Toilet with selective volume flush

A regulating valve having plural modes of actuation for selecting valve closing time response setting, comprising,

• a. a valve body configured with a seat,
• b. a closure member disposed to sealably engage said seat,
• c. a resilient loading means disposed to sealably engage said closure member with said seat,
• d. a bolt member received in said valve body for being biased to contact and dislodge said closure member from sealing engagement with said seat, thereby opening said valve, said bolt member comprising at least one locking aperture,
• e. buoyantly actuated locking means configured with at least one projection for being engaged in one said locking aperture by elevational biasing,
• f. a pin supported for free elevational movement by said locking means for effecting reversibly removable engagement of said pin with one said locking aperture in said bolt member,
• g. actuating means for alternative rotational and translational biasing of said bolt member to effect operably either non-alignment of both said projection and said pin with one said aperture by rotational biasing thereby to implement immediate closing time response of said regulating valve, or to effect sequential engagement of said pin and said projection with at least one said locking aperture of said bolt member, thereby to implement delayed closing time response of said regulating valve, said sequential engagement being effected first by buoyant upward biasing of said locking means to engage said pin in one said aperture, and then downward gravity biasing of said locking means upon buoyancy being lost to further cause engagement of said projection with one said aperture and then disengagement of said pin by further downward biasing, and finally with recovery of buoyancy, disengagement of said projection thereby freeing said bolt from locking engagement.