Self-closing valve for sanitary installations

A self-closing valve assembly for sanitary installations comprising:

• upper and lower valve housings coupled in a watertight seal to define between them, a metering chamber, normally filled with water as a metering fluid, the inner walls of which are lined with a plastic sleeve;
• a metering means, shiftably mounted in said lower valve housing, including a first and second one-way valve means, said first one-way valve means is operably mounted in said metering chamber and displaces a predetermined volume of said metering fluid when said valve assembly is in its opened position;
• said metering means includes a valve pin shiftably mounted in said lower housing, the upper end of which is disposed in said metering chamber, said upper end of said valve pin, having operably coupled thereto, said first and second one-way valve means, said valve pin having axial and transverse passageways formed therein, and which communicate with said metering chamber at said one end of said valve pin;
• said first one-way valve means having a cup seal, positioned in said metering chamber, mounted to said upper end of said valve pin, said cup seal having a periphery made of resilient, deformable material to permit metering fluid to flow therearound when said first one-way valve means is shifted in said metering chamber from its closed to its opened position;
• an actuating assembly comprising a handle and surrounding a portion of said upper valve housing, to shift said metering means from its normally closed, inoperative position to its open, operative position;
• said actuating assembly including time adjusting means operably coupled to said upper housing portion within said handle to preset the distance said metering means is shifted so that a predetermined volume of said metering fluid is displaced in said metering chamber by said first one-way valve means;
• closure means, including said second one-way valve means, operably coupled to said metering means to automatically shift said metering means from its opened to its normally closed position;
• said second one-way valve means including a cone valve mounted to said lower housing and positioned in a corresponding conical valve seat formed in said axial passageway of said lower housing, said cone valve and said conical recess having a spiral passageway of constant cross sectional area which is in fluid communication with said metering chamber and said axial and transverse passageways whereby said displaced volume of said metering fluid is transferred at a constant rate said metering chamber after a predetermined period of time has elapsed when said first one-way valve means is shifted from its open to its close position in said metering chamber, to thereby automatically close said valve assembly.