Patent ID: 6179003
Filing Date: 2001-01-30
Classification: F16K,Y10T

Abstract:
Actuating device for a double seat valve with cleanable seat provided with two individually movable closure members (4, 5), of which one member is an independently actuated closure member (4) that comes to rest against the other member (5) after a partial stroke and, during further opening movement, transfers said other member also to an open position, and which, in addition to the open position, may independently be brought to a partly open position, with an actuating mechanism (1) having a main adjustment mechanism (1a) and first and second individual adjustment mechanisms (1b, 1c) associated with the respective closure members (4,5), the individual adjustment mechanisms (1b, 1c) being located between the main adjustment mechanism (1a) and a valve housing (2) and being engaged with adjusting rods (4a, 104; 5a, 105) of the closure members (4,5) via a first piston and a second piston, which are moveably supported on the adjusting rods in one direction and can be brought into an entrainment connection with the adjusting rods in the opposite direction, with the first piston (107) of the first individual adjustment mechanism (1b) for the partly open position (T1) of the independently actuated closure member (4), which is externally arranged in a drive housing (100) of the actuating mechanism (1) in a sealing and movable manner, and with the second piston (108) of the second individual adjustment mechanism (1c) for the partly open position (T2) of the dependently actuated closure member (5), which is arranged in a sealing and moveable manner externally in a cylindrical recess (107a) of the first piston (107), which is facing the main adjustment mechanism (1a), and internally directly or indirectly on the associated valve rod (105), characterised in thatan additional piston (108*) is arranged between the first piston (107) and the valve housing (2), which is externally supported in the drive housing (100) in a sealed and moveable manner, and is internally rigidly connected to the second piston (108),that the first piston (107) is supported in a sealed and moveable manner internally on the assembly (108, 108*) comprising the second piston (108) and the additional piston (108*), andthat the second piston (108) and the additional piston (108*) are acted upon by a pressure medium in the same direction.