Patent ID: 8733392

Claim:
A paint circulating system back pressure regulator comprising: a paint flow passage at least partially disposed between a fixed structure and a moveable structure, wherein the moveable structure is moveable to vary a width of the paint flow passage to regulate a pressure of paint upstream of the regulator while paint flows through the paint flow passage, and the moveable structure comprises a rigid structure coupled to a first flexible membrane that opens and closes against a surface of the fixed structure, wherein a surface of the first flexible membrane contacts the fixed structure when the moveable structure closes against the surface of the fixed structure; a chamber having an opening configured to communicate with a supply of pressurized fluid, wherein the regulator is configured to vary a fluid pressure of the pressurized fluid to control an adjustable set point of the pressure of paint upstream of the regulator; and a plurality of independent moveable structures each located in a separate chamber of a plurality of separate chambers, wherein each respective separate chamber of the plurality of separate chambers is configured to be independently pressurized by the supply of pressurized fluid to move one of the plurality of independent moveable structures.