Sanitary change-over valve and assembly comprising a change-over valve of this type

A sanitary functional group having a change over valve (1), comprising a valve housing (2) which has one valve inlet (3) and first and second selectively actuatable valve outlets (4, 5), a valve piston (6) which is movable from a first switch-over position in which fluid is adapted to be guided by a first flow path routed through the first valve outlet (4) to a second switch-over position in which the fluid is guided by a second flow path routed to the second valve outlet (5) as soon as a portion of the second flow path that is routed beyond the change-over valve (1) has been released, the valve piston (6) is configured as a hollow body through which the fluid in the course of at least one of the flow paths is adapted to be routed by at least one piston inlet (9) that is disposed on a piston circumference, the fluid that is routed by the at least one piston inlet (9) in the course of the second flow path is routed by a first piston outlet that is provided on a piston end side that faces away from a piston base (10), and a flow throttle (12), a flow regulator (11), or a return flow preventer is provided in the first piston outlet, wherein the valve housing (2) of said change-over valve being inserted into an insert housing (24), said insert housing (24) being disposed in a coupling housing, said coupling housing (22) having a sleeve-shaped housing portion (23) for receiving the insert housing (24), a line connector (25) for the second flow path being provided laterally on said sleeve-shaped housing portion (23), one front end of the sleeve-shaped housing portion (23) receives the insert housing (24) on which a line connector (25) for the second flow path is provided laterally, the one front end of the sleeve-shaped housing portion (23) forms a housing inlet of the coupling housing (22) and another front end forms a housing outlet of the coupling housing.