KF Formed Bellows

KF Formed Bellows provide a flexible, vacuum-tight connection between ISO-KF vacuum components while allowing limited axial, lateral, and angular movements. Their formed stainless steel bellows construction accommodates mechanical displacement, thermal expansion, and minor installation misalignments within vacuum assemblies.

Manufactured from high-quality stainless steel, the bellows offer a robust, all-metal construction with low outgassing characteristics for vacuum and high-vacuum applications. The corrugated geometry provides flexibility while maintaining a continuous metallic vacuum boundary.

Equipped with standard ISO-KF (QF / NW) flange connections, the bellows can be integrated into existing vacuum systems using conventional KF clamps and centring rings with O-ring seals.

Available in stainless steel 1.4301 (AISI 304) and 1.4404 (AISI 316L), providing material options for different vacuum system requirements.

Technical Specifications

Flange Sizes: DN10, DN16, DN25, DN40, DN50 KF

Materials: Stainless Steel 1.4301 (AISI 304), Stainless Steel 1.4404 (AISI 316L)

Flange Connection: ISO-KF (QF / NW)

Configuration: Formed stainless steel bellows with KF flange connections

Design: Flexible, corrugated metal bellows

Movement Capability: Axial, lateral, and angular movement within the manufacturer's specified limits

Sealing: Compatible KF centring rings with elastomer O-ring seals

Applications

Suitable for vacuum chambers, vacuum pumps, vacuum manifolds, laboratory vacuum equipment, and industrial vacuum systems requiring flexible connections or mechanical movement compensation.

Formed bellows are particularly useful for accommodating thermal expansion, compensating minor installation misalignments, and mechanically decoupling connected vacuum components.

Installation and Compatibility

Compatible with standard ISO-KF flange connections of the corresponding nominal size. Each connection requires a suitable KF centring ring with O-ring seal and a KF clamp.

Compatible KF Centring Rings & Seals and KF Clamps are available separately.

For flexible vacuum piping connections, the KF Flexible Hose is also available.

The permissible axial compression, extension, lateral displacement, and angular deflection depend on the bellows dimensions and design. The manufacturer's specified movement limits and minimum bending requirements must be observed to avoid damage or premature fatigue.

The achievable vacuum pressure and operating temperature depend on the selected sealing components and operating conditions