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promise accuracy, functionality
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diaphragms for cryogenic valves
Rubber Diaphragms

Rubber Diaphragms

Rubber diaphragms function as flexible barriers between two chambers, preventing the movement of fluids or contaminants from one chamber to another. They may be static or dynamic rubber seals. Western Rubbers is a leading manufacturer of PTFE and rubber diaphragms with a global distribution network.
Diaphragms are used in a range of industries across the globe in assemblies of pumps, valves and actuators to regulate the flow and transfer of fluids.

Why Choose Western Rubbers for Rubber Diaphragms

In-House Tooling & Compounding
  • All dies custom fabricated in-house
  • Quick turnaround time
Extensive Product Capability
  • Sizes range from ¼” to 55” diameter
  • Specific elastomers can be used to withstand extremes of temperatures (-100C to +300C)
  • Fabric reinforcements can also be used to withstand pressures up to 1000 psi (68 bar)
OEM Replacement Parts
  • OEM replacement parts manufacturer for Wilden, Warren Rupp., Versamatic, Saunders, George Fisher, Blagdon and Samson Controls.
  • Superior grade selection & in-house processing ensures our diaphragms have the best flex life in the industry
  • Reasonably priced compared to OEM and we also offer significant cost reduction on bulk purchasing
Customer Satisfaction
  • Complete guidance throughout the process from prototyping to dispatch
  • Fast turnaround on quotations, prototypes, repeat orders, etc.
  • All parts are 100% quality tested

Materials used for Manufacturing Rubber Diaphragms


Western Rubbers manufactures diaphragms in a range of elastomers like Silicone, EPDM, FKM, Nitrile, etc. Each elastomer comes with its unique properties. And hence, depending upon the application, Western Rubbers’ engineers offer guidance in selecting the most appropriate elastomer.

Polytetrafluoroethylene (PTFE)

PTFE belongs to the fluoroplastics family. It is highly chemically inert. And hence, offers excellent chemical resistant properties in some of the most corrosive environments. It can withstand temperatures up to 260 C.

Rubber Diaphragms Classification

Fabric Reinforced Diaphragm
Fabric Reinforced Diaphragm

Fabric reinforced diaphragms have a layer of fabric sandwiched between two elastomer layers. The fabric enables the diaphragm to withstand higher pressures, while offering flexible movements during the process.

Homogeneous Rubber Diaphragm
Rubber Diaphragm

Rubber diaphragms, also known as homogeneous diaphragms, are similar to fabric reinforced diaphragms, except without the layer of fabric reinforcement. They are preferred for low pressure applications.

Insert Molded Diaphragm
Insert Molded Diaphragm

These diaphragms have plastic or metal inserts bonded into the diaphragm. During the molding
process, the insert is completely or partially inserted into the elastomeric layers, thus creating a strong bond between the two. This helps eliminate the costs incurred for assembling the diaphragm in pumps or valves.

Laminated Diaphragm
Laminated Diaphragm

Laminated diaphragms have a PTFE sheet bonded with rubber. The PTFE layer offers resistance against corrosive chemicals, thereby increasing the life of the diaphragm. These diaphragms are cheaper in cost compared to PTFE diaphragms.

Molded Die Cut Diaphragm
Molded Die Cut Diaphragm

Molded die cut diaphragms can be made available in any shape or size. They are cut molded from rubber sheets. They can be made with or without a fabric reinforced layer.

PTFE Diaphragm
PTFE Diaphragm

PTFE belongs to the fluoroplastics family. It is highly chemically inert. And hence, offers excellent chemical resistant properties in some of the most corrosive environments. It can withstand temperatures up to 260 C.


Western Rubbers diaphragms are used in all pumping industries in fluid transfer. Diaphragms have critical roles to play in Air Operated Double Diaphragm Pumps (AODD) and Pneumatic Pumps


Diaphragms in valves are used to stop/start/control the fluid flow. Unlike pumps, diaphragms in valves are not used to transfer fluids.


Rolling diaphragms, pneumatic actuator diaphragms are some types that assist in pressure transfer, which in turn controls the motion of the piston. Hence diaphragms have a critical role to play in actuator systems.

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