spring 15 shown compressed in fig2 as the locking key 12 is propelled toward the surface 27 of push rod retaining socket 9 locking key 12 is joined to key drive retainer 4 at the connecting juncture position 28 the locking key 12 drives the push rod retaining socket 9 driving the push rod 13 activating the valve not shown it should be noted that when push rod 13 is driven in the direction of arrow u201c 6 u201d the locking key 12 is compressed between surface 27 and connecting juncture 28 holding that locked position when the valve spring thrusts the rocker not shown and push rod 13 in the direction of arrow u201c 29 u201d the inertia of the locking key 12 and spring 15 are working in conjunction to keep the locking key 12 at a connection juncture 28 until the camshaft base circle time zone is reached wherein only spring 15 keeps locking key 12 seated during the camshaft base circle time period the solenoid is energized driving the locking key 12 to compress spring 15 and index the locking key 12 to the unlocked mode it should be appreciated that during this event the locking key 12 moves rotatively at the same velocity as key drive retainer 4 referring to fig3 the pulse drive valve deactivator 1 is shown functioning in a locked mode driving push rod 13 wave spring 20 returns the armature 16 to a rest position against stop 18 of the solenoid frame 19 tappet 2 is shown in a high lift position driving the key drive retainer 4 which is joined to the locking key 12 at connecting juncture 28 thereby activating push rod retaining socket 9.