LIQUID LEVEL CONTROLLER AND ITS FINAL CONTROL ELEMENT Russian patent published in 2003 - IPC

FIELD: off-line water supplies. SUBSTANCE: automatic liquid level control device designed to maintain constant liquid level in for service tanks without using auxiliary energy sources has service tank accommodating storage flask for keeping expendable liquid that has leak-proof top part and is provided with outlet and inlet holes made on its bottom and lateral surface, respectively. Outlet hole is disposed below desired liquid level and inlet one, above this level. Flask may be made of transparent plastic bottle with screw-top having vent hole on its bottom. Outlet hole is made on lateral surface of bottle neck. Bottle is mounted within service tank in vertical or almost vertical position. Liquid level controller may be provided with glass attached to flask (bottle). In this case outlet and inlet holes are disposed on floor and on lateral surface of this glass, respectively. Controller is made of standard easy-to-get interchangeable parts. EFFECT: simplified design, facilitated servicing of controller. 4 cl, 3 dwg, 1 tbl