Valve bellows, Type FV

The type FV bellows can be manufactured with sharp as well as round folds. It can therefore be precisely adapted to specific operating conditions. Round folds are especially well-suited for medium pressure stresses and where good cleanability is stipulated. Sharp folds are better suited for low pressure stresses and high stroke frequencies.
This type of bellows is used mostly as a pump element in dosing pumps, control valves and shut-off valves and in filling lines in chemical and process engineering, in mechanical engineering and in the food industry. The operating temperature ranges between -20 °C to +150 °C.
For increased strength, the bellows head can be manufactured from a more pressure-resistant PTFE compound such as PTFE + glass fiber. Threaded bushings for the securing of spindles can be wound or sintered into the bellows head.

Examples of structural designs

– round folds, with threaded bushing
– with sealing cone

ptfe faltenbalg ventilfaltenbalg produkt bild 02-300x280.

– with sintered stainless steel bushing
– head made of PTFE compound

ptfe faltenbalg ventilfaltenbalg produkt bild 01-300x224.

Materials overview

MaterialsTypical propertiesOperating conditions
CCN-01 (PTFE pure)low gas permeability, universal chemical resistance, good reverse bending strengthstandard material, for food environments
CCN-02 (PTFE modified)very low gas permeability, universal chemical resistancefor enhanced requirements on gas tightness
CCN-03 (PTFE modified)very good reverse bending strength, universal chemical resistancefor higher demands on reverse bending strength
PTFE conductivestatic dissipativefor ATEX requirements (hazard ex. zones), restricted reverse bending strength

Application limits

Pressure: 0,25 to 2/5 bar (abs.) depending on bellows type

Temperature: -20 °C to +150 °C


Please note: The specified application limits affect each other and should not occur simultaneously.

Connection types

Flange connection (standard)


More customer-specific adaptations possible

Get your product quickly!

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.

Discover our product competence.