Goyen BW series 2/2 normally open solenoid valve

The BW series use a floating diaphragm to provide the seal for tthe main orifice. The pressuree within the valve is utilised to open and close the diaphragm. A small pressure drop across the main orifice is required to keep the diaphragm in the open position. When the solenoid is energised, the fluid pressure closes the diaphragm.