face 20 that is a sort of offset front side of the cylinder element 2 on which the valve plate arrangement 6 is supported under insertion of a sealing 21 the valve plate arrangement 6 is then loaded in the direction of the cylinder element 2 in such a way that the sealing 21 is compressed then the valve plate arrangement 6 or rather the valve plate 7 is connected by means of a welded connection 22 with a circumferential flange 23 of the cylinder element 2 so that the sealing 21 remains compressed the welded connection 22 can also be replaced by another connection kind for example a bordering connection in this connection it is expedient when the flange 23 projects over the valve plate arrangement 6 or the valve plate arrangement 6 has a circumferential groove in which a corresponding bordering edge can engage the sealing 21 seals the compression chamber 3 in the area of the end facing the valve plate arrangement 6 thus preventing that compressed refrigerant gas escapes to the outside here the only way for the refrigerant gas to leave the compression chamber 3 remains the pressure opening 17 when it is released by the pressure valve element 13 fig7 shows an embodiment of a suction valve plate 15 which is somewhat modified in relation to the embodiment shown in fig5 the same parts have the same reference numbers slits 24 have.