... through welding 焊透 through-conduit valve 贯穿流通闸阀 through-flowline pump-down pro-duction tool 过出油管泵送采油工具 ...
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... 支撑筋或者柱support ribs or legs 直通阀through-conduit valve 双座、双向阀twin-seat，both seatsbi-directional，valve ...
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through conduit gate valve 直通型闸阀 ; 纵贯型闸阀 ; 通过导管闸阀 ; 疏通型闸阀
through conduit ghad valve 直通型闸阀
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