https://www.conval.com/
High-Performance Valves - Conval, Inc.
high performance valvesconvalinc
https://www.slb.com/zh-cn/valves/butterfly-valves/high-performance-butterfly-wkm-valves
WKM High-Performance Butterfly Valves | SLB
Sealing performance of a ball or gate valve but in a much smaller profile.
high performancebutterfly valveswkmslb