The QH-D series two position electric switching valve has a switching service life of up to 1 million times at room temperature, and the switching valve can withstand high temperatures of 200 ℃, which can replace imported products. Used for driving and controlling the two position switching valves (such as six way valves, eight way valves, ten way valves, etc.) used in gas chromatographs, such as sampling of sample gases; Quantitative injection; Air circuit switching and other instruments and equipment with similar requirements.