

MaterialsTypical propertiesOperating conditions
(PTFE pure)
low gas permeability, universal chemical resistance, good reverse bending strengtstandard material, for food environments
(PTFE modified)
very low gas permeability, universal chemical resistancefor enhanced requirements on gas tightness and surface finish
(PTFE modified)
very low gas permeability, universal chemical resistancefor enhanced requirements on reverse bending strength
PTFE conductivestatic dissipative propertiesfor ATEX requirements (ex areas), restricted reverse bending strength

Hinweis: Die angegebenen Einsatzgrenzen stehen in Abhängigkeit zueinander und dürfen nicht gleichzeitig auftreten.

Application limits

Pressure: 0,25 to 5 bar (abs.)

Temperature: -120 °C to +150 °C

Further customer-specific adaptions are possible.

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We have prepared a technical questionnaire to help you order the right bellows you need quickly.

In this questionnaire you can note your specifications and requirements and send it to us directly ( We will also be glad to send you the form per e-mail. In this case, please contact our staff. We are happy to provide advice, if you have any questions.

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