Sanitary shut-off or switch-over valve, comprising - a valve housing body, - a valve actuating member disposed on the valve housing body for axial movement, and - a switch-over device, - wherein the switch-over device comprises the following: a switch-over housing body, - a switch-over member acting on the valve actuating member, - a spring holding arrangement which retains the switch-over member on the switch-over housing body in a spring-elastic manner capable of translational movement in a switch-over direction (T S) from an initial position (P A) to a switch-over position (P S), wherein the spring holding arrangement is a spring strip which is fixed on the switch-over housing body with both of its ends and includes the switch-over member in a central region, and provides a return element which exerts a return force (F R) on the switch-over member in the switch-over position in the direction towards the initial position, - an operating pin as a user interface which is held on the switch-over housing body capable of tilting movement between two end positions (E 1, E 2) in a tilting plane (K E) parallel in relation to the switch-over direction of the switch-over member, and - a transmission unit between the switch-over member and the operating pin, including a sliding guide mechanism which transfers the tilting movement of the operating pin into the translational movement of the switch-over member, - wherein the switch-over position of the switch-over member corresponds to an intermediate position (Z B) of the operating pin between the two end positions thereof. - a valve housing body, - a valve actuating member disposed on the valve housing body for axial movement, and - a switch-over device, - wherein the switch-over device comprises the following: a switch-over housing body, - a switch-over member acting on the valve actuating member, - a spring holding arrangement which retains the switch-over member on the switch-over housing body in a spring-elastic manner capable of translational movement in a switch-over direction (T S) from an initial position (P A) to a switch-over position (P S), wherein the spring holding arrangement is a spring strip which is fixed on the switch-over housing body with both of its ends and includes the switch-over member in a central region, and provides a return element which exerts a return force (F R) on the switch-over member in the switch-over position in the direction towards the initial position, - an operating pin as a user interface which is held on the switch-over housing body capable of tilting movement between two end positions (E 1, E 2) in a tilting plane (K E) parallel in relation to the switch-over direction of the switch-over member, and - a transmission unit between the switch-over member and the operating pin, including a sliding guide mechanism which transfers the tilting movement of the operating pin into the translational movement of the switch-over member, - wherein the switch-over position of the switch-over member corresponds to an intermediate position (Z B) of the operating pin between the two end positions thereof. a switch-over housing body, - a switch-over member acting on the valve actuating member, - a spring holding arrangement which retains the switch-over member on the switch-over housing body in a spring-elastic manner capable of translational movement in a switch-over direction (T S) from an initial position (P A) to a switch-over position (P S), wherein the spring holding arrangement is a spring strip which is fixed on the switch-over housing body with both of its ends and includes the switch-over member in a central region, and provides a return element which exerts a return force (F R) on the switch-over member in the switch-over position in the direction towards the initial position, - an operating pin as a user interface which is held on the switch-over housing body capable of tilting movement between two end positions (E 1, E 2) in a tilting plane (K E) parallel in relation to the switch-over direction of the switch-over member, and - a transmission unit between the switch-over member and the operating pin, including a sliding guide mechanism which transfers the tilting movement of the operating pin into the translational movement of the switch-over member, - wherein the switch-over position of the switch-over member corresponds to an intermediate position (Z B) of the operating pin between the two end positions thereof.