Patent ID: 8707992

Claim:
A fluid apparatus unit structure comprising: a plurality of fluid apparatus components that are connected via a flow path and grouped together and integrated into a base member, with said fluid apparatus components being positioned adjacent to each other to form a chemical fluid path that carries out circulation of chemical fluid, said fluid apparatus components having installation surfaces with heights that are different from each other and that are linked to each other by the fluid path, a chemical fluid inlet and a chemical fluid outlet, with the fluid apparatus components being positioned therebetween such that the chemical fluid flows from the chemical fluid inlet toward the chemical fluid outlet, wherein the installation surfaces and their associated flow paths which are adjacent to each other and the adjacent installation surfaces have heights which are reduced stepwise from the upstream side toward the downstream side in the flow direction, the flow path slants downward from the upstream side toward the downstream side in the flow direction so that the chemical fluid drops naturally and flows downwards under its own weight by gravity, each of the fluid apparatus components has a chemical fluid discharge port that is higher than a downstream discharge port of an adjacent fluid apparatus component, and the height of the chemical fluid outlet is lower than that of the chemical fluid inlet.