Patent ID: 8397747

Claim:
A balanced water-intake control valve comprising: a valve having a water channel, the valve including an upper valve base and a lower valve base; a valve rod movably disposed inside the valve, the valve rod including a valve stopper for sealing the water channel of the valve and a linkage hole, a portion of the valve rod comprising the linkage hole guided within the lower valve base; a first linkage rod pivotably connected to the lower valve base and passing through the linkage hole for driving the valve rod; a second linkage rod pivotably connected to the upper valve base; a float body connected to the second linkage rod; and a water-level adjusting mechanism, comprising: a first pivot guide pivotably connected to the first linkage rod, the first linkage rod engaging the valve rod at a location on the first linkage rod that is between a pivot point with the lower valve base and a pivot point with the first pivot guide; a second pivot guide pivotably connected to the second linkage rod; a lead screw with ends respectively screwing to the first pivot guide and to the second pivot guide; an adjusting nut placed in a middle portion of the lead screw to rotate the lead screw to change a distance between the first pivot guide and the second pivot guide, the lead screw having a clockwise screw portion screwing to one of the first pivot guide and the second pivot guide, and a counterclockwise screw portion screwing to the other one of the first pivot guide and the second pivot guide; a first constraining nut engaged on the lead screw between the first pivot guide and the adjusting nut; and a second constraining nut engaged on the lead screw between the second pivot guide and the adjusting nut.