Features and Benefits Automatic control valve, running by itself. One complete combined disc, easy for maintenance. Diaphragm type; quick response against pressure change. Relieving pressure can be adjusted. Once Pipeline system pressure less than the discharge pressure, valve will be switch off quickly. Applicable Standards Flange standard: BS EN 1092-2 Face to face standard: EN558 Series10 Technical Data Nominal Diameter:DN50~DN400(2"~16") Nominal pressure: PN 16 Temperature range: -5C ~ +85C Sealing test: 1.1PN Shell test: 1.5PN Suitable for: Water, ethylene glycol, non correction medium, etc.