Product category:
Seals
News Release from: Freudenberg Simrit LP | Subject: Custom diaphragms
Edited by the Engineeringtalk Editorial
Team on 18 October 2004
Novel diaphragm design reduces pump
running costs
A special multilayer diaphragm designed for an international pump manufacturer has greatly increased the service life of the company's compressed air double diaphragm pumps.
The requirements on double diaphragm pumps are increasing In many systems and processes these all-rounders are also used for tricky problems where the diaphragm is subject to high stress levels
This article was originally published on Engineeringtalk on 10 Mar 2005 at 8.00am (UK)
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In such applications an optimised design of diaphragm can offer major savings in terms of operating costs.
One topical example is the development of a special multilayer diaphragm for compressed air double diaphragm pumps of an international pump manufacturer, which has greatly increased the service life.
A new diaphragm has been developed for an existing series of pneumatically operated double diaphragm pumps.
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Cover Seal is a one-piece double-acting polyurethane compact seal designed to provide static sealing for rods and pistons in hydraulic or pneumatic systems at operating pressure levels abovve 5MPa.
Complete piston cuts down on parts
According to Freudenberg, the pneumatic complete piston Pneuko M sets new standards in terms of durability and frictional behaviour.
The objective was to cater for the constantly growing requirements of pump operators for an optimised service life, thus minimising lifecycle costs.
The new pump diaphragm has first been brought into line with state-of-the-art technology in terms of its form and optimised by means of calculations.
The widespread traditional dished shape has now been replaced by a tension-optimised convoluted form.
With this form of diaphragm the stresses occurring in the different work cycles are minimised.
The roll characteristics of the diaphragm are also greatly improved with this form.
Besides the constructional changes, a new diaphragm structure has contributed to the decisive improvements.
The side of the pump diaphragm in contact with the medium consists of a universal media-resistant PTFE layer.
The following elastomer layer is equipped with two fabric layers with a defined position.
One of these fabric layers ensures high levels of strength close to the boundary layer to the PTFE.
On the side of the diaphragm away from the medium the second layer of fabric protects the diaphragm from overloading.
In the centre of the diaphragm there is a metal insert permanently attached to the elastomer for mechanical control.
The significant increase in service life for this pump diaphragm has been achieved by the tension-optimised convoluted form.
The position of each fabric layer in the diaphragm structure is of prime importance for a perfect combination of function and long-term stability.
Besides engineering to ensure an optimised design structure for this innovative diaphragm, controlled production is of prime importance for quality and long service life.
Up to nine different components are combined during the manufacture of diaphragms.
In a special press process these different components are compressed under negative pressure and brought into form.
The diaphragm design realised here for the first time provides for very thin layers.
In close co-operation with the pump manufacturer Simrit has developed a diaphragm that has been optimised in terms of contour and structure so that its service life can be calculated under specific load populations.
These new high-performance diaphragms mean that such double diaphragm pumps can now offer significantly longer service life levels.
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