초록 ▼

A double-seat valve has a seat-cleaning function and ensures that the seat-cleaning flow is conducted into and out of the leakage hollow space with as little turbulence as possible. The valve reliably prevents a pressure-increasing direct action upon the seat regions, even in the event that the cros

A double-seat valve has a seat-cleaning function and ensures that the seat-cleaning flow is conducted into and out of the leakage hollow space with as little turbulence as possible. The valve reliably prevents a pressure-increasing direct action upon the seat regions, even in the event that the cross-sectional area of the drain bore is smaller than that of the largest pipeline that can be connected to the valve. This is achieved in that a region of extension of the deflection surface that faces away from the radially outer end of the deflection surface delimits the remaining region of the opening in its entirety and opens out from the second closing element at an end-face and radially inner end of the second closing element, facing the first closing element.

대표청구항 ▼

1. A double-seat valve having a closed position and an open position, the double-seat valve comprising: a valve housing defining a longitudinal axis and formed of at least two valve housing parts; anda first closing element and a second closing element arranged in series and moveable relative to eac

1. A double-seat valve having a closed position and an open position, the double-seat valve comprising: a valve housing defining a longitudinal axis and formed of at least two valve housing parts; anda first closing element and a second closing element arranged in series and moveable relative to each other, which in the closed position prevent an overflow of fluid from a valve housing part of the at least two valve housing parts into another of the at least two valve housing parts, and which delimit a leakage hollow space therebetween both in the closed as well as in the open position;wherein the leakage hollow space is connected with the surroundings of the double-seat valve via a drain bore that is delimited by a pipe shaft connected to the first closing element led out of the valve housing;wherein, in the closed position, the first closing element designed as a pusher piston is received in a sealing manner in a connection opening interconnecting the at least two valve housing parts and forming a cylindrical first seating and, in a course of an opening movement in a first direction, comes to rest in a sealing manner on or in the second closing element that is assigned to a second seating, and wherein the second closing element is also transferred to the open position during the opening movement;wherein the second closing element is transferred into a seat-cleaning position to rinse the second seating through a second partial lift positioned in the first direction and the first closing element is transferred into a seat-cleaning position to rinse the cylindrical first seating through a first partial lift opposing the opening movement;wherein the first closing element has on a first end section a first seal that seals up radially with respect to the cylindrical first seating;wherein the second closing element has, on a second end section facing the first closing element, a rotationally symmetrical opening;wherein, in the closed position of the double-seat valve, the rotationally symmetrical opening connects to the cylindrical first seating on a first radial outside flush with a diameter of the cylindrical first seating;wherein the rotationally symmetrical opening is delimited in a radially outside part by a deflection surface, the deflection surface having a progression of a contour that changes continuously without kinks;wherein a radially outer end of the deflection surface ends directly or indirectly in an end-face side delimitation surface of the second end section;wherein each of the first end section and the second end section forms an annular restriction gap in the respective seat-cleaning position of the first closing element and the second closing element on a second radial outside with a connection opening;wherein the cylindrical first seating has a diameter that is smaller than a diameter of an annular opening assigned to the second closing element in the connection opening and a transition surface is between the cylindrical first seating and the annular opening;wherein the second closing element, in the closed position, lies with a stop surface arranged on an end surface of a second end section on the transition surface adjacent to the first seating; andwherein the deflection surface, with a region of extension facing away from a radially outer end, delimits a remaining region of the rotationally symmetrical opening in its entirety and ends from the second closing element at an end-face and radially inner end of the second closing element facing the first closing element, an end surface of the second closing element located outside the rotationally symmetrical opening. 2. The double-seat valve according to claim 1, wherein the end-face and radially inner end of the second closing element, seen in the longitudinal axis, protrudes beyond an imaginary space that is delimited by a plane passing through the stop surface. 3. The double-seat valve according to claim 1, wherein the first closing element, in the course of the opening movement, comes to rest in a sealing manner on the second closing element via a middle seal acting between the first closing element and the second closing element. 4. The double-seat valve according to claim 1, wherein: the rotationally symmetrical opening at a radially outer outlet point from the second end section has a mainly cylindrical circumferential wall that is flush with the cylindrical first seating;the circumferential wall transitions into the deflection surface; andthe rotationally symmetrical opening is dimensioned in order to receive, in a sealing manner during the opening movement, the first end section and the first seal of the first closing element before the second closing element opens. 5. The double-seat valve according to claim 1, wherein: the second seating is cylindrical and is formed by the annular opening; andthe second closing element has a second seal that seals off radially with respect to the second seating in sliding engagement. 6. The double-seat valve according to claim 1, wherein: the second seating is conical and is formed by the transition surface or by a surface connecting to the annular opening on an opposite side of the transition surface; andthe second closing element has a second seal that seals off axially/radially with respect to the second seating in sliding/pressing engagement. 7. The double-seat valve according to claim 1, wherein: the second seating is arranged perpendicular to the longitudinal axis and is formed by the transition surface or by a surface connecting to the annular opening on an opposite side of the transition surface; andthe second closing element has a second seal that seals off axially with respect to the second seating in pressing engagement. 8. The double-seat valve according to claim 1, wherein: the at least two valve housing parts are designed according to a largest nominal passage cross-section of a pipeline which is connected thereto and are interconnected via a seat ring forming the connection opening on the inside; anda connecting element forms a section of the drain bore on the inside and penetrates at least the connection opening during a full opening stroke of the double-seat valve, the connecting element dimensioned there on a third radial outside such that the connection opening at a narrowest point forms an annular space with an annular-space passage cross-section that is equal to or greater than a largest nominal passage cross-section. 9. The double-seat valve according to claim 8, wherein the drain bore tapers from a leakage-hollow-space-side end of the first closing element in an inlet funnel in a conical manner and continuously up to the connecting element and has in the connecting element on a restricted length a minimum drain cross-section. 10. The double-seat valve according to claim 8, wherein the drain bore expands subsequent to the connecting element in a first pressure compensating piston the pressure compensating piston having an outer diameter corresponding with the cylindrical first seating. 11. The double-seat valve according to claim 9, wherein the inlet funnel with a volume of liquid accumulating in it forms a fill level, a hydrostatic pressure of which is sufficient to convey the volume of liquid generated in the respective seat-cleaning position at least through the minimum drain cross-section of the connecting element, which connects to the fill level in a gravitational direction. 12. The double-seat valve according to claim 1, wherein a radial second gap width of the annular restriction gap formed by the second end section is smaller than a radial first gap width of the annular restriction gap formed by the first end section. 13. The double-seat valve according to claim 12, wherein the annular restriction gaps with respective radial first gap width and radial second gap width each have an associated length and are designed such that volume flows of liquid generated by associated seat-cleaning flows in the respective seat-cleaning positions with the first and second partial lifts are the same. 14. The double-seat valve according to claim 1, wherein the annular opening forms a perpendicular deflection angle with the transition surface. 15. The double-seat valve according to claim 1, wherein the contour consists of a sequence of curved sections, each of which has a common tangent at their transition points. 16. The double-seat valve according to claim 8, wherein a first connecting rod connected with the first closing element is reduced in its cross-section at least in the region of extension to a cross-sectionally reduced valve rod area.