An actuation control for a flush system includes a cartridge valve being actuated between an opened position and a closed position to compete a flushing cycle. The cartridge valve includes a cartridge housing having a valve inlet for communicating with a water source and the valve outlet for guiding water to flow to the flush system, and a control disc unit which is supported in the cartridge housing at the valve inlet thereof and is orientated perpendicular to a water-in direction of the water for biasing against water pressure from said water source. At the closed position, the valve inlet is closed by the control disc unit for blocking the water to pass through the valve inlet. At the opened position, the valve inlet is opened up for allowing the water passing to the valve outlet so as to complete the flushing cycle of the flush system.