Patent ID: 6186163
Filing Date: 2001-02-13
Classification: F16K,Y10T

Abstract:
Double seat valve with means for preventing leakage, particularly for the food and beverage industry, which has a housing having two valve disks (6, 7) that cooperate with one another and define a leakage space (10) which opens out into the open via lines (11), a shared drive unit being provided for the actuation of the two valve disks (6, 7), the drive unit containing a cylinder (17) with a first work piston (18) which is loaded at both sides by pressure springs (29, 22) and is fixedly connected with a valve shaft (13) of the lower valve disk (7), the valve shaft (13) penetrating the upper valve disk (6) and its tubular shaft (14) in a telescoping manner, the shaft, in turn, projecting into the cylinder (17) by its upper end and having an abutment (28) for the lower pressure spring (29) which presses the upper valve disk (6) into its seat (8), and a second work piston (36) which acts on the tubular shaft and is movable on the tubular shaft is arranged under the first work piston (18) in the cylinder (17), and a third work piston (30) which acts on the lower valve disk is arranged above the first work piston, characterized in that the first spring (22) is arranged so as to be supported at the third piston (30).