Bbc Brown, Boveri & Company, Limited

Asea Brown Boveri Inc.

Bbc Brown Boveri Ag

Heinrich Lageder

Kamil Prochazka

Jaroslav Masek

Karel Skala

Jan Ramisch

In a quick-action flap, in which opening occurs by means of hydraulic actuation and closing can be initiated by a spring, two independent systems are provided, namely a servo system. (1) and a flap disk system (2), which are connected to one another via a coupling (1a, 2a). The coupling itself has, between the coupling part (1a) on the servo side and the coupling part (2a) on the flap disk system side, a free-wheel which makes it possible for the forces occurring upon impact of the flap disk (14) on the seating ring in the flap casing (9) to be divided up in accordance with the kinetic energy of the moving masses of each system (1, 2). The free-wheel thus distributes the stressing over two successive impacts, whereby the stress in the lever (12) of the flap disk (14) is reduced by approximately one half. A hydraulic brake in the servo system (1) ensures that the closing speed of the flap disk is kept constant approximately in the last third of the closing process.

Quick-action flap

In an actuating drive for valves, the stroke motion of the servo piston has to be transmitted to the return sleeve in the control block, so that this results in that hydraulic feedback which restores the equilibrium at the servo piston. By means of a lever or a single-point mounting, this same stroke motion is directly transmitted to a pin attached in an eccentric position relative to the center axis of the return sleeve and transmitted from this pin to the return sleeve adjoining thereunder.

Return mechanism of an actuating drive

To generate a prestress between a piston rod (1) and a valve spindle (2), a bar (5) is incorporated in the piston rod (1) and is prestressed against the valve spindle (2) by exerting a pressure force, which absorbs the pulling and pushing forces occurring there.

Device for generating a prestress when two connection parts are coupled

In a spring suspension of an actuating piston, essentially consisting of a spring plate, a control spring acting on the spring plate and a nut as connection between actuating piston and spring plate, an intermediate underlay (5) is arranged between spring plate (2) and nut (4). The supporting surfaces of the intermediate underlay (5) with respect to the spring plate (2) and the nut (4) are formed by several mutually offset rolling elements (6a, 6b).

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Wurenlingen, Switzerland

Heinrich Lageder