Hydraulic system for telescopic screed of paver

The utility model relates to the field of hydraulic element control. The utility model relates to a hydraulic system, in particular to a hydraulic system for a paver telescopic screed. The device comprises an unloading valve flow priority valve (1.1), a leveling valve flow priority valve (1.2), an oil tank (2), an ironing plate lifting valve (3), an anti-creeping valve (4), two ironing plate lifting oil cylinders (7) and an unloading valve group (8), two anti-falling valves (5) and two throttling pieces (6) are respectively arranged on oil paths connected between the lower cavities of the twoscreed plate lifting oil cylinders (7); an oil path connected between the upper cavities of the two screed plate lifting oil cylinders (7) is communicated with the anti-creeping valve (4); technical upgrading can be directly carried out on an existing asphalt paver telescopic screed plate, large-thickness paving of the telescopic screed plate can be directly achieved by arranging the unloading valve set flow priority valv