A paint circulating system back pressure regulator comprises a flow passage for paint, at least part of which is disposed between a fixed structure and a moveable surface which is moveable to vary the width of the flow passage so as to regulate a pressure of paint upstream of the regulator. The regu
A paint circulating system back pressure regulator comprises a flow passage for paint, at least part of which is disposed between a fixed structure and a moveable surface which is moveable to vary the width of the flow passage so as to regulate a pressure of paint upstream of the regulator. The regulator is also provided with a chamber having an opening for communicating with a supply of a pressurized fluid for controlling operation of the regulator.
대표청구항▼
1. 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
1. 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; anda 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. 2. The paint circulating system back pressure regulator as claimed in claim 1, wherein the pressurized fluid is compressed air. 3. The paint circulating system back pressure regulator as claimed in claim 1, comprising a biasing member configured to restrict the paint flow passage against the pressure of paint in the paint flow passage when the pressurized fluid is not applied to the chamber. 4. The paint circulating system back pressure regulator as claimed in claim 3, wherein the biasing member is a coiled spring. 5. The paint circulating system back pressure regulator as claimed in claim 3, wherein the biasing member is of adjustable strength. 6. The paint circulating system back pressure regulator as claimed in claim 4, wherein the coiled spring biases the moveable structure toward a closed position to restrict the paint flow passage, and the chamber is pressurized by the supply of pressurized fluid to bias the moveable structure against the coiled spring and toward an open position to open the paint flow passage. 7. The paint circulating system back pressure regulator as claimed in claim 3, wherein the biasing member is isolated from the paint flow passage. 8. The paint circulating system back pressure regulator as claimed in claim 1, wherein the moveable structure comprises a second flexible membrane coupled to the rigid structure. 9. The paint circulating system back pressure regulator as claimed in claim 1, comprising a coiled spring operable to restrict the paint flow passage against the pressure of paint in the paint flow passage when pressurized fluid is not applied to the plurality of separate chambers. 10. A system, comprising: a back pressure regulator, comprising: a paint flow passage;a fixed structure having a first surface; anda moveable assembly, wherein the movable assembly comprises: a first independently moveable portion having a first structure coupled to a first membrane; anda second independently moveable portion having a second structure coupled to a second membrane, wherein the second independently moveable portion comprises a second surface configured to move against the first surface to close the paint flow passage and move away from the first surface to open the paint flow passage, and the moveable assembly is movable to vary a width of the paint flow passage between the first and second surfaces to regulate a pressure of paint upstream of the back pressure regulator while paint flows through the paint flow passage. 11. The system of claim 10, wherein the back pressure regulator comprises a spring operable to restrict the flow passage against a pressure of paint in the flow passage. 12. The system of claim 11, comprising a spring adjuster configured to adjust a compression of the spring to set the pressure of the paint upstream of the back pressure regulator. 13. The system of claim 10, wherein the first and second independently moveable portions each comprise a shaft and a seal disposed about the shaft. 14. A system, comprising: a back pressure regulator, comprising: a paint flow passage at least partially disposed between a fixed structure and a first moveable structure, wherein the first moveable structure is movable to vary a width of the paint flow passage to regulate a pressure of paint upstream of the back pressure regulator while paint flows through the paint flow passage;a biasing member configured to bias the first moveable structure toward a closed position to close the paint flow passage, wherein the biasing member is isolated from the paint flow passage; andfirst and second chambers configured to communicate with a supply of pressurized fluid, wherein the first chamber comprises a first membrane coupled to a second moveable structure, and the second chamber comprises a second membrane coupled to a third moveable structure, and wherein the back pressure 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 back pressure regulator. 15. The system of claim 14, wherein the pressure of the pressurized fluid biases the first moveable structure against the biasing member and toward an open position to open the paint flow passage. 16. The system of claim 14, wherein the biasing member comprises a spring. 17. 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 flexible membrane that opens and closes against a surface of the fixed structure;a chamber having an opening configured to communicate with a supply of pressurized fluid; anda plurality of independent moveable structures located in separate chambers, wherein each separate chamber is configured to be independently pressurized by the supply of pressurized fluid to move one of the independent moveable structures, 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. 18. The paint circulating system back pressure regulator as claimed in claim 17, comprising a coiled spring operable to restrict the paint flow passage against the pressure of paint in the paint flow passage when pressurized fluid is not applied to the separate chambers.
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