The valve body is made of grey cast iron.The disc and seat are made of copper alloy;the pin axis and internal screws use stainless steel;and the sealing spacer uses Buna-N rubber.

• 阀体材料为灰口铸铁，阀瓣、座圈采用铜合金材料，销轴及内部螺钉等采用不锈钢材料，密封垫片采用丁腈橡胶。