As an important parameter in industrial production,flow is one of the most difficult parameters to meas-ure accurately because of its dynamic and unstable characteristics.According to JJG 164-2000"Liquid flow stand-ard Device"verification regulation,its stability is an important index to measure the uncertainty of liquid standard device.In order to improve the metering performance of the device,this paper mainly analyzes the factors affecting the stability of small flow from the outlet pressure of the device,the roughness of the pipe wall,the cleanliness of the water dissolved gas and the medium in the pipeline,and makes a feasible transformation plan such as installing a secondary pressure regulator,replacing the material of the pipeline,adding the exhaust valve and the impurity fil-ter device.
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