Stoppable flushing mechanism with assured minimal flow

A stoppable flushing mechanism having an assured minimum flow capable of dispensing two levels of water from a flushing tank of a toilet, comprising:

• means defining an evacuation orifice including a sealing edge and, adapted to be positioned in a base of said flushing tank, for permitting water to be evacuated from the flushing tank;
• a housing defining a substantially vertical axis and having an upper portion and a lower portion defined by a partition;
• a valve movable in a direction substantially along said substantially vertical axis for displaceably contacting said sealing edge;
• a floater movable in a direction substantially along said substantially vertical axis, said floater being affixed to said valve and adapted to maintain said valve at a distance from said sealing edge during evacuation of water from the flushing tank;
• a transmission and lifting system for moving said valve from a position on said sealing edge;
• a push-button control device for activating said transmission and lifting system;
• a buoyancy chamber having a first base, said buoyancy chamber being positioned in said upper portion of said housing and said floater being positioned within said buoyancy chamber;
• and
• a rapid evacuation mechanism for rapidly evacuating said buoyancy chamber, comprising at least one element activatable by said push-button control device, and at least one first orifice in a vicinity of said first base of said buoyancy chamber, said at least one element being placed in an operative position to permit rapid flow of water from said buoyancy chamber through said at least one first orifice when said push-button control device is pressed and water in the flushing tank is at a level below said at least one first orifice, thus allowing said floater to descend causing said valve to close, retaining a portion of said water in said tank, and in an operative position to stop rapid flow of water from said buoyancy chamber when said push-button control device is no longer pressed.