Fluid module, fluid system and method of cleaning a fluid module

A fluid system comprising at least two fluid modules,

• each fluid module having a valve node which includes a base body delimited by an outer surface and having a central fluid space, and at least four fluid channels which are fluidically separated from each other and each open into the central fluid space, wherein at least two valve connections are provided on the outer surface, and wherein a coupling point is provided on the valve node, a coupling module being fastened to the coupling point, a connection channel being formed in the coupling module, the connection channel being fluidically connected to one of the fluid channels in the valve node, and wherein the coupling module comprises a coupling valve which selectively unblocks and closes the connection channel,
• wherein the individual fluid modules are connected to each other such that an output fluid channel of the fluid channels of one fluid module is fluidically connected to an input fluid channel of the fluid channels of the at least one further fluid module.