Is the pressure of the toilet foot valve water dependent on the compressed air in the cavity? Find o

There is a valve core that moves up and down in the valve body, and the valve core has two materials, cast copper and plastic, which is composed of a pressure relief rod, a water inlet, a pressurization pinhole, and an upper and lower sealing rubber ring. In the usual state, the water pressure in the lower rubber ring and the valve body water cavity plus the gravity of the valve core work together to make the lower rubber ring and the water outlet seal to block the waterway, after the person steps on the pedal, the valve core pressure relief rod deviates from the axis 3 5 degrees of inclination angle, the flushing port is communicated with the valve body water cavity, at this time, at the moment when the static pressure on the upper part of the valve body water cavity is released, the pressure in the cavity is equal to the atmospheric pressure, the water pressure in the pipeline pushes the valve core to move up, and the pipeline water communicates with the water outlet to form a larger water flow and complete the flushing action. At the same time of flushing, the valve core moves up, the rubber ring on the valve core is sealed with the upper water cavity, and the pipeline water supplies water to the pressurized water cavity through the 1 mm pressurized water inlet pinhole behind the filter screen of the valve core water inlet, and with the increase of water pressure in the upper water cavity, the valve core is forced to move down, and the rubber ring under the valve core seals the water outlet to achieve the purpose of time delay.