Process valve manifold and heat exchanger system

A process valve manifold comprising an inlet for a heat transfer medium, a main outlet for said heat transfer medium, a main duct extending between said inlet and said main outlet, ports for secondary circuits, a 3/2-way valve which is arranged in said main duct, a bypass outlet, said 3/2-way valve having 3 ports and being switchable between different positions, said positions determining a flow cross-section by which said bypass outlet and said main outlet are in communication with said main duct, said positions being continuously variable between a state in which all of the heat transfer medium leaves the process valve manifold through the main outlet and a state in which all of the heat transfer medium leaves the process valve manifold through the bypass outlet, and comprising control valves for determining a flow cross-section between said main duct and said ports for secondary circuits, wherein the main outlet of the process valve manifold is connectable to a fluid communication extending from the main outlet to the inlet and running through a cooling duct of a prime mover, and wherein the bypass outlet is connectable to a bypass flow pipe extending from the bypass outlet to the fluid communication, which bypass flow pipe opens into the fluid communication downstream of the prime mover.