Device for preventing insufficient carrier gas pressure of pipeline during replacement of carrier gas high-pressure steel cylinder

A device for preventing insufficient carrier gas pressure of a pipeline during replacement of a carrier gas high-pressure steel cylinder is characterized in that a top valve is mounted at the top of the high-pressure steel cylinder, and an inlet of a pressure reducing valve is connected with a carrier gas outlet pipe joint of the high-pressure steel cylinder; an outlet of the pressure reducing valve is communicated with a carrier gas inlet of a gas chromatograph through a first pipeline; one end of a second pipeline is communicated with the first pipeline, the other end of the second pipelineis communicated with the upper portion of a small carrier gas buffer tank, a needle valve is installed on the second pipeline, one end of a third pipeline is communicated with the lower portion of thesmall carrier gas buffer tank, and a valve is installed on the third pipeline. When the high-pressure steel cylinder is replaced, the small carrier gas buffer tank can supply carrier gas with specified pressure to the gas chr