链条节数M=0.105×-113（×是丝杆中心离地面高度）距地面小于1.7米用于手轮大于1.7米用链轮 Number of chain nodes M = 0.105×-113 (× means the distance of lead screw center from surface); use hand wheel if the height is less than 1.7 m; use chain wheel if the height is more than 1.7 m.
LMD-双向 LMD two-way
Ⅱ-链条 II chain
注：可来图来样定作非标的螺旋闸门 Note: Non-standard screw gate valve could be customized based on drawing or sample.
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