Automatic control valve for flow of automobile hydraulic steering system

The invention discloses an automatic control valve for flow of an automobile hydraulic steering system. A main valve cavity used for installing a main valve is formed in a valve body. The main valve arranged in the main valve cavity can axially move. An elastically compressed reset spring is arranged between one end of the main valve and the inner end face of the main valve cavity. The valve bodyis further provided with a main channel connected with the main valve cavity and a main valve ring groove formed in the outer circumferential face of the main valve. The main channel is connected withan electromagnetic reversing valve through a pipeline. The electromagnetic reversing valve is connected with the two ends of a double-acting oil cylinder through pipelines in a communication manner.A pipeline is arranged in the electromagnetic reversing valve and is connected with an oil tank, and hydraulic oil in the main channel is conveyed to the oil tank. A control channel in the valve bodyis connected with the main c