暗杆闸阀 inside screw non-rising stem type gate valve ; non rising stem ; Inside screw nonrising stem type gate valve

黑暗的闸门 The Gate of Darkness

暗杆楔式闸阀 non-rising stem wedge sluice valve ; non-rising stem wedge gate valve ; INSIDE SCREW WEDGE GATE VALVES

电动暗杆刀闸阀 DDDXZF

暗杆楔式单闸板闸阀 Non Rising Stem Single

气动暗杆式刀形闸阀 QDZF

暗杆式铸铁闸门 AYZ