Modular system and method of manufacturing valves, assembly, and valve

A method of manufacturing valves of two different valve types which differ in their dead volumes and which each include a valve basic unit of identical construction, which comprises a pneumatic drive unit having a housing, an actuator base arranged within the housing, and a piston/spindle unit arranged within the housing, the piston/spindle unit including a piston displaceable in the housing, an end face of the piston and an end face of the actuator base opposite the end face of the piston defining a variable-volume pressure chamber in an interior of the housing, the actuator base and the housing delimiting a fixed-volume dead space chamber on a side of the actuator base facing away from the piston, and the actuator base having at least one passage opening between the dead space chamber and the pressure chamber;

• and wherein
• (a) in valves of a first valve type, a closure member is inserted into one passage opening or, in case of a plurality of passage openings, into each of the passage openings of the actuator base, so that the respective passage opening is permanently sealed in a gas-tight manner and the dead space chamber is permanently fluidically uncoupled from the pressure chamber, and
• (b) in valves of a second valve type, the at least one passage opening remains unsealed, so that the dead space chamber is in permanent fluid communication with the pressure chamber via the at least one passage opening.