Gate Valve   Wafer_type Butterfly Valve-2 Specification: working pressure: 1.6 MPa body test pressure: 2.4 MPa seat test pressure: 1.6 MPa diameter: 200--1000mm materials:   body ,disc     ductile or grey cast iron stem Gr13 seatrings brass or stainless steel discrings: rubber packing: soft graphite or rubber Wafer_type Butterfly Valve-3 Specification: class: 125,150,Lb body test pressure: 2.4 3.0 MPa seat test pressure: 1.5 2.2 MPa diameter: 50--1000mm materials:   body ,disc     ductile or grey cast iron stem Gr13 seatrings brass or stainless steel discrings: rubber packing: soft graphite or rubber       Air Relief Valve Double Chamber Air Relif Valve-1 Specification: working pressure: 1.0 1.6 MPa body test pressure: 1.5 2.4 MPa seat test pressure: 1.0 1.6 MPa diameter: 50--200mm materials:   body ,disc     ductile or grey cast iron stem Gr13 seatrings brass or stainless steel discrings: rubber packing: soft graphite or rubber       Double Chamber Air Relif Valve-2 Specification: working pressure: 1.0 1.6 MPa body test pressure: 1.5 2.4 MPa seat test pressure: 1.0 1.6 MPa diameter: 50--200mm materials:   body ,disc     ductile or grey cast iron stem Gr13 seatrings brass or stainless steel discrings: rubber packing: soft graphite or rubber       Quick Air Relief Valve Specification: working pressure: 1.0 1.6 MPa body test pressure: 1.5 2.4 MPa seat test pressure: 1.0 1.6 MPa diameter: 50--200mm materials:   body ,disc     ductile or grey cast iron seatrings brass or stainless steel floating tub Gr13