Adjustable hydraulic pressing device for visualization of oil sprayer

The utility model relates to an adjustable hydraulic pressing device for visualization of an oil sprayer. The adjustable hydraulic pressing device comprises a sprayer, a needle valve, a transparent nozzle, a hydraulic part, an upper flange and a lower flange. The top face of the transparent nozzle is attached to the bottom end of the spray head, the needle valve is installed in the spray head, and the end of the needle valve protrudes out of the spray head and is located in the transparent nozzle. The sprayer and the transparent nozzle are fixed to the upper flange and the lower flange respectively, the upper flange and the lower flange are fixedly connected, and a hydraulic part of the hydraulic part abuts against the bottom end of the transparent nozzle. According to the adjustable hydraulic pressing device for visualization of the oil sprayer, by positioning the transparent nozzle and applying the hydraulic part to adjust the pre-tightening force according to the fuel injection pressure, it is guaranteed t