of fig3 is a two stage sealing arrangement in order to create a three stage sealing arrangement the horizontal strip 26 according to fig5 can be produced from a memory alloy above the temperature limit or in the case of steadily rising operating temperature the horizontal strip 26 of the sealing strip 30 stretches in opposite horizontal directions in order to better take up the increasing clearance c fig5 b at the same time the two vertical strips 27 of the memory alloy follow the expansion 29 of the horizontal strip 26 and separate in the direction of the adjacent platforms 14 and 14 u2032 the centrifugal forces which act upon the side protrusions at the upper ends of the two vertical strips 27 bend these vertical strips outwards this bending creates mechanical contacts with the upper sections of the adjacent platforms 14 and 14 u2032 as is shown in fig5 b the bending characteristics and expansion characteristics of the sealing system of memory alloy therefore enable a three stage sealing arrangement with only one sealing strip 30 in the previous explanations the joining technique for connecting the individual strips 26 and 27 to each other was not elaborated upon in more detail however all possible joining techniques for producing the proposed sealing arrangement can be used also the configurations of the sealing strips which are explained in detail must be understood only as examples wherein the seals may also be formed of non strip like elements or components other configurations of the sealing arrangement are possible within the scope of the invention and may contain other mechanisms for deformation of the memory alloy and also differently formed constructions and combinations of different geometric shapes which are triggered as a.