The Rolling Diaphragm Concept

What are Rolling Diaphragm Air Cylinders?

Because they do not exhibit sliding friction and operate with zero leakage, rolling-diaphragm air cylinders offer advantages not found in other linear actuators.

Rolling Diaphragm Air Cylinders are made from fabric reinforced elastomer diaphragms which seal the space between the piston and the cylinder I.D. Due to the rolling action, the seal is accomplished without creating friction.

Pneumatic Cylinders

Why use Rolling Diaphragm Cylinders?

Piston and rod seal friction in conventional air cylinders can cause positioning from stick-slip motion at low speeds or pressures. These seals also wear over time, which makes it difficult to hold position without drift. Both of these conditions can be avoided by specifying rolling-diaphragm air cylinders, which have no dynamic seals to cause friction, wear, and leakage.

Rolling Diaphragm cylinders provide virtually frictionless conversion of pneumatic pressure to linear force and offer the following features:

  • High Sensitivity

  • No Line Lubrication

  • Low Hysteresis

  • No Blow-By Leakage

  • Wide Temperature Variations

Dancer Cylinder Diagram

Common Applications and Solutions

Rolling Diaphragm Air Cylinders are replacing conventionally sealed cylinders and actuators where low friction and reliability are requirements.
They are designed for use with dry filtered non-lubricated pressure systems.

The low friction characteristics of diaphragm cylinders make them ideally suited to web tensioning, positioning, braking, valve actuation, and other engineered applications.

  • Web Tension Control

  • Braking Applications

  • Valve Actuation

  • Precise Force Control Applications

  • Printing

  • Packaging

  • Animation & Robotics

Get A Custom Quote

Illinois Pneumatics Diaphragm Air Cylinders offer low-friction dynamic sealing by way of long stroke rolling diaphragm technology.

Get virtually frictionless conversion of pneumatic pressure to linear force!

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Contact Info

Phone: 815-654-9301
Fax: 815-654-9426


9201 Starboard Dr. Roscoe, IL 61073
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