Valve for controlling a hydropneumatic device for pressure intensifying, and hydropneumatic device for pressure intensifying with a valve

A valve for controlling a hydropneumatic device for pressure intensifying having a working plunger and an intensifier plunger for pressure intensifying, the intensifier plunger being designed to move the working plunger hydraulically with a comparatively high transmission ratio on account of a pneumatic actuation, the valve having a differential plunger arrangement with a first plunger with a first active plunger face in a first pressure space and a second plunger with a second active plunger face in a second pressure space, the first plunger being coupled to the second plunger, the first pressure space being equipped with a first connector for a pneumatic control pressure, in particular return stroke space of the working plunger or an external switching connector, and the second pressure space being equipped with a second connector for a pneumatic pressure source which differs from the control pressure, and, in the case of a predefined pressure difference, the valve switching during a working stroke of the working plunger and loading the intensifier plunger with an intensifier pressure, said valve further comprising a third plunger with a third active plunger face, which third plunger is coupled to the second plunger and has a third pressure space which can be loaded via a third connector with a pneumatic pressure source, and wherein the valve switches in the case of a predefined pressure difference between the first and third pressure space and supplies any intensifier plunger which is connected with pressure of the second pressure space.