Quality is designed into the Series 42 (wafer) and 44 (lug) butterfly valves, utilizing the phenolic-backed cartridge seat pioneered by Crane.

• 系列42（平板）和系列44（吊耳）蝶阀贯彻“质量第一”设计原则，采用美国克雷恩首创的酚醛制成的衬套阀座。