초록

What is disclosed is a non-return valve comprising a sealing piston which is biased against a valve seat in the basic position inside a valve housing, and which is manufactured by a plastics injection molding technique.

대표청구항 ▼

The invention claimed is: 1. A non-return valve comprising: a hollow sealing piston received in a valve housing and biased against a valve seat by means of a spring in a basic position, so that in the basic position a pressure medium connection between two working ports in a direction of flow there

The invention claimed is: 1. A non-return valve comprising: a hollow sealing piston received in a valve housing and biased against a valve seat by means of a spring in a basic position, so that in the basic position a pressure medium connection between two working ports in a direction of flow therethrough is closed; and wherein the sealing piston is manufactured by a plastics injection molding technique; wherein the sealing piston includes a star configuration of bores, through the bores of which a pressure medium may flow into a spring chamber in an opened position; and wherein guide projections are formed between the bores, which guide projections have a triangular shape and taper in a flow-receiving direction. 2. The non-return valve in accordance with claim 1, wherein the sealing piston is manufactured of a plastics material PEEK. 3. The non-return valve in accordance with claim 1, wherein the sealing piston is reinforced by 30% of carbon fiber. 4. The non-return valve in accordance with claim 1, wherein the sealing piston includes a multiplicity of recesses on an outer periphery, so that the sealing piston is guided in a longitudinal bore by axial webs delimiting the recesses from each other. 5. The non-return valve in accordance with claim 4, wherein six recesses and four bores are provided. 6. The non-return valve in accordance with claim 1, wherein the sealing piston comprises a flow-receiving cone. 7. The non-return valve in accordance with claim 6, wherein the flow-receiving cone has a rounded head. 8. A non-return valve comprising: a hollow sealing piston received in a valve housing and biased against a valve seat by means of a spring in a basic position, so that in the basic position a pressure medium connection between two working ports in a direction of flow therethrough is closed; and wherein the sealing piston is manufactured by a plastics injection molding technique; wherein the sealing piston includes a star configuration of bores, through the bores of which a pressure medium may flow into a spring chamber in an opened position; and wherein guide projections are formed between the bores, the guide projections having an axial length approximately corresponding to inner diameters of the bores; and wherein the sealing piston is adapted for a flow therethrough and includes a multiplicity of recesses on an outer periphery, so that the sealing piston is guided in a longitudinal bore by axial webs delimiting the recesses from each other; wherein the guide projections extend forward, to between the star configuration of bores, from an annular collar of the sealing piston; and wherein the axial webs extend rearward from the annular collar. 9. The non-return valve in accordance with claim 8, wherein the sealing piston is manufactured of a plastics material PEEK. 10. The non-return valve in accordance with claim 8, wherein the sealing piston is reinforced by 30% of carbon fiber. 11. The non-return valve in accordance with claim 8, wherein six recesses and four bores are provided. 12. The non-return valve in accordance with claim 8, wherein the sealing piston comprises a flow-receiving cone. 13. The non-return valve in accordance with claim 12, wherein the flow-receiving cone has a rounded head. 14. A non-return valve comprising: a hollow sealing piston received in a valve housing and biased against a valve seat by means of a spring in a basic position, so that in the basic position a pressure medium connection between two working ports in a direction of flow therethrough is closed; and wherein the sealing piston is manufactured by a plastics injection molding technique; wherein the spring is supported in the valve housing by a spring cup made of plastics; wherein the spring cup has at its outer periphery and/or on its front side at least one sealing lip; wherein the spring cup further includes radial sealing lips that are inclined against a direction of pressure build-up; and wherein front-side sealing lips are inclined in the direction of pressure build-up. 15. The non-return valve in accordance with claim 14, wherein the sealing piston is manufactured of a plastics material PEEK. 16. The non-return valve in accordance with claim 14, wherein the sealing piston is reinforced by 30% of carbon fiber. 17. The non-return valve in accordance with claim 14, wherein the sealing piston includes a multiplicity of recesses on an outer periphery, so that the sealing piston is guided in a longitudinal bore by axial webs delimiting recesses from each other. 18. The non-return valve in accordance with claim 17, wherein six recesses and four bores are provided. 19. The non-return valve in accordance with claim 14, wherein the sealing piston comprises a flow-receiving cone. 20. The non-return valve in accordance with claim 19, wherein the flow-receiving cone has a rounded head.