What are Diaphragm Cylinders?

By Completely Blogger | January 25, 2019

What are Diaphragm Cylinders?

Diaphragm cylinders are great at providing frictionless conversion of the typical pneumatic pressure common in most power systems to linear force.

Sensitivity, accuracy, and repeatability are ensured by lack of stiction or blow-by.

The stroke rolling diaphragm was invented to facilitate low-friction dynamic sealing and has given rise to diaphragm cylinders. The main reason to use rolling diaphragm cylinders is that they do not portray sliding friction but also operate without any leakage. They also have a couple of other advantages typically not present in other common linear actuators.

diaphragm cylinders

More About Diaphragm Cylinders?

Conventional air cylinders have piston and rod-seal friction that could result in positioning from stick-slip movement even at low pressures or speeds.

Wear and tear also tend to affect these seals over time.

This makes it challenging to hold position without possible drift. To avoid both of these conditions, you might have to specify your rolling-diaphragm cylinders, which lack dynamic seals that could result in wear, tear, friction, and leakage. Rather, a positive seal may have to be placed around the piston, and it should not undergo sliding motion or should not leak over the life course of the actuator. Some cylinders are rated to perform on plant air pressure that could go up to 145 psi at 40 degrees to 225 degrees Fahrenheit range.

However, with custom diaphragm materials, cylinders can exhibit operational performance at temperatures ranging from -75 degrees to 400 degrees Fahrenheit.

While some standard forms of cylinders are designed for air service, some changes or modifications can be performed to help handle liquid pressurised or hydraulic applications.

How about the opening and closing of doors . . .

Hydraulic systems have been the first choice when it comes to closing and opening very large doors, such as one-piece doors on airplane hangars and agricultural structures or buildings of 100ft or more in width and 10, 000 lb or more in weight.

The efficient opening and closing of these doors greatly depend on the successful implementation of powerful mechanisms that allows smooth and dependable operations.

In this regard, the use of hydraulic power should be adaptable to the ideal size of the door or any other component that needs to be operated. The diaphragm cylinders are often increased in size to correspond to the size and weight of the door to be moved, opened, or closed. They make the operation very simple and can help to open very large one-piece doors in some of the most sophisticated buildings or structures.


Hydraulic cylinders and actuators have proven to be very useful in providing the strength required to open or close very large doors, especially those of commercial, industrial, agricultural, and even residential buildings.

The popularity of diaphragm cylinders has been attributed to their ability to seamlessly convert pneumatic pressure to typical linear force.

The features and specifications of these cylinders greatly determine their effectiveness or reliability. Not everyone has the technical know-how regarding the best component to choose.

However, having a reliable technician or engineer can help you make the right decision. There are several professional technicians and engineers in Kent, Essex, Heathrow, and London and can help you with making the right choice.

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