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