Casing pressure compensator

The utility model relates to a sleeve pipe pressure compensator, which comprises the sleeve pipe with a joint head pipe and a compensating pipe which is extended into a proper position of the sleeve pipe, wherein, a steel check ring, a flexible disc root and a pressing sleeve are arranged in sequence between the sleeve pipe and the compensating pipe from the compensating pipe extending to the most deep position of the sleeve pipe to the edge of the outer part of the sleeve pipe. On the outer part of the sleeve pipe corresponding to the part, a spring disk, a wing disk and a pressing disk are orderly provided with proper intervals and are fixed by bolts; an anti-thrust pipe is also arranged between the spring disk and the wing disk, and a spring is arranged outside the anti-thrust pipe. The utility model has the advantages of novel structure and reasonable design. The utility model can be widely installed on technology producing pipelines for hot water, steam, and various heat medium. The utility model has the advantages of large compensation, flexible expansion and contraction, simple structure, small size, convenient manufacture, low cost, long service life, etc.