Below is a list of Sanitary Diaphragm Valves manufacturers from Napa, California. Sanitary diaphragm valves are process flow regulation devices constructed of sterile materials and designed to create an aseptic environment for liquid, gaseous and semi-solid material flows. Like all diaphragm valves, these mechanisms use a membrane made of elastomeric polymers to stop, start and modify the flow and pressure of process streams for a number industrial and commercial manufacturing applications.