鏈條節數M=0.105×-113（×是絲桿中心離地面高度）距地面小于1.7米用于手輪大于1.7米用鏈輪 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-雙向 LMD two-way
Ⅱ-鏈條 II chain
注：可來圖來樣定作非標的螺旋閘門 Note: Non-standard screw gate valve could be customized based on drawing or sample.
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