Abstract: A regenerative heat exchanger includes first and second parts. The first part is essentially cylindrical, includes a regenerative mass, and is rotatable in relation to the second part around a common center axis. The second part includes axially directed inlets and outlets for heat emitting and heat absorbing media. The inlets and outlets of the second part are mutually separated by sector shaped plates for sealing purposes positioned near to end surfaces of the first part. The sector shaped plates are pivotally connected to axially fixed center plates attached to the second part at ends of the first part, and each of the sector shaped plates includes at a radially outer end thereof a device which has at least one support member including a circular cylindrical sliding shoe for setting a clearance between respective ends of the sector shaped plates and an edge flange provided at each end of the first part.