| 主权项 |
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; and closing elements arranged in series and moveable relative to each other, which in the closed position prevent the overflow of fluids 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 between each other 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 designed on 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 the at least two valve housing parts and forming a cylindrical first seating and, in the course of its opening movement, comes to rest in a sealing manner on or in a 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 its seat-cleaning position to rinse the second seating through a second partial lift rectified with the opening movement and the first closing element is transferred into its 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 its first end section a first seal that seals up radially with respect to the cylindrical first seating; wherein the second closing element has, on its 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 the radial outside flush with the diameter of the cylindrical first seating; wherein the rotationally symmetrical opening is delimited at least in sections by a deflection surface, a contour of which, seen in a meridian cut, has a kink-free progression; 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 the 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 its second end section on the transition surface adjacent to the first seating (2a); and wherein the deflection surface, with a region of extension facing away from its radially outer end, delimits the 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. |
