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US 6,382,934 B2Granted
Reversing valve for a compressed air membrane pump
AssigneeALMATEC Maschinenbau GmbH
InventorDirk Budde
Life of this patent
Estimating the term…
Abstract
A reversing valve for a compressed air membrane pump in which an equilibrium state of the main piston in the neutral position, leading to stoppage of the pump, is prevented by disposing the main system piston and the pilot system piston immediately adjacent to one another.
Claims16
A pneumatic reversing system suitable for use in a pressure-driven membrane pump having membranes on either side of the pump, the reversing system comprising:
- a membrane piston displaceable essentially between two positions;
- a main control piston displaceable essentially between two positions, said main control piston is in pneumatic cooperation with said membrane piston;
- and
- means for urging the main control piston towards one of said two positions at all points in an operating cycle of said pump;
- wherein said reversing pump alternately provides compressed air to the membranes on either side of the pump;
- and
- wherein said membrane piston and said main control piston are directly coupled such that a displacement of one of the membrane piston and the main piston causes a displacement of the other, and wherein the main control piston is urged towards one of its two positions at all points in an operating cycle of said pump.
4 more elements
A pneumatic reversing system suitable for use in a pressure driven membrane pump having membranes on either side of the pump, the reversing system comprising:
- a membrane piston displaceable essentially between two positions, said membrane being suitable for coupling with the membranes on either side of the pump;
- a main control piston displaceable between essentially two positions, said main control piston is in pneumatic cooperation with said membrane piston;
- and
- means for urging the main control piston towards one of said two positions at all points in an operating cycle of said pump;
- wherein said reversing pump alternately provides compressed air to the membranes on either side of the pump;
- and
- wherein said membrane piston and said main control piston are pneumatically directly coupled such that a displacement of one of the membrane piston and the main control piston causes a displacement of the other via pneumatic means, and wherein the main control piston is urged towards one of its two positions at all points in an operating cycle of said pump via pneumatic means.
4 more elements
Dependencies are inferred from the claim text.