Abstract: The present invention relates to an arrangement for and method of retaining a compressor check valve assembly in a cylinder. Each one of a plurality of wedge segments includes an inner surface, an outer surface, and a tapered hole which passes through the wedge segment between the outer surface and a portion of the inner surface. A bolt passes through the tapered hole in the wedge segment and is received in a threaded bore means within the compressor check valve assembly. With this arrangement, the bolt may be used to draw the wedge segment between the check valve assembly and the interior surface of the cylinder so as to frictionally lock said valve assembly within the cylinder.