Installed to be connected to the water inflow pipe to be connected to the [problem] in the water level adjustment mass was buried in the field It is to provide a stepless level adjustment cylinder which adjusts the level of paddy by performing the drainage and supply of water for stepless. A plug large diameter annular member second member 1, the water level adjustment slide the small-diameter annular member 4 of the short tube 3, outflow in hole section 7 of the comings and goings member 6 in the water level adjustment slide tube, and a threaded portion 8 cap nut 9 is set to the lowermost position of the adjusting tube 10. From such a state, when loosen the cap nut 9 to release the engagement with the threaded portion 8, it is possible to vertical movement of the comings and goings member 6, and pulled up and out member 6 to the uppermost end, in the water level adjustment slide tube stopper members it is possible to raise the water control slide short pipe 3 engaged with telescoping the stepped portion of the small-diameter annular member 4. Since thereby the height position of the outlet in hole 7 can be controlled, it is possible to perform the level adjustment steplessly.BACKGROUND 1【課題】圃場に埋設した水位調整枡内に連接する用水流入パイプに接続して設置され、無段階で用水の排水および供給を行うことで田面の水位を調整する無段階水位調整筒を提供する。【解決手段】差し込み部材1の大径環状部材2、水位調整スライド短管3の小径環状部材4、水位調整スライド中管の出入り部材6の流出入孔部7、ネジ部8および袋ナット9が調節管10の最下端位置に設定されている。このような状態から、袋ナット9を緩めてネジ部8との螺合を解除すると、出入り部材6の上下動が可能となり、出入り部材6を最上端まで引き上げると、水位調整スライド中管のストッパー部材が小径環状部材4の段部に係合してテレスコープ式に水調整スライド短管3を引き上げることができる。それによって流出入孔部7の高さ位置がコントロールできるので、水位調整を無段階に行うことができる。【選択図】図1
