A cylinder valve assembly for an internal combustion engine, comprising: a valve; a valve actuator for moving said valve; a pneumatic valve spring arrangement including a first valve spring member and a second valve spring member defining a valve spring cavity, said second valve spring member being arranged to move in relation to said first valve spring member to compress gas in said valve spring cavity when said valve actuator moves said valve; and a valve spring venting arrangement comprising: a first venting cavity portion in fluid flow connection with said valve spring cavity; a second venting cavity portion; a movable sealing member arranged to allow a pressure difference between a first gas pressure (P 1) in said first venting cavity portion and a second gas pressure (P 2) in said second venting cavity portion; a venting channel for gas exhaust from said valve spring venting arrangement, wherein said sealing member is configured to be movable between: a first sealing member position in which said sealing member is arranged in such a way that said sealing member prevents fluid flow from said first venting cavity portion through said venting channel; and a second sealing member position in which said sealing member is arranged in such a way that said sealing member allows fluid flow from said first venting cavity portion through said venting channel, wherein said valve spring venting arrangement further comprises an elastic member urging said sealing member to move from said second sealing member position towards said first sealing member position, characterized in that said valve spring venting arrangement comprises a feedback channel allowing fluid flow from said first venting cavity portion to said second venting cavity portion. a valve; a valve actuator for moving said valve; a pneumatic valve spring arrangement including a first valve spring member and a second valve spring member defining a valve spring cavity, said second valve spring member being arranged to move in relation to said first valve spring member to compress gas in said valve spring cavity when said valve actuator moves said valve; and a valve spring venting arrangement comprising: a first venting cavity portion in fluid flow connection with said valve spring cavity; a second venting cavity portion; a movable sealing member arranged to allow a pressure difference between a first gas pressure (P 1) in said first venting cavity portion and a second gas pressure (P 2) in said second venting cavity portion; a venting channel for gas exhaust from said valve spring venting arrangement, wherein said sealing member is configured to be movable between: a first sealing member position in which said sealing member is arranged in such a way that said sealing member prevents fluid flow from said first venting cavity portion through said venting channel; and a second sealing member position in which said sealing member is arranged in such a way that said sealing member allows fluid flow from said first venting cavity portion through said venting channel, wherein said valve spring venting arrangement further comprises an elastic member urging said sealing member to move from said second sealing member position towards said first sealing member position, a first venting cavity portion in fluid flow connection with said valve spring cavity; a second venting cavity portion; a movable sealing member arranged to allow a pressure difference between a first gas pressure (P 1) in said first venting cavity portion and a second gas pressure (P 2) in said second venting cavity portion; a venting channel for gas exhaust from said valve spring venting arrangement, wherein said sealing member is configured to be movable between: a first sealing member position in which said sealing member is arranged in such a way that said sealing member prevents fluid flow from said first venting cavity portion through said venting channel; and a second sealing member position in which said sealing member is arranged in such a way that said sealing member allows fluid flow from said first venting cavity portion through said venting channel, wherein said valve spring venting arrangement further comprises an elastic member urging said sealing member to move from said second sealing member position towards said first sealing member position, a first sealing member position in which said sealing member is arranged in such a way that said sealing member prevents fluid flow from said first venting cavity portion through said venting channel; and a second sealing member position in which said sealing member is arranged in such a way that said sealing member allows fluid flow from said first venting cavity portion through said venting channel, wherein said valve spring venting arrangement further comprises an elastic member urging said sealing member to move from said second sealing member position towards said first sealing member position, characterized in that said valve spring venting arrangement comprises a feedback channel allowing fluid flow from said first venting cavity portion to said second venting cavity portion.