Patent ID: 7527239
Filing Date: 2009-05-05
Classification: B05B,F16K

Abstract:
1. A control valve assembly for spray guns, comprising a spray gun body whose interior includes a set of fluidly connected water inlet and outlet ducts, a valve chamber for the accommodation of a control valve assembly therein, and a set of first, second, and third apertures formed therein to fluidly connect the water inlet and outlet ducts, and the valve chamber thereby wherein the control valve assembly is composed of an end cover having an accommodating cavity defining therein into which a spring, an actuating valve, a pressure valve having a valve shaft, a flexible valve having a through hole and a water-sealing portion, and a valve seat are sequentially mounted and located therein; the present invention being characterized by that, the flexible valve also having a support surface defining one side of the water-sealing portion thereon and an abutment surface with a pivoting rod disposed at the other side thereon wherein the abutment surface and the pivoting rod thereof are conjoined by a water-stop surface at the adjacent section thereon, and a water-pressure adjusting valve is provided to cooperatively work with the flexible valve thereby; the water-pressure adjusting valve having a pressure-relief section defined by a flow orifice to be mounted to the valve shaft of the pressure valve and matched to the pivoting rod and the abutment surface of the flexible valve thereby; besides, the pressure-relief section is precisely situated between a stop seat of the spray gun body and the valve seat thereof, and a watertight ring is fixed at one side of the pressure-relief section to closely abut against the stop seat thereby; a support section is provided extending at the other side of the water-pressure adjusting valve with a pivoting hole defining the end portion in opposite to the flow orifice thereof; the pressure valve also includes a positioning ring mounted to the predetermined position of the valve shaft thereon; therefore, the support surface and the pivoting rod of the flexible valve are respectively squeezed and pushed by the pressure valve and the positioning ring thereof so as to accurately control the flow orifice and the water-stop surface of the flexible valve closely abutted against or detached there-from for the shutoff or discharge of water supply thereby; furthermore, the water-pressure control valve can efficiently buffer the water pressure generated at the instant of water discharge via the pressure-relief section and guide the water current via the flow orifice thereof so as to maintain the balance of water pressure within the interior of the spray gun body and ensure a smooth discharge of the water supply thereby.