Patent ID: 8336572
Filing Date: 2012-12-25
Classification: F16K,Y10T

Abstract:
1. A double seat valve with seat cleaning, with a first and a second closing elements ( 3 , 4 ) arranged in a series, and which can be moved relative to one other, and that in the closed position of the double seat valve ( 1 ) prevent the overflow of fluids from one valve housing part ( 1 a; 1 b ) into another housing part ( 1 b; 1 a ), that in the closed position as well in the open position define a leakage cavity ( 5 ) that is connected to surroundings of the double seat valve ( 1 ), wherein a cylindrical first seat ( 2 a ) is associated with the first closing element ( 3 ) and a second seat ( 2 b ) is associated with the second closing element ( 4 ) wherein the first and second seat ( 2 a , 2 b ) are coaxial, wherein in the closed position the first closing element ( 3 ), formed as a slide piston, is received in a sealing manner in a connecting opening ( 2 c ) that connects the valve housing parts ( 1 a, 1 b ) with each other, and in the course of its opening movement comes into sealing abutment, through a center seal ( 8 ; 8 *) acting between the first and second closing elements ( 3 , 4 ), wherein the second closing element ( 4 ) has a second seal ( 7 ), and in a further opening movement the second closing element ( 4 ) is also transferred into an open position (H), wherein the first closing element ( 3 ) has a first seal ( 6 ) that radially seals against the cylindrical first seat ( 2 a ) formed in the connecting opening ( 2 c ), with closing elements ( 3 , 4 ) that can independently of each other be transferred gap wide by a partial lift, into a seat cleaning position for the purpose of rinsing their coaxial seats ( 2 a, 2 b ), wherein the second closing element ( 4 ) can be transferred through a second partial lift (T 2 ) in the same direction as the opening movement, and the first closing element ( 3 ) through a first partial lift (T 1 ) in the direction opposed to the opening movement, each into their respective seat cleaning position, wherein the second closing element ( 4 ) in its closed position abuts with a stop surface ( 4 e ) which is arranged at its periphery that is adjacent radially on the inside of the second seal ( 7 ), to the second seat ( 2 b ), specifically immediately bordering on the first seat ( 2 a, 2 g ), wherein in the front face of the second closing element ( 4 ), facing the leakage cavity ( 5 ), a centered recess ( 4 d ) is provided which begins radially on the outside with a rotationally symmetric deflection surface ( 4 b ), and on its front side is bounded by a front face ( 4 c ) that is oriented perpendicular to the longitudinal axis of the second closing element ( 4 ), wherein the deflection surface ( 4 b ) opens into the front face ( 4 c ), wherein the deflection surface ( 4 b ) and the stop surface ( 4 e ) form a second circumferential edge (U 2 ) which in the closed position of the second closing element ( 4 ) borders directly on a first end section ( 2 g ) of the first seat ( 2 a ), wherein, viewed in a meridian section, the deflection surface ( 4 b ) has a contour (K) with an unbent shape, and a directional vector at the opening point of the deflection surface ( 4 b ) points into a drainage hole ( 3 d ) that is centrally arranged in the first closing element ( 3 ), without colliding with the first closing element ( 3 ) in the region of its areas bounding the leakage cavity ( 5 ) or with the center seal ( 8 ; 8 *), creating a dynamic pressure, and wherein a front side boundary of the first closing element ( 3 ), facing the leakage cavity ( 5 ), has an axial safety distance (x) from the directional vector at an outlet point of the second seat ( 2 b ), formed as a first circumferential edge (U 1 ), into the first end section ( 2 g ).