Rubber Diaphragms

Molded Elastomeric Diaphragms are tough, versatile dynamic seals that eliminate virtually all of the limitations associated with other sealing methods like U-cups, O-rings, metal bellows and flat die-cut diaphragms. They can withstand pressures to 6,000 psi (4.137 bar) over a temperature range from -76°F to 626°F (-60°C to 330°C). We currently manufacture diaphragms ranging in size from 0.1969" to 29.1339" (5 mm to 740 mm).

Inseal is dedicated to providing diaphragm seals that enhance the performance and appeal of your product at a price point that helps you compete. Our engineering department stands ready to provide product design support that is both timely and comprehensive.

Molded Diaphragm Advantages

• Best No Leak Seal
• No Lubrication
• Low Friction
• Low Hysteresis
• No Spring Rate
• No Break Away Friction
• Long Cycle Life
• Effective In Harsh Environments
• Constant Effective Pressure Area
• Low Assembly/Hardware Costs
• Exceptional Sensitivity
• Ability to Operate Under Severe Pressure

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PTFE is one of the most chemically inert compounds, however, has very little elasticity, which can reduce flow rates upto 20%. A rubber back-up diaphragm is required to provide flexibility and memory. Many other materials, usually derivates of the above, have been developed by individual pump companies for use in their own pumps.

These PTFE protected diaphragms combine the chemical resistance associated with PTFE with the flex characteristics of an elastomer. The PTFE is chemically bound to the underlying rubber. Since it is manufactured as one piece, the risk of separation normally associated with two-piece overlaid diaphragms is eliminated, increasing time on-line. One-piece construction avoids the possibility of leakage and also prevents abrasive particulate material getting between the PTFE and rubber, which could cause damage and lead to reduced diaphragm lifetime.

We supply a wide range of PTFE lined rubber diaphragms which are used in all kinds of valves, pumps and actuators used in critical corrosive applications. The rubber used with PTFE linings are Neoprene, EPDM and Butyle.

Our sizes range from 12mm to 900mm diameter in various shapes as per clients requirements.

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