Product category:
Seals
News Release from: Freudenberg Simrit LP | Subject: Diaphragms for Flotronic AODD pumps
Edited by the Engineeringtalk Editorial
Team on 18 June 2004
Novel design produces longer-life
diaphragm
By developing a special multilayer diaphragm for Flotronic air-driven double diaphragm pumps, Freudenberg reckons it has succeeded in significantly increasing the service life of the pumps.
The demands made on double diaphragm pumps are constantly increasing These all-rounders are used in many plants and processes - even for difficult applications
This article was originally published on Engineeringtalk on 18 Feb 2003 at 8.00am (UK)
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One weak point of this type of pump is the diaphragm itself, which is prone to wear, leading to increased operating costs.
By developing a special multilayer diaphragm for Flotronic air-driven double diaphragm pumps, Freudenberg reckons it has succeeded in significantly increasing the service life of the pumps.
The first step was to adapt the shape of the pump diaphragm to bring it up to the state of the art and then to optimise it on the basis of calculations.
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Seals can be adapted for individual applications
Freudenberg has succeeded in developing a Simmerring for industrial applications which combines the properties of both PTFE and elastomer materials.
This involved replacing the traditional diaphragm disk shape, which is in widespread use, with a stress-optimised bead shape.
The loads that are exerted on this diaphragm shape in the course of the various cycles are lower than for any other diaphragm shape.
It also brought about a significant improvement in the moving characteristics of the diaphragms.
In addition to structural changes, a new diaphragm design also contributed to the all-round improvements.
The side of the pump diaphragm that comes in contact with the media is coated with a layer of universally media-resistant PTFE.
The elastomer layer on top of this features carefully positioned fabric layers.
One fabric layer ensures high strength.
On the side that faces away from the medium, a further fabric layer protects the diaphragm from overload.
A metallic insert for mechanical control, which is securely attached to the elastomer, is situated in the centre of the diaphragm.
The key to the significant extension of the service life of these pump diaphragms is the stress-optimised bead shape.
The position of the fabric layers in the diaphragm structure is another central feature of the design that combines function and long-time stability.
But it was not only engineering that ensured the optimised structure of this innovative diaphragm: the process-reliable production procedure also has a major influence on the product's high quality and long service life.
The production process brings together up to nine different components, which are then pressed together and formed in a vacuum.
The all-new high-performance diaphragm notches up millions of strokes when used in Flotronic double diaphragm pumps.
This means a dramatic increase in service life over existing diaphragms.
With up to 150 strokes per minute, double diaphragm pumps have a capacity of up to 120 litre/min.
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