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Rolling Diaphragm

A rolling diaphragm is an elastomeric element that seals between a piston and cylinder through a "rolling" action, with no sliding friction. The core principle: the diaphragm rolls along the cylinder wall, maintaining constant effective area throughout the entire stroke, enabling zero-friction, zero-hysteresis, and zero-leakage precision control. Product range includes fabric-reinforced rubber, PTFE perfluoroelastomer, and custom-engineered solutions, with materials covering NBR, FKM, EPDM, VMQ, CR, HNBR, and reinforcement fabrics including nylon, polyester, fiberglass, or aramid.

product details

Product Features

1. Rolling action
Rolling contact between diaphragm and cylinder wall, no sliding friction, no lubrication required, zero breakaway friction

2. Constant effective area
Effective area remains unchanged throughout stroke; output force is precisely linear to control pressure

3. Long stroke
Deep convolution design allows stroke up to 1/2 of diaphragm effective length, far exceeding conventional diaphragms

4. Zero leakage
No sliding seal bypass leakage; only minimal media permeation.

5. Self-centering
Pressure automatically generates centering recovery force, eliminating need for precision-machined piston/cylinder fits.

6. Wide pressure range
Compatible from 250 Pa to 9.81 MPa (approximately 1,400 psi)

7. Diameter
Up to 2,000 mm.

Product Specifications

7. Diameter
Up to 2,000 mm. e883f2884e8c1440fedae06d394619d3 1541d539b1f295903ad9f892013f71cb

Application

Advantages

● Zero friction
Rolling action eliminates sliding friction, no lubrication required, zero breakaway friction, minimal hysteresis

● Constant effective area
Linear force-to-pressure ratio, consistent throughout stroke, high control accuracy.

● Long stroke & long life
Stroke far exceeds conventional diaphragms; rolling action produces no wear, extremely long cycle life

● Zero leakage
No sliding seal bypass leakage, only media permeation.

● Wide pressure range
250 Pa to 9.81 MPa, suitable from ultra-low to high pressure.

● Flexible customization
Diameters up to 2,000 mm, multiple elastomer/reinforcement fabric/mounting configurations available.

Manufacturing Standards

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FAQ

1. Why can a rolling diaphragm achieve zero leakage?

A rolling diaphragm has no bypass leakage path at the sliding seal interface. Fluid can only permeate through the rubber membrane (in extremely small amounts), rather than leaking through the sealing interface—effectively achieving zero-leakage sealing.
2. How much pressure can a rolling diaphragm withstand?

Fabric-reinforced rolling diaphragms can withstand pressures up to 9.81 MPa (approximately 1,400 psi), with special designs reaching up to 6,000 psi. Pressure capacity depends on the strength grade of the fabric reinforcement layer and the convolution width of the diaphragm.
3. What is the service life of a rolling diaphragm?

A properly installed rolling diaphragm can achieve millions of cycles. The rolling action produces no sliding friction, resulting in extremely low wear. Primary factors affecting service life include operating pressure, stroke frequency, media temperature, and hardware surface finish (recommended ≤32 µin roughness).
4. How do I select the right material and size for my application?

Material selection is based on three primary factors: operating temperature range, media chemical compatibility, and working pressure. The elastomer (NBR/FKM/EPDM/VMQ) provides chemical isolation and sealing; the fabric reinforcement layer (nylon/polyester/fiberglass/aramid) provides tensile strength. Dimensional parameters include cylinder bore, stroke length, and mounting configuration (peripheral bead fixing / threaded insert fixing / clamped unbonded fixing), with maximum diameter up to 2,000 mm.

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PTFE Membrane