If, during {HEAD ~ the activation process} of gas exchange valve 10, the current to magnetic valve 42 is switched off, magnetic valve 42 opens, and triggers, through {TAIL ~ the relief} of hydraulic working chamber 20, the closing process of gas exchange valve 10 by valve closing spring 21 
If , during { HEAD ~ the activation process } of gas exchange valve 10 , the current to magnetic valve 42 is switched off , magnetic valve 42 opens , and triggers , through { TAIL ~ the relief } of hydraulic working chamber 20 , the closing process of gas exchange valve 10 by valve closing spring 21
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH