Diaphragm valves don’t have gland seal. External sealing is ensured by thin metal discs (diaphragms) ensuring hermetic sealing of the area through which the fluid flows.
The materials used for the main parts are: • ST-UNI EN 12165 – CW 617N hot-forged brass for the body and the cap; • nylon for the seat sealing gasket; • harmonic steel for the spring.