Tank pressure control system

The utility model discloses a tank body pressure control system, and belongs to the technical field of storage tank tower pressure control. The device comprises a water seal device, a water seal storage tank is arranged at the top of the water seal device, the bottom of the water seal storage tank penetrates into the water seal device, a movable installation table is fixedly connected to the bottom of the water seal device, and a liquid injection pipe is communicated with the bottom of the back face of the water seal storage tank. A self-adjusting air flow dividing valve assembly is movably installed in the water seal storage tank. According to the utility model, the liquid injection pipe and the GAS pressure-equalizing adjusting port enable the water seal storage tank to reach an internal saturation state, then the GAS pressure-equalizing inlet and the self-adjusting air diverter valve assembly adjust the pressure when a liquid medium is output, and then the GAS pressure-equalizing adjusting port and the pre