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Diaphragm actuators

Learn more about Diaphragm actuators
Bellow cylinders

Bellow cylinders

Size 80, 100, 145, 165, 215, 250, 325, 385 mm

Stroke length 60 ... 230 mm

Force 0 ... 70000 N

Bellow cylinder: actuator and pneumatic spring elements for harsh, dusty environments or for use under water

Rolling bellows with large stroke range in relation to the height.

Pneumatic muscle

Pneumatic muscle

Size 10, 20, 40 mm

Nominal length 40 ... 9000 mm

Stroke force 480 ... 6000 N

Screw connection

Pressed connection

Pneumatic actuator without piston rod, with contracting diaphragm, dynamic, powerful, stick-slip-free, single-acting pulling.

As a tensile actuator modelled on a biological muscle, with almost linear force-stroke characteristics

Selection Guide

Selection Guide

Bellows and diaphragm actuators

Bellow cylinder

Bellows cylinders function both as driving and pneumatic spring components and fall under the category of diaphragm actuators. The pneumatic actuator does not have a piston rod, but the simple design consists of two metal plates with a ribbed rubber bellows. The large force is generated directly by the pressure on a relatively large surface of the end faces. A spring return is not required, as the return is usually effected by the weight of the load. A major advantage of bellows cylinders is their particularly low installation height compared to cylinders and their ease of movement.
This means that larger axis offsets and angular rotations of up to 20° are also possible. The stick-slip effect, which is often a problem with conventional cylinders, also does not occur with bellow cylinders. Double bellows are intended for larger strokes.
They can be used with various media such as compressed air, gases, and liquids if the properties of the rubber are taken into account.
Festo bellows cylinders are the right solution for many applications in pneumatic actuator technology. They are available with diameters from 80 mm to 385 mm. Strokes of up to 230 mm are possible with these products. The max. load bearing capacity at 8 bar is 70 kN.

Pneumatic muscle

The fluidic muscle is a diaphragm contraction system, or to put it more simply, a tube that contracts under pressure. This innovation is based on a tensile material consisting of a flexible tube reinforced with fibres in the form of a rhomboidal mesh. The usable tensile force is at its maximum at the start of the contraction and then decreases in a virtually linear manner as a function of the stroke.
Clamping: under cramped conditions, Fluidic Muscle can deliver significantly higher clamping force than a conventional cylinder. Friction-free and without leaks.
Vibrating and shaking: Fluidic Muscle can vibrate and shake at both low and high frequencies. Amplitude and frequency can be adjusted independently of each other.
Pneumatic spring: Fluidic Muscle is an energy-efficient pneumatic spring. Its motion is always friction-free, even under extreme dynamic loads. Spring force can be adjusted via pressure.