DIAPHRAGM-SEALED DOUBLE-SEAT VALVE AND DRIVE

摘要

The invention relates to a double-seat valve, comprising a first closing element (14), which is associated with a first valve seat (34), a second closing element (16), which is associated with a second valve seat (40), a hollow rod (20), which is connected to the second closing element, a valve rod (18), which is connected to the first closing element and is arranged extending through the hollow rod, a first diaphragm (44), which is fastened to the hollow rod and to a housing (2) of the double-seat valve, and a second diaphragm (56), which is arranged so as to seal a channel (58) between the valve rod and the hollow rod, the second closing element comprising an annular body (72), which is connected in a connection region (120) to a supporting section (68), the annular body and the supporting section being designed to clamp the second diaphragm and the connection region being sealed to the second diaphragm and to a gap seal (78) against an interior (54). In order to simplify the design and to ensure reliable function under hygienic conditions, according to the invention, the supporting section has a leakage channel (122), which forms a section of a fluid connection between the connection region and the channel.