throttle gate screw 节流阀限位螺钉

screw gate 螺旋机舱门

screw gate jack 螺旋机门油缸

screw gate valve 螺旋闸阀

screw gate lifting device 螺旋式闸门启门机

INSIDE SCREW WEDGE GATE VALVES 暗杆楔式闸阀

ROLLBALL SCREW GATE VALVE 滚珠丝杠式平行闸板阀

Aerating screw gate 充气螺旋闸门

manual gate-adjustment screw 手动闸门调节螺旋