Diaphragm Production

RPP is committed to providing high quality, cost effective solutions for all your diaphragm requirements. With a 45,000 square foot manufacturing facility located north of Boston Massachusetts, 100 compression molding presses and over 125 employees, RPP has the capacity, equipment and talent to take your project from engineering concept to production deliveries. Customers also benefit from RPP’s in-house machine shop for quick turnaround on new or additional diaphragm molds.

Large Diaphragms

RPP is your very large diaphragm source. Utilizing some of the largest compression molding presses available in the industry, RPP can manufacture diaphragms up to 46 inches (1.168 meters) in diameter and up to 15 inches (381 mm) tall. Our equipment, combined with our materials and molding knowledge, enable us to make large diaphragms with challenging height to bore ratios, and meeting high pressure and heat requirements.

Diaphragm Designs

RPP’s technical team has decades of experience assisting customers with diaphragm designs focused on performance, quality, manufacturability and cost. From customer requirements, to diaphragm designs and design validation, RPP is there to help customers develop the best diaphragms while avoiding costly mistakes. RPP continually reviews mold design techniques and advancements in elastomers and fabrics to ensure customers can take advantage of new technologies and new material capabilities.

Diaphragm Elastomers & Fabrics

RPP uses a wide variety of standard and propriety elastomers and fabrics. Along with Nitrile, RPP regularly produces diaphragms utilizing challenging compounds such as EPDM, Viton, AFLAS, FFKM, Saturated Nitrile, and Silicone and fabrics like Nylon, Polyester and high temperature / high strength materials such as Nomex and Vectran. Working with customers and suppliers, our materials group is continually developing cost competitive, higher performing diaphragm elastomers and fabrics.

Worldwide Distribution

With customers in over 30 countries on six continents, RPP has the experience and know-how to provide technical support and quality diaphragms to all parts of the globe. Our global reach was acknowledged in 2013 as RPP was awarded The President’s “E-Award” for Exporting for making a significant contribution to the expansion of U.S. Exports.

Diaphragms for Nuclear Power Industry

Diaphragms for Nuclear Power Industry RPP is the leading supplier of diaphragm seals for control valves going into the power generation industry. RPP manufactures some of its largest diaphragms for the nuclear power industry in accordance with 10CFR50 Appendix B regulations. RPP has a Certified Material Option that includes a comprehensive program of testing and documenting processes related to the tested physical characteristics of commercial grade material used in “safety related applications”.

RPP Corporation is a world-class manufacturer of diaphragm seals.  Supplying industrial users around the globe since 1963, RPP diaphragms are used in a variety of applications such as valve actuators, gas regulators, irrigation control valves, pneumatic valves, dispensing systems, air brakes and any number of other applications requiring dynamic, leak-proof sealing.  RPP specializes in molding custom, single and double coated, fabric reinforced diaphragm seals in challenging configurations such as rolling “Top Hats”, convoluted, offset convoluted, and double acting dish styles. 

Selecting and specifying the diaphragm seal that will provide maximum performance and the longest possible service life calls for a degree of expertise gained only through years of experience in diaphragm seal design and application.  RPP’s technical team averages over 25 years of experience in the art and science of diaphragm seals.  Customers often see them as an extension of their own engineering staffs.  To have RPP be your resource for diaphragm seals or for more information, please call us at +1-800-232-2239.


Contact Us