Valve drive for an internal combustion engine, internal combustion engine comprising such a valve drive, and method for operating an internal combustion engine comprising such a valve drive

A valve drive for an internal combustion engine, comprising:

• at least one gas exchange valve;
• a first, mechanically driven, drive mechanism;
• a second drive mechanism connected to the at least one gas exchange valve for repositioning the at least one gas exchange valve;
• a hydraulic coupling installation that operatively connects the first drive mechanism to the second drive mechanism, wherein the hydraulic coupling installation has a pressure chamber which is capable of being relieved of pressure and which under hydraulic pressure is specified for coupling the first drive mechanism to the second drive mechanism, and in a pressure-relieved state is specified for decoupling the first drive mechanism from the second drive mechanism;
• a valve installation connected to the pressure chamber to relieve the pressure in the pressure chamber, wherein the valve installation has at least two switch valves which are fluidically connected in parallel to the pressure chamber and by way of which the pressure chamber in an opened state is capable of being relieved of pressure by at least one of the switch valves;
• and
• a control apparatus configured to actuate the switch valves in a temporally offset manner for representing a variable valve stroke of the at least one gas exchange valve during a stroke movement of the gas exchange valve.