Wafer Butterfly-type Check Valves 250PSI/300PSI

        Introduction
        The valve can be used on pipe line through which water <= 80C
        or other non-corrosive medium to prevent back flow.
        Inspection Pressure:  250PSI:  Shell: 500PSI Seal: 250PSI
                              300PSI:  Shell: 600PSI Seal: 300PSI
        Surface:              Coating: Akzo Nobel Fusion Bonded 
                              Epoxy Coating with thickness 150-500um, 
                              Complies with ANSI/AWWA C550
        Applications:         To prevent the medium regorging and 
                              diminish noises of potable water, water 
                              supply and drainage, sewage disposal, 
                              irrigation and fire protection pipe 
                              system, etc.