Patent ID: 9423035
Filing Date: 2016-08-23
CPC Classification: F16K,Y10T

Claim Text:
1. A double seat valve having a drive ( 70 ) for switching the valve, the valve having a first ( 3 ) and a second closing element ( 4 ) within a valve housing that are movable independently of each other, wherein the first and second closing elements ( 3 , 4 ) enclose a leakage cavity ( 5 ) that is connected to a surrounding area of the double seat valve ( 1 ), wherein the first closing element ( 3 ) after a partial stroke comes into abutment with the second closing element ( 4 ) and transfers the second closing element ( 4 ) by its further opening movement into an open position (H), adjusting rods ( 3 a , 4 a ) for the closing elements ( 3 , 4 ) being provided, wherein a first adjusting rod ( 3 a ) is arranged inside a second adjusting rod ( 4 a ), which are extended from the valve housing ( 2 ) outwards into a drive ( 70 ), and via which the closing elements ( 3 , 4 ), in addition to the fully open position (H) of the closing elements, are adjustable independently of each other, in that the first closing element ( 3 ) is movable selectively into a first partial opening (T 1 ) and the second closing element ( 4 ) is movable selectively into a second partial opening (T 2 ), wherein the open position (H) is generated by a main adjusting arrangement ( 200 ), and the first partial opening (T 1 ) is generated by first and second individual adjusting arrangements ( 300 , 400 ) assigned to the respective closing elements ( 3 , 4 ), the individual adjusting arrangements ( 300 , 400 ) being arranged on the one hand between the main adjusting arrangement ( 200 ) and the valve housing ( 2 ) and on the other hand being arranged together with the main adjusting arrangement ( 200 ) in a housing ( 71 ) of the drive ( 70 ), the drive having a first drive piston ( 74 ) for the main adjusting arrangement ( 200 ) that engages in the direction of the associated fully open position (H), the first adjusting rod ( 3 a ) being connected to the first closing element ( 3 ) against the force of a spring ( 96 ), and the drive having an additional drive piston ( 80 ) for the second of the individual adjusting arrangements ( 400 ) for actuation of the second closing element ( 4 ), the additional drive piston ( 80 ) being adapted to be brought in engagement with the second adjusting rod ( 4 a ) of the second closing element ( 4 ), when moved into the second partial opening (T 2 ), the first drive piston ( 74 ) on the side thereof facing the valve housing ( 2 ) being delimited by a first pressure medium chamber ( 82 ) for generating the fully open position (H), and on the side of the additional drive piston ( 80 ) facing away from the first pressure medium chamber ( 82 ), a second pressure medium chamber ( 86 ) being provided for generating the second partial open position (T 2 ), wherein: the first drive piston (