Internal limited direction manifold

An internal limited direction manifold, comprising:

• a manifold body comprising a first lateral side, a second lateral side and an inner space, wherein the manifold body is extended along a first direction, the inner space is formed between the first lateral side and the second lateral side, and the first lateral side and the second lateral side are arranged opposite to each other in a second direction, wherein the first direction is perpendicular to the second direction;
• a plurality of inlet fittings disposed on the first lateral side;
• a plurality of check valves accommodated within the inner space, wherein each of the plurality of check valves is correspondingly connected to the plurality of inlet fittings, respectively, wherein each of the plurality of check valves allows a coolant to flow through a corresponding one of the plurality of inlet fittings in a single direction into the inner space;
• and
• at least one outlet fitting disposed on the second lateral side of the manifold body and in communication with the inner space, to guide the coolant out of the inner space.