Mass transit industry – Accordion Diaphragm
Accordion diaphragm
Pro-Flex Rubber, together with the Centre de Recherche Industrielle du Québec (CRIC) industrial research centre, has tested its diaphragms in climate-controlled chambers. Our field-tested, high-performance diaphragms meet our clients’ requirements. Accordion diaphragms are hand-assembled and sewn with a special Kevlar thread.
1 Corners are compression moulded prior to assembly.
2 Bellows are assembled side by side to create the diaphragm.
3 Car sills are made-to-measure to ensure passenger safety between railway cars.
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Accordion diaphragm – Oversized press
An oversized press is used to mould vertical and horizontal bellows.
Accordion diaphragm – Bellows moulding
Vertical and horizontal bellows are compression moulded for increased resilience.
Accordion diaphragm – Quality control
Stringent quality control is performed to ensure that diaphragms are impermeable.
Accordion diaphragm – Kevlar thread
Pro-Flex’s accordion diaphragms are attached using a special Kevlar thread.
Accordion diaphragm – Climate-controlled chamber
Pro-Flex Rubber, in collaboration with the Centre de Recherche Industrielle du Québec (CRIC) industrial research centre, has conducted cyclic tests in climate-controlled chambers.


ONE-PIECE Accordion diaphragm
View our other specialized public transit products
Face-Plate Diaphragm
Tubular Diaphragm
Connectors, rubber insulations and rubber seals
Mass transit projects
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