Diaphragm Air Cylinders
Standard Cylinders
Super Cylinders
Small Bore Cylinders
Diaphragm Air Cylinder Repair Kits
Diaphragm Air Cylinder Accessories
Diaphragm Air Cylinders for Smooth, Reliable Linear Actuation
Bellofram Precision Controls offers a versatile range of diaphragm air cylinders designed to provide smooth, responsive linear force for industrial and OEM pneumatic applications. Unlike conventional piston-style cylinders, Bellofram diaphragm cylinders use flexible, reinforced diaphragms to provide virtually frictionless actuation without requiring cylinder lubrication.
Available configurations include single-acting and double-acting standard cylinders, low-friction Super Cylinders, and compact small-bore diaphragm cylinders. Multiple equivalent bore sizes, stroke lengths, mounting options, and accessories allow engineers to match cylinder performance to the force, movement, and installation requirements of the application.
Bellofram diaphragm air cylinders can be used for lifting, clamping, pushing, positioning, turning, valve actuation, web tensioning, expansion chambers, shock absorption, and other applications requiring controlled linear motion. Repair kits and mounting accessories are also available to support installation and ongoing service.
Why Choose Bellofram Diaphragm Air Cylinders?
Low-Friction Operation: The flexible diaphragm design provides smooth movement with very little mechanical friction, making diaphragm cylinders well suited for applications where sensitivity and repeatable actuation are important.
No Cylinder Lubrication Required: Bellofram diaphragm air cylinders do not rely on sliding piston seals for operation and require no cylinder lubrication, helping simplify pneumatic system maintenance.
Single- and Double-Acting Options: Standard cylinders are available in spring-return single-acting and double-acting configurations to accommodate different actuation and return requirements.
Multiple Sizes and Stroke Lengths: A range of equivalent bore diameters and stroke options allows cylinder force and travel to be matched to the application.
High-Sensitivity Options: Bellofram Super Cylinders combine the diaphragm-cylinder design with linear ball bearings and hardened steel rods to further reduce friction in applications requiring increased sensitivity.
Compact Small-Bore Designs: Small-bore diaphragm cylinders provide the operating characteristics of a diaphragm actuator in a compact package for applications where installation space is limited.
Find the Right Diaphragm Air Cylinder
Selecting the appropriate pneumatic diaphragm cylinder depends on required force, supply pressure, stroke length, equivalent bore diameter, single- or double-acting operation, mounting method, available installation space, temperature, and the motion requirements of the equipment.
Explore the Bellofram diaphragm air cylinders above to compare standard, Super, and small-bore configurations, along with available repair kits and mounting accessories. Bellofram Precision Controls can also assist with identifying a cylinder configuration for specialized OEM or industrial applications.
Diaphragm Air Cylinder FAQs
What is a diaphragm air cylinder?
A diaphragm air cylinder is a pneumatic actuator that uses compressed air acting against a flexible diaphragm to generate linear force and motion. The diaphragm design minimizes sliding friction and provides smooth, responsive actuation for industrial and OEM equipment.
How is a diaphragm air cylinder different from a piston air cylinder?
A conventional piston cylinder typically uses sliding seals between the piston and cylinder bore. A diaphragm air cylinder uses a flexible diaphragm to transfer pneumatic pressure into linear force, reducing the sliding friction associated with piston seals. This makes diaphragm cylinders useful in applications requiring sensitive or smooth movement.
Do Bellofram diaphragm air cylinders require lubrication?
Bellofram diaphragm air cylinders do not require cylinder lubrication. Their diaphragm-based actuation design provides virtually frictionless operation without relying on lubricated sliding piston seals.
What is the difference between single-acting and double-acting diaphragm cylinders?
A single-acting diaphragm cylinder uses air pressure to create motion in one direction and a spring to return the cylinder when pressure is released. A double-acting diaphragm cylinder uses pneumatic pressure to control movement in both directions.
What is a Bellofram Super Cylinder?
Bellofram Super Cylinders are spring-return diaphragm cylinders equipped with linear ball bearings and hardened steel rods. This design further reduces mechanical friction and is intended for applications where maximum sensitivity is important.
What are small-bore diaphragm cylinders used for?
Small-bore diaphragm cylinders provide diaphragm-actuator performance in a compact package. They are useful when installation space is limited or when an application requires lower force and a smaller actuator footprint.
What applications use diaphragm air cylinders?
Diaphragm air cylinders can be used for lifting, clamping, pushing, positioning, turning, valve actuation, web tensioning, expansion chambers, shock absorption, and other applications requiring controlled pneumatic linear force or movement.
How do I select the correct diaphragm air cylinder?
Selection should consider required force, available air pressure, stroke length, equivalent bore diameter, single- or double-acting operation, mounting configuration, temperature range, available space, and the motion requirements of the application.
Are repair kits available for Bellofram diaphragm air cylinders?
Yes. Bellofram offers repair kits for standard single-acting, double-acting, and Super diaphragm cylinders. Available cylinder accessories also include mounting brackets, flange mounts, clevis components, rod clevis kits, and breather vents.
