induces longitudinal movement of the compression control valve spool 55 against the biasing force of the coil spring 60 when the compression control valve spool 55 moves longitudinally the cup shaped spool skirt 58 uncovers a portion of the compression flow apertures 44 creating a hydraulic flow path between the second opening 37 and the outer volume 31 this hydraulic flow path allows the hydraulic fluid 19 to flow from the hydraulic damper 39 s lower portion 18 into the outer volume 31 and subsequently into the inner volume 32 via the array of transfer flow apertures 45 the operating pressure in the hydraulic fluid 19 acts upon the inner surface of the one way check shim 52 of the rebound control valve spool 50 so as to create a flow path to the first opening 35 via the exit flow apertures 51 in this manner a continuous flow path is created between the hydraulic damper 39 s lower portion 18 and upper portion 16 with the limiting hydraulic flow area restriction defined by the compression flow apertures 44 of the hydraulic damper spool valve 20 varying the induced operating pressure of the hydraulic fluid 19 in the hydraulic damper 39 s lower portion 18 creates a proportional longitudinal movement of the compression control valve spool 55 against the biasing force of the coil spring 60 which in turn changes the area of the limiting hydraulic flow restriction by proportionally exposing larger and smaller.