AWWA/ANSI 250Psi Non-Rising Stem Resilient Seated Gate Valve 设计标准Design: AWWA C515/C509 结构长Face to Face: ANSI B 16.10 法兰标准 Flanges: ASME B 16.42 阀体Body: 球铁ASTM A536 65-45-12 ; 闸板Wedge: 球铁 DL+EPDM
