High-precision two-stage stable pressure reducing valve

The utility model relates to the technical field of pressure reducing valves, in particular to a high-precision two-stage stable pressure reducing valve which comprises a valve body, an input pipeline is connected to one side of the valve body, a combined sleeve is embedded in the input pipeline, and a first screen is arranged in the center of the interior of the combined sleeve. Through the arrangement of the combined sleeve, the second screen, the first screen, the third screen, the conical disc, the auxiliary flange plate and the center connecting rod, when gas or fluid enters the input end of the whole pressure reducing valve, the pressure reducing valve is closed; the second screen, the first screen and the third screen which are different in density from left to right can play a certain role in pre-screening gas or fluid entering the input end, and impurities and dirt can be pre-screened from the interior of the input end of the whole pressure reducing valve; and certain pollution to the interior of the