Explore the selection of diaphragm valves at F.W. Webb. A diaphragm valve includes a flexible elastomeric membrane and a valve body that work together to control the flow of liquids and gasses in various applications, including corrosive, food processing, chemical, water, or pharmaceutical systems. Made in PVC, EPDM, CPVC, or polypropylene, these valves are resilient, corrosion-resistant, and can withstand indoor or outdoor use for extended periods. Use our helpful filters to sort valves by end connection, seal material, size, and other factors. Browse top-quality diaphragm valves from trusted makers to find the best fit for your needs.