Amiad Filtration Systems offers a complete line of "no spring" Raphael control valves. Available in 2 inch to 12 inch sizes, these valves can be used as basic on/off valves or as pressure regulating valves. They are designed with only three major components - body, diaphragm and cover - with no springs to slip or wear out. The diaphragm is designed to prevent the formation of trapped air, and operates under various pressures. Raphael valves provide a wide range of applications and can be controlled manually or by remote control (hydraulic or electric). Amiad Filtration Systems