SHUTOFF DEVICE FOR LAVATORY PAN FLUSHING TANK Russian patent published in 2006 - IPC E03D1/34 

FIELD: sanitary equipment, particularly shutoff mechanisms for lavatory pans.

SUBSTANCE: shutoff device comprises body with perforated orifices made in lower body part, lid, neck and seat made in bottom part and adapted for annular discharge valve receiving, discharge valve and movable overflow pipe provided with retaining unit, which fixes the overflow pipe during discharge operation. The retaining unit is installed in neck and lid so that annular gaps are created in-between. Discharge valve is provided with orifices located out of neck closure zone, which permit water passage inside the body during flushing tank filling with water and is connected to compensating guiding bush along larger diameter thereof. The compensating guiding bush is installed inside the body and has height providing necessary clearance for water discharge from flushing tank into neck through above perforation body orifices. Dividing pipe is secured to inner lid surface and spaced from overflow pipe and from neck. The dividing pipe is provided with perforation orifices located in upper part thereof and is adapted to fill the body with water during flushing tank filling. Overflow pipe has annular extension to close the gap between lid and overflow pipe at the end of working overflow pipe travel. Overflow pipe also comprises valve, which closes gap between overflow pipe and dividing pipe after retaining unit activation during discharge operation.

EFFECT: increased efficiency of water usage due to optimized water discharge, increased structural simplicity.

1 dwg