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ASEPCO Diaphragms: Silicone, EPDM, Silicone Plus, EPDM Plus, Viton, and PTFE

Patented Weirless Radial-Diaphragm™ Valve Design

DiaphragmsFeatures & BenefitsSpecificationsFree Diaphragm ReportDatasheet & Resources
ASEPCO Diaphragm Family Picture
The ASEPCO patented valve architecture (US Patent #5152500) includes a unique radial diaphragm that forms three seals with the valve: the seal at the inlet, a seal with the compound shoulder, and an o-ring seal at the bottom of the valve chamber. A behind-the-seat flow path allows complete flushing of the valve chamber. The result is a superb aseptic design that promotes self-draining and easy cleaning. Diaphragm replacement is done with a hygienic clamp that never needs adjusting—no tools are required for maintenance and no bolts need to be periodically tightened with a torque wrench. The result is that our customers see significantly reduced maintenance costs over standard weir valves—some as much as an 80% reduction. ASEPCO diaphragms come in a variety of materials (Silicone, EPDM, Silicone Plus, EPDM Plus, Viton, and PTFE) so that you can select the material that can best suit your specific application. ASEPCO is continually exploring new materials for aseptic diaphragms—but we limit our experiments to the lab. We do not release any materials to our customers until we are convinced that they will always seal in the environments they are designed for. We will be introducing new materials as they prove themselves worthy of the ASEPCO name.
Diaphragm in cutaway of valve with callouts pointing out the 3 seals
  • All diaphragms meet USP VI standards and are FDA CFR 177.2600 compliant
  • Valve assembles with hygienic clamp and no tools
  • Three seals formed with valve body
  • Behind-the-seat flow path
  • Meets the standards for quality, purity, lack of toxicity, strength, and consistency
  • Suitable for biomedical/pharma applications
  • Diaphragm can be changed extremely quickly with little training
  • No need for re-torquing after use
  • Minimizes contamination and dead legs
  • Allows complete flushing of the valve chamber
ASEPCO provides diaphragms created with a number of different materials. The materials vary with respect to heat-resistance, chemical-resistance, steam-resistance, and durability. The table below shows basic compatibility information. Do not use this information as your sole method for determining whether an elastomer is right for your specific process. Before using any elastomer in a process you should verify its compatibility with an elastomer expert.

Diaphragm specifications and availability tables


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For a printable version of this web page that includes the product information, features & benefits, specifications, and illustrations, download the PDF.

pdf-download-icon ASEPCO Diaphragms Datasheet

We specialize in customization. Please contact our Customer Service Department for any non-standard product requirement (800) 882-3886.