Valve control for reciprocating piston internal combustion engine

Valve controller for reciprocating piston internal combustion engines with at least two intake or exhaust gas-exchange valves for each piston/cylinder unit, wherein the gas-exchange valves are guided by valve stems in a cylinder head of the reciprocating piston internal combustion engine, loaded in a closing direction by valve springs, a common bridge that controls the valves through the use of an activation device, the activation device is constructed as a hydraulic unit with at least one pumping piston that is in active connection with at least one cam of a camshaft driven by a reciprocating piston internal combustion engine, with at least one master piston that is guided in a housing and is connected with a convex master surface to the bridge, and with an electrically/electronically activated control device that directs an inflow and outflow of hydraulic medium at least to the master piston, the bridge is guided by a sliding guide parallel to a movement direction of the gas-exchange valves, the bridge has at least one hydraulic valve clearance compensation element that connects to a gas-exchange valve, and a device is provided that prevents rotation of the bridge about the sliding guide, and the bridge has a tappet that is in active connection with the master piston, and the tappet is constructed as the sliding guide for the bridge that is guided in the cylinder of the master piston on the housing.