Patent ID: 8459294
Filing Date: 2013-06-11
Classification: F16K,Y10T

Abstract:
1. A double seat valve, seats of which can be cleaned, with first and second closing elements ( 3 , 4 ) arranged in series which can be moved relative to one another and which in the closed position of the double seat valve ( 1 ) prevent overflow of fluids from one valve housing part ( 1 a ; 1 b ) of a valve housing ( 10 ) into another ( 1 b ; 1 a ), which border between themselves, both in the closed and also in the open position, a leakage cavity ( 5 ) which is connected to the exterior of the double seat valve ( 1 ), in the closed position the first closing element ( 3 ) which is made as a slide piston being accommodated to form a seal in a connection opening ( 2 c ) which joins the valve housing parts ( 1 a , 1 b ) to one another and in the course of its opening motion making sealing contact with the second closing element ( 4 ) which has a second seal ( 7 ) and which is associated with a second seat surface ( 2 b ), and the second closing element in the continued opening motion being likewise transferred into the open position (H), the first closing element ( 3 ) having a first seal ( 6 ) on an end section ( 3 *) of the first closing element ( 3 ) which radially seals relative to a cylindrical first seat surface ( 2 a ) which is made in the connection opening ( 2 c ), the second closing element ( 4 ) on its end facing the first closing element ( 3 ) having a recess ( 4 b ) with a cylindrical circumferential wall ( 4 c ) which is flush with the cylindrical first seat surface ( 2 a ) and the recess ( 4 b ) being dimensioned in such a way as to accommodate the end section ( 3 *) and the radial first seal ( 6 ) of the first closing element ( 3 ) to form a seal during the opening motion before the second closing element ( 4 ) opens, with closing elements ( 3 , 4 ) which can be transferred independently of one another by a respective partial lift gap-wide into a seat cleaning position for purposes of flushing the seat surfaces ( 2 a , 2 b ) being arranged coaxial relative to each other, the second closing element ( 4 ) by a second partial lift (T 2 ) which acts in the same direction as the opening motion and the first closing element ( 3 ) by a first partial lift (T 1 ) which acts in the direction opposite the opening motion travelling into its respective seat cleaning position, the second closing element ( 4 ) in its closed position with a stop face ( 4 f ) which forms a second circumferential edge (U 2 ) with a circumferential wall ( 4 c ; 4 h ) adjoining the valve housing ( 10 ; 1 a , 1 b ), and directly bordering the first seat surface ( 2 a ), the circumferential wall ( 4 c ) on its end facing away from the first closing element ( 3 ) undergoing transition into a rotationally symmetrical deflection surface ( 4 d ) and this deflection surface ( 4 d ) discharging in a front face ( 4 e ) of the recess ( 4 b ), which face is oriented perpendicular to the longitudinal axis of the second closing element ( 4 ) and, viewed in a vertical center section, the deflection surface ( 4 d ) having a contour (K) which runs without bends, and the direction vector at the discharge point of the deflection surface ( 4 d ) being oriented toward a center discharge bore ( 3 d ; 3 d *) located in the first closing element ( 3 ) without colliding with the first closing element ( 3 ) in the area of its regions enclosing the leakage cavity ( 5 ) to form impact pressure, wherein the stop face ( 4 f ) is located on a boundary surface of the second closing element ( 4 ) which is adjacent radially to the inside to the second seal ( 7 ) and in the closed position of the second closing element ( 4 ) adjoins the second seat surface ( 2 b ), that the second closing element ( 4 ), relative to the second seal ( 7 ), radially outside has a cylindrical circumferential contour ( 4 *), and that the circumferential contour ( 4 *) with an annular cylindrical recess ( 2 d ) in the connection opening ( 2 c ) on the side of the second closing element ( 4 ) forms an annular second throttle gap (D 2 ).