... and equipments. It will open and close automatically by the pressure of medium. When the medium is back-going, valve disc ... avoid accidents.1. Tightly sealed, without leakage under the water pressure testing.2. Economical, light weight, compact design-significantly lighter and less ... . Easy to install and maintain.Performance:Nominal Diameter: DN40-DN1200Nominal Pressure PN (MPa):1.0, 1.6, 2.0, 2. ...