Patent ID: 7367351

Claim:
A tap pressure balance valve includes a case comprised of a primary case and a secondary case incorporated to each other; a balance diaphragm and a balance valve in each chamber of the primary and the secondary cases; a deck to contact a water control valve extending from the top of the primary case; a first water outlet penetrating through the chamber of the primary case being provided on the deck; a second water outlet penetrating through the secondary case where it is to be combined with the primary case being assembled to the secondary case; and a through hole being disposed in the secondary case in relation with the first water outlet on the deck from the primary case; the through hole passing through the chamber of the secondary case to connect the second water outlet; the top of the through hole of the secondary case including a flared section to contain a coil spring and a cut-off washer; the coil spring pushing against the cut-off washer to achieve watertight status between the cut-off washer and a bottom of the deck of the primary case once the secondary case is assembled to the primary case at a pre-selected location; whereby seepage from the interface between the primary and the secondary cases is prevented to maintain normal operation of the tap pressure balance valve; wherein a gap exists between a top of the secondary case and a bottom of the deck of the primary case, and the coil spring pushes against the cut-off washer.