Patent ID: 8528584
Filing Date: 2013-09-10
Classification: F16K,Y10T

Abstract:
1. A drive device for a double seat valve comprising in a valve chamber between flow paths, a seat and first and second valve disks linearly adjustable relative to each other and together relative to the seat, the drive device comprising: a drive device housing; a first piston; a second piston; and a third piston, wherein the first, second, and third pistons are provided in the drive device housing and are movable in a sealed manner by alternating pressure pulses with a pressure medium for initiating an opening cycle of both valve disks, a cleaning cycle of the first valve disk, and a cleaning cycle of the second valve disk, wherein the pistons can be selectively connected with at least one of two couple elements connected to the first and the second valve disks so as to transmit movements, wherein two or more pressure transmission paths lead into the drive device housing to chambers defined by the pistons, wherein the second piston is guided in a sealed manner, separated from the first piston, in the drive device housing containing the first piston, wherein sealing areas of the first and the second pistons define a first chamber and a second chamber in the drive device housing, and wherein, for the cleaning cycle of the second valve disk, at least one pressure transmission path leads laterally and transversely to a common axis of the drive device housing and the valve chamber into the drive device housing and directly at least into the first chamber.