Patent ID: 9546735
Date: 2017-01-17
CPC Classifications: F16K,Y10T

Claim:
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 a 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; and wherein 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.