Patent ID: 8469055
Filing Date: 2013-06-25
Classification: F16K,Y10T

Abstract:
1. A device ( 100 ) for driving a double seat valve ( 1 ) with first and second closing elements ( 3 , 4 ), arranged in series and displaceable with respect to each other, which in the closed position of the double seat valve ( 1 ) prevent the overflow of fluids from a first valve housing part ( 1 a ; 1 b ) into a second valve housing part ( 1 b ; 1 a ) through a connection opening ( 2 c ) connecting said first and second valve housing parts ( 1 , 1 b ) of a valve housing ( 10 ) with each other, and which in the closed position as well as in the open position of the double seat valve ( 1 ) limit a leakage cavity ( 9 ) that is connected to an exterior of the double seat valve ( 1 ), with an axially displaceable, annular slide part ( 5 ), which in the closed position as well as in the open position of the double seat valve ( 1 ) is sealingly received radially at an outer side in a third seating area ( 2 b ) formed in the connection opening ( 2 c ) and which at an inner side forms a first seating area ( 5 e ) which runs coaxially to the connection opening ( 2 c ) and is in fluid communication connected with the connection opening ( 2 c ), wherein in the closed position, the first closing element ( 3 ) is sealingly received in the first seating area ( 5 e ) and during its opening movement generated by the device ( 100 ) sealingly abuts the second closing element ( 4 ), which is associated to a second seating area ( 2 a ) realised in the connection opening ( 2 c ) and which is realised greater in diameter than the first closing element ( 3 ), and the first closing element ( 3 ) is also transferred into an open position (H) in the further opening movement, with seat cleaning positions for the first and second closing elements ( 3 , 4 ) and the annular slide part ( 5 ), each generated by the device ( 100 ) for rinsing their coaxial seating areas ( 5 e , 2 a , 2 b ), wherein the second closing element ( 4 ) is adapted to be transferred into its respective seat cleaning position by a second partial stroke (T 2 ) in the direction of the opening movement, and the slide part by a first partial stroke (T 1 ) directed opposite to the opening movement, with telescopically interlacing first, second and third displacement rods ( 3 a , 4 a , 5 a ) guided outwardly out of the valve housing ( 10 ) and into the device ( 100 ) at the side of the first closing element ( 3 ), wherein the first displacement rod ( 3 a ) is associated to the first closing element ( 3 ), the second displacement rod ( 4 a ) to the second closing element ( 4 ) and the third displacement rod ( 5 a ) to the slide part ( 5 ), wherein the device ( 100 ) comprises inside a housing ( 101 / 102 ) a pot-shaped first drive piston ( a second drive piston ( a sleeve-shaped fourth drive piston ( and a third drive piston ( wherein the second drive piston ( 104 ) is adapted to be axially displaceable in a limited manner in both directions with respect to the first drive piston ( 103 ) and in each case against the force of the second spring ( 108 ), wherein the first and the second drive pistons ( 103 , 104 ) partially limit a first pressure medium volume ( 120 ) pressurised by a first flow (D 1 ) of pressure medium, and wherein the second and the fourth drive piston ( 104 , 106 ) by their front surfaces each facing away from the first drive piston ( 103 ) partially limit a second pressure medium space ( 121 ) pressurised by a second flow (D 2 ) of pressure medium and each move in the direction towards the first drive piston ( 103 ).