Series SPA expansion coupling

Vorwald Pneumatic Expansion Coupling Series SPА

Reliable, Precise, and Lightweight Clamping for Demanding Applications

Vorwald’s Series SPА pneumatic expansion couplings bring a new level of efficiency and handling ease to modern winding applications. Developed with individual expansion ledges, these couplings are built on the proven technology of the Vorwald Series A expansion shafts, offering precision, reliability, and exceptional performance under tough conditions.

Key Design Features

At the heart of the SPА Series lies a rugged, seamless internal bladder engineered for a continuous pressure load of up to 6 bar. This guarantees long-lasting performance even in high-demand environments, such as label printing, converting, and packaging industries.

The unique design of the expansion ledges allows them to move freely within dedicated compartments. This enables smooth and reliable expansion and contraction, making the SPА coupling ideal for rapid core changes and secure clamping in both winding and unwinding directions.

Lightweight Aluminium Construction

The coupling body is made of robust yet lightweight aluminium. This makes handling easier—even with larger diameters—reducing operator fatigue and speeding up changeover times. The simple, modular construction allows for straightforward maintenance and adaptability, while also accommodating larger internal diameters than comparable couplings.

Flexible Mounting Options

Standard SPА couplings are supplied with clamping rings, while flange versions are also available to suit specific application requirements. The take-up bore is manufactured to customer specifications, ensuring a precise fit on winding shafts or rods.

Optional Features

To accommodate various industrial requirements, Vorwald offers several customization options for the SPА Series:

• Surface protection such as nickel plating, anodising, and chrome plating
• Food-grade versions for hygienic applications
• Different expansion ledge materials for tailored performance
• Flange configurations
• Custom dimensions available upon request

Advantages at a Glance

• Rapid changeover between different core diameters
• Lightweight design simplifies handling
• Reliable axial and torque clamping
• Customised bore dimensions
• Suitable for both winding directions
• Cost-effective alternative to mechanical clamping systems

Standard Sizes

The SPА Series is available in the following standard internal diameters:
70 mm, 76 mm, 100 mm, 150 mm, and 152 mm

The Vorwald Series SPА pneumatic expansion coupling combines intelligent engineering with practical handling advantages, making it the ideal solution for industries seeking speed, precision, and durability. Whether in label printing, film winding, or converting processes, the SPА Series delivers proven reliability and flexible clamping with minimal maintenance.