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A double seat valve comprising a valve housing, a first closing element, a second closing element, a leakage chamber arranged intermediate the first and second closing elements, the second closing element connected to the second displacement rod via spokes, wherein at least one of the spokes compris

A double seat valve comprising a valve housing, a first closing element, a second closing element, a leakage chamber arranged intermediate the first and second closing elements, the second closing element connected to the second displacement rod via spokes, wherein at least one of the spokes comprises: a leading edge that faces the leakage chamber and extends in a radial direction outwards from the second displacement rod; and first and second sides that extend from the leading edge in a direction from the leakage chamber to the drain passage on a respective side of the spoke.

대표청구항 ▼

1. A double seat valve comprising a valve housing having a first valve seat and a second valve seat,a first closing element and a first displacement rod that is connected to the first closing element for moving the first closing element into sealing abutment with the first valve seat,a second closin

1. A double seat valve comprising a valve housing having a first valve seat and a second valve seat,a first closing element and a first displacement rod that is connected to the first closing element for moving the first closing element into sealing abutment with the first valve seat,a second closing element and a second displacement rod that is connected to the second closing element for moving the second closing element into sealing abutment with the second valve seat, anda leakage chamber arranged intermediate the first and second closing elements,wherein the closing elements can be lifted independently of one another from their sealing abutment with the respective valve seat, andthe second closing element is connected to the second displacement rod via spokes that extend radially outwards from the second displacement rod to the second closing element, such that interspaces are formed between the spokes for allowing fluid to flow from the leakage chamber and into a drain passage, wherein at least one of the spokes comprises a leading edge that faces the leakage chamber and extends in a radial direction outwards from the second displacement rod,a first side that extends from the leading edge in a direction from the leakage chamber to the drain passage,a second side that extends from the leading edge in the direction from the leakage chamber to the drain passage, anda cross-section that varies in a direction from the leakage chamber to the drain passage so that the at least one spoke possesses a first cross-section, a second cross-section spaced from the first cross-section, and a third cross-section spaced from the second cross-section, the second cross-section being positioned between the first and third cross-sections with respect to the direction from the leakage chamber to the drain passage, the second cross-section being wider than both the first cross-section and the third cross-section. 2. A double seat valve according to claim 1, wherein the leading edge comprises a sharp edge. 3. A double seat valve according to claim 1, wherein the at least one spoke comprises a trailing edge. 4. A double seat valve according to claim 3, wherein the first side and the second side comprises a respectively curved surface. 5. A double seat valve according to claim 3, wherein the trailing edge comprises a sharp edge. 6. A double seat valve according to claim 1, wherein the at least one spoke includes all of the spokes that connect the second closing element to the second displacement rod, the spokes each possessing trailing edges that meet in a trailing tip. 7. A double seat valve according to claim 1, wherein the leading edge extends along the full length of the at least one spoke. 8. A double seat valve according to claim 1, wherein the at least one spoke comprises an abutment member that is located adjacent the leading edge and arranged to abut the first closing element when the closing elements are lifted from the valve seats. 9. A double seat valve according to claim 8, wherein the abutment member is located between the leading edge and a peripheral edge of the second closing element, the at least one spoke comprising a further leading edge that is located between the abutment member and the peripheral edge of the second closing element. 10. A double seat valve according to claim 1, wherein the second closing element comprises the drain passage and wherein an inner surface of the second closing element and an inner surface of the drain passage together form either a continuously curved surface that narrows in the direction from the leakage chamber to the drain passage, ora surface of two or more flat or curved surface segments that narrows in the direction from the leakage chamber to the drain passage. 11. A double seat valve according to claim 1, wherein the second closing element comprises the drain passage and wherein an inner surface of the second closing element and an inner surface of the drain passage together form a trumpet-shaped surface. 12. A double seat valve according to claim 1, wherein the second closing element comprises a peripheral edge and an inner surface that extends from the peripheral edge, in the direction from the leakage chamber to the drain passage. 13. A double seat valve according to claim 1, wherein L1 is 2.8 to 3.4 times larger than L2, where L1 is the diameter of a peripheral surface of the second closing element and L2 is an inner diameter of the drain passage, andL1 is 1.6 to 2 times larger than L3, where L3 is the axial distance between the diameters L1 and L2. 14. A double seat valve comprising a valve housing having a first valve seat and a second valve seat,a first closing element and a first displacement rod that is connected to the first closing element for moving the first closing element into sealing abutment with the first valve seat,a second closing element and a second displacement rod that is connected to the second closing element for moving the second closing element into sealing abutment with the second valve seat,a leakage chamber arranged intermediate the first and second closing elements,the closing elements being configured to be lifted independently of one another from their sealing abutment with the respective valve seat,the second closing element being connected to the second displacement rod via spokes that extend radially outwards from the second displacement rod to the second closing element, such that interspaces are formed between the spokes for allowing fluid to flow from the leakage chamber and into a drain passage, wherein at least one of the spokes comprises,a leading edge that faces the leakage chamber and extends in a radial direction outwards from the second displacement rod,a first side that extends from the leading edge in a direction from the leakage chamber to the drain passage,a second side that extends from the leading edge in the direction from the leakage chamber to the drain passage,the at least one spoke comprising an abutment member that is located adjacent the leading edge and arranged to abut the first closing element when the closing elements are lifted from the valve seats, andthe abutment member being located between the leading edge and a peripheral edge of the second closing element, the at least one spoke comprising a further leading edge that is located between the abutment member and the peripheral edge of the second closing element. 15. A double seat valve according to claim 14, wherein the at least one spoke possesses a cross-section that varies in a direction from the leakage chamber to the drain passage so that the at least one spoke possesses a first cross-section, a second cross-section spaced from the first cross-section, and a third cross-section spaced from the second cross-section, the second cross-section being positioned between the first and third cross-sections with respect to the direction from the leakage chamber to the drain passage, the second cross-section being wider than both the first cross-section and the third cross-section. 16. A double seat valve according to claim 14, wherein the leading edge comprises a sharp edge. 17. A double seat valve according to claim 14, wherein the at least one spoke comprises a trailing edge that is a sharp edge, and the leading edge comprising a sharp edge.