Patent ID: 6047730
Filing Date: 2000-04-11
Classification: F16K,Y10T

Abstract:
An actuating device for double seat valves with two individually movable closure members (4, 5), including an independently actuated closure member (4) and a dependently actuated closure member (5), the independently actuated closure member coming to rest against the dependently actuated closure member (5) after a partial stroke and, as the independently actuated closure member opens, the independently actuated closure member transfers the dependently actuated closure member (5) to an open position, and the two individually movable closure members (4, 5), in addition to an open position, are each transferable independently of each other to a partly open position, the actuating device having a main adjusting mechanism (1a) and first and second individual adjustment mechanisms (1b, 1c) associated with the closure members (4, 5), the main adjusting mechanism and the first and second individual adjustment mechanisms all being in a common drive housing, the individual adjustment mechanisms (1b, 1c) being mounted between the main adjustment mechanism (1a) and the valve housing (2) and engaging adjusting rods for the closure members (4, 5), a respective piston (107, 108) being mounted on an associated one of the adjusting rods, each piston being axially movable in one direction on the associated adjusting rod and, in an opposite direction, being transferable to engagement with an entrainment connection with the associated adjusting rod, whereinthe piston (107) of the first individual adjustment mechanism (1b) for the partly open position (T1) of the independently actuated closure member (4) is movably mounted so as to be sealed externally in the drive housing (100) of the actuating device (1),the piston (108) of the second individual adjustment mechanism (1c) for the partly open position (T2) of the dependently actuated closure member (5) is in turn mounted movably so as to be sealed externally in a cylindrical recess (107a) in the piston (107) of the first individual adjustment mechanism (1b), the cylindrical recess facing the main adjustment mechanism (1a).