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