A Specification:DN50-DN400 B Brief introduction to the product:   Handwheel drive;flanged connection,with red epoxy coating applied on the surface;the valve disc is rubber-clad and beset with bronze nuts.The product is applied to fire fighting system. C Materials   Valve body/valve cap:Cast iron/ ductile iron   Valve disc:Ductile iron coated with rubber   Valve stem:2Cr13 D Pressure and temperature   Working pressure:1.0MPa / 1.6MPa /2.5 MPa   Working temperature: 0 º C-80 º C