Advanced dual-flush valve

A toilet flush valve, comprising:

• a shuttle having a first position associated with a first flush volume and a second position associated with a second flush volume less than the first flush volume;
• portions of the shuttle defining a hole;
• a button assembly operable to move the shuttle between the first position associated with the first flush volume and the second position associated with the second flush volume;
• a first button included in the button assembly and operable to move a first cam surface into the hole to move the shuttle to the first position associated with the first flush volume;
• a second button included in the button assembly and operable to move a second cam surface into the hole to move the shuttle to the second position associated with the second flush volume;
• a deflection member included in the portions defining the hole, the deflection member being deflectable to enlarge the hole and prevent binding of the button assembly when the first button and the second button are operated to move the first cam surface and the second cam surface into the hole substantially simultaneously.

A flush valve assembly adapted for use in toilet tank having a bottom and a top separated by a particular height, comprising:

• a base structure adapted for mounting relative to the bottom of the tank;
• a top structure coupled to the base structure and adapted for mounting relative to the top of the tank;
• a float assembly having a height and being carried between the base structure and the top structure;
• first means for adjusting the distance separating the base structure and the top structure to provide the flush valve with a height generally equivalent to the particular height of the tank;
• and
• second means for adjusting the height of the float assembly in accordance with the adjustment of the first means.