The invention provides a
helium medium valve sealing performance test device and a test method thereof. The device comprises a high-pressure
helium cylinder and a high-pressure
nitrogen cylinder, wherein the outlet ends of the high-pressure
helium cylinder and the high-pressure
nitrogen cylinder are respectively connected with the inlet ends of a first
needle type adjusting valve and a second
needle type adjusting valve through pipelines; the outlet end pipelines of the first
needle type adjusting valve and the second needle type adjusting valve are converged and then connected with the air inlet end of a clamp; the air outlet end pipeline of the clamp is divided into two branches, wherein one
branch is connected with the air inlet end of a detection valve; the air outlet end of the detection valve is connected with a detection port through the pipeline, and the other
branch is connected with the air inlet end of a pressure
relief valve; the air outlet end of the pressure relief valveis connected with a pressure relief port through the pipeline; and when the sealing performance test is performed, the cleanliness of a helium medium valve is firstly checked, then the air inlet end of the clamp is connected with the outlet end of the high-pressure
nitrogen cylinder or the high-pressure
helium cylinder through the first needle type adjusting valve and the second needle type adjusting valve, and nitrogen or helium is filled in the helium medium valve to perform pre-detection and internal sealing and external sealing detection. The helium medium valve sealing performance test device has the advantages of being reasonable in structure, convenient to assemble, easy to operate and high in practicality.