Sound velocity nozzle gas flow standard device nozzle one way leakproofness detects structure

The utility model provides a sound velocity nozzle gas flow standard device nozzle one way leakproofness detects structure. When mainly having solved present flow rate standard facility appearance leakage, need the problem of pulling down all injector sets. The utility model provides a sound velocity nozzle gas flow standard device nozzle one way leakproofness detects structure, including the nozzle and the connecting pipe that are linked together, the connecting pipe upper end is equipped with the sealing plug, the sealing plug bottom be equipped with with sealed pad of the sealed complex of connecting pipe, be equipped with the annular groove on connecting pipe and the sealed sealed face that fills up, be equipped with on the connecting pipe circumference wall with the intake pipe be connected with the air supply of being used for of annular groove intercommunication, the intake pipe still is connected with manometer and ooff valve. Can let in gas through the intake pipe, then close the ooff valve, through