Flush Valve Assembly

Abstract

A flush valve assembly for a siphonic flush toilet, comprising a flush valve body and a flapper cover, wherein the flush valve body is coupled to an overflow tube or is coupled to an overflow tube coupling configured to receive an overflow tube, the flapper cover is configured to rotatably lift off the flush valve inlet at an open angle in a direction towards the overflow tube or the overflow tube coupling, and at least one of the flapper cover top face, the overflow tube, and the overflow tube coupling comprises a stop component configured to determine the flapper cover open angle during a flush cycle.

1 . A flush valve assembly for a siphonic flush toilet, comprising
 a flush valve body extending from a valve inlet to a valve outlet; and   a flapper cover configured to enclose and seal the valve inlet between flush cycles,   wherein   the flapper cover comprises a top face and a bottom face, the bottom face configured to enclose and seal the valve inlet,   the flush valve body is coupled to an overflow tube or is coupled to an overflow tube coupling configured to receive an overflow tube,   the flapper cover is configured to rotatably lift off the flush valve inlet to allow toilet tank flush water to pass through the valve body to a toilet bowl to perform a flush during the flush cycle,   the flapper cover is configured to rotatable lift off the flush valve inlet at an open angle in a direction towards the overflow tube or the overflow tube coupling, and   at least one of the flapper cover top face, the overflow tube, and the overflow tube coupling comprises a stop component having a stop configured to determine the flapper cover open angle during the flush cycle.   
     
     
         2 . The flush valve assembly according to  claim 1 , wherein the open angle is determinate of a flush valve open time during the flush cycle, and is determinate of a flush water volume delivered through the valve body during the flush cycle. 
     
     
         3 . The flush valve assembly according to  claim 1 , wherein the stop component comprises a plurality of stops. 
     
     
         4 . The flush valve assembly according to  claim 1 , wherein the stop component is adjustable, such that the flapper cover open angle is adjustable. 
     
     
         5 . The flush valve assembly according to  claim 4 , wherein the stop component is rotatably or vertically adjustable. 
     
     
         6 . The flush valve assembly according to  claim 4 , wherein the stop component is slidably adjustable. 
     
     
         7 . The flush valve assembly according to  claim 1 , wherein the stop component comprises a cam shape. 
     
     
         8 . The flush valve assembly according to  claim 1 , wherein the stop component comprises one or more radial coupling elements configured to prevent rotational movement of the stop component during use. 
     
     
         9 . The flush valve assembly according to  claim 1 , wherein the stop component comprises one or more vertical coupling elements configured to prevent vertical movement of the stop component during use. 
     
     
         10 . The flush valve assembly according to  claim 1 , wherein the stop component comprises one or more lateral coupling elements configured to prevent lateral movement of the stop component during use. 
     
     
         11 . The flush valve assembly according to  claim 1 , wherein the flapper cover top face is coupled to the stop component. 
     
     
         12 . The flush valve assembly according to  claim 1 , wherein the overflow tube coupling is coupled the stop component. 
     
     
         13 . The flush valve assembly according to  claim 1 , wherein the overflow tube is coupled to the stop component. 
     
     
         14 . The flush valve assembly according to  claim 1 , wherein the stop component comprises a single molded part configured to couple to the flapper cover top face, to the overflow tube, or to the overflow tube coupling. 
     
     
         15 . The flush valve assembly according to  claim 1 , wherein the stop component comprises two or more molded parts, wherein a first stop component part is configured to be coupled to the flapper cover top face, the overflow tube, or the overflow tube coupling, and a second stop component part is configured to be coupled to the first stop component part. 
     
     
         16 . The flush valve assembly according to  claim 15 , wherein the first stop component part comprises an annular ring shape, and is configured to couple to the overflow tube or the overflow tube coupling, and the second stop component part comprises the stop. 
     
     
         17 . The flush valve assembly according to  claim 1 , wherein the stop component comprises a feature configured to prevent an end-user from removing or adjusting it. 
     
     
         18 . The flush valve assembly according to  claim 1 , wherein the stop component is configured to be adjustable by an end-user. 
     
     
         19 . The flush valve assembly according to  claim 1 , comprising a set of stop components, wherein each individual stop component of the set is configured to couple to the flapper cover top face, the overflow tube, or the overflow tube coupling, and each individual stop component is determinate of the open angle. 
     
     
         20 . A flapper cover, an overflow tube, or an overflow tube coupling comprising the stop component according to  claim 1 .