Adjustable pressure reducing valve

The invention relates to the technical field of pressure reducing valves, in particular to an adjustable pressure reducing valve, a first filter plate can clean impurities in a fluid body, the use effect of the pressure reducing valve is guaranteed, the valve body does not need to be dismantled for cleaning, the working efficiency is improved, fluid drives a rotating fan to rotate, and a rotating shaft drives a scraper to rotate; a scraping plate can clean impurities on the surfaces of the first filtering plate and the second filtering plate, filtering holes are prevented from being blocked by the impurities, the discharging efficiency of fluid is guaranteed, the first butterfly plate rotates to seal the inlet cavity, the second butterfly plate rotates along with the first butterfly plate, the U-shaped pipe is opened, and the fluid enters the valve body through the U-shaped pipe; impurities in the inlet cavity enter the U-shaped pipe along with the inlet cavity, then the first rotating shaft is rotated, the i