Actuating device for a rotatable closure part of a valve

Abstract

The invention relates to an actuating device 1 for a rotatable closure part of a valve 100, in particular a pneumatically or hydraulically actuable rotary drive for a disc valve or throttle flap valve, according to the preamble of claim 1 or 2. The invention is based on the problem of providing an actuating device of the generic type, which actuating device has high stability in the region of the driving connection between the drive piston and drive shaft, the restoring spring of which actuating device is subjected to no additional torsional loading by the walls delimiting it at both sides, and which actuating device has stroke-independent, direct rotational angle limitation with the greatest possible accuracy. This is achieved according to a first solution ° in that the driving connection (4.2.2 / 5.1a; 4.2.2a / 5.1a*) is designed either in the form of a polygonal shaft-hub connection or in the form of a spline hub (4.2.2), which has a straight-toothed spline groove formation (4.2.2a), formed on the drive piston (4), and a shaft head (5.1), which is of complementary design to the spline hub (4.2.2) and which is formed, in the engagement region, as a spline shaft (5.1a) with a spline profile (5.1a*), which shaft head (5.1) forms the end of the drive shaft (5), ° in that the shaft head (5.1) is mounted in a floating fashion in the first housing end surface (2.2) and engages in a floating manner into the driving connection (4.2.2 / 5.1 a; 4.2.2a / 5.1a*) in the drive piston (4), ° and in that the shaft head (5.1), via the means (9) arranged on the first housing end surface (2.2) and in the connecting region between the latter and the housing jacket (2.1), is subjected to stroke-independent direct delimitation of the rotational movement thereof about the axis of rotation (A).

Description

technical field [0001] The invention relates to an actuating device for a rotatable closure of a valve, in particular a pneumatically or hydraulically actuatable rotary drive for a disc valve or a throttle valve, said actuating device having a housing in which In the body there is an axially displaceable and rotatable drive piston that is sealed relative to the cylindrical housing jacket and can be acted upon on one side with a pressure medium, which overcomes the force of at least one return spring when acted upon with a pressure medium The action executes the movement, the drive piston is provided on its outer side with at least one curved guide, into which a cam fixedly arranged on the housing jacket engages, the drive piston on its inner side between itself and the drive shaft There is an anti-rotation and a driving connection with axial freedom of movement, and the operating device has a first housing end surface passing through the housing coaxially with the housing oute...

AI Technical Summary

Problems solved by technology

In two rotary drives, however, the drive piston is guided against rotation so that it can only perform translational movements

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