Patent ID: 7028702

Claim:
An automatic water pressure control valve balancing the temperature of mixed water of the present invention, comprising: a main body including: a hot water inlet and a cold water inlet, bent and facing each other; a piston spacer within the main body connected with the hot and the cold water inlets, wherein one end of the piston spacer has the same diameter with the other end of the piston spacer; a separation hole in the center of the piston spacer; a first spacer in one side of the piston spacer, storing a predetermined quantity of hot water; a second spacer in the other side of the piston spacer, storing a predetermined quantity of cold water; a transition opening between the piston spacer and the first spacer, having slightly smaller diameter than the piston spacer; a cap hole prolonged to the piston spacer via the second spacer to have slightly longer diameter than the piston spacer, comprising a female screw on the outer side of the second spacer and a transition step in one side of the piston spacer; a hot water outlet connected with the first spacer; and a cold water outlet connected with the second spacer; a piston, insertable through the female screw, the second spacer, and the separation hole of the main body sequentially, including: a sealing moveable only within and against the separation hole; a hot water tube in one side of the sealing, connected with the first spacer, including a hot water hole opened or closed selectively to the hot water inlet; and a coldwater tube in the other side of the sealing, connected with the second spacer, including a cold water hole opened or closed selectively to the cold water inlet; wherein one end of the piston is contacted with the transition opening of the piston spacer having a boundary with the first spacer; the length of the piston is slightly less than the length of the piston spacer; and the outer circumference of the sealing includes a ring groove placing a seal ring; and a cap penetrating the cap hole in one side of the main body to contact with the transition step in one side of the piston spacer, including: an inlet tube in the extremity of the cap, connected with the piston spacer; a separation hole perpendicular to the inlet tube, connected with the second spacer; a male screw in the outer circumference of the inlet tube adjacent to a cap head, corresponding to the female screw of the main body.