The present invention relates to a pressure regulator installed on a city gas pipe to regulate gas pressure or to cut off gas pressure. When the city gas supply is cut off by the pressure regulator, the pressure is returned to the original position to resume the supply of gas. A city gas pressure regulator to which a control valve is attached.;In particular, the present invention is installed on the city gas pipe line in the constant pressure regulator to cut off the city gas supply in the event of an accident on the city gas pipeline, a gas pressure regulator for reducing the pressure of the gas and safety to automatically shut off the gas supply in an emergency In the positive pressure device composed of a shut-off device (SSV), the through-holes through which the gas flows into the orifice of the valve body to which the safety shut-off device and the gas pressure regulator is attached, the through hole is connected to the flow path connected to the primary side flow path, A pressure regulating valve is installed in the flow passage so that the pressure port protrudes out of the valve body, and the pressure port opens the air passage formed in the valve body through the primary side flow path of the valve body and the orifice, and the high pressure gas pressure of the primary flow path is opened by the push hole. It flows into the low pressure orifice and raises the pressure in the orifice to return the valve of the safety shut-off device to its original position. As soon it relates to a city gas having a pressure control valve for return to the valve of the gas regulator to its original position simultaneously ever resume the supply of the gas governor.
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