Patent ID: 6666129
Filing Date: 2003-12-23
Classification: F15B,F16K

Abstract:
An operating device for a rotatable closing element of a valve, in particular a rotary drive to which pressurized means may be applied, for a disk or throttle valve consisting of a housing (1) with a pressurized means connection (1c), a piston (2) movable linearly inside the housing and sealed off from a housing jacket (1a), which, when a pressurized means (D) is applied to it, executes a stroke movement against the action of at least one return spring (7), a piston shank (2b) mounted on the piston (2), two helical guide grooves (2f) mounted diametrically opposite each other and introduced into the piston shank (2b), a cover element (4) sealing the housing (1), a central rotating shaft (3) mounted in the cover element (4), a transverse shaft (10) fastened in the rotating shaft (3) and engaged in the guide grooves (2f), two guide rods (6) fastened in the cover element (4), engaging the piston (2) and securing it from twisting, provisions for limitation of an angle of rotation (&phgr;) of the rotating shaft (3) on both sides, and with a stop limiting the stroke of the piston (2) on one side by application of the front-end piston shank (2b) to the cover element (4) and on the other side by application of a piston base (2a) adjoining the piston shank (2b) to a stop element (9; 20; 20.1), characterized in that(a) the guide grooves (2f) are bounded on all sides by the piston shank (2b), (b) the respective course of the grooves (2f) is designed to be exactly or more or less symmetrical at all points, in that each exhibits, in relation to the axis of the piston (2), in a central section (angle &bgr;) a greater angle of inclination than in their two end sections (angle &agr;), (c) and in that the stop element (9; 20; 20.1) is introduced from outside the housing (1) into the housing base (1b) and access to the stop element (9; 20; 20.1) from outside is provided.