Two-stage servo-valve

A two-stage servo-valve has a first stage in which four flow resistances are arranged in a bridge circuit. At least one of the flow resistances is variable, and two opposite switching points of the bridge circuit are connected to an air inlet and to an air outlet respectively. A differential pressur...

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Bibliographische Detailangaben
1. Verfasser:	MEINHOF ANDRE-HEINRICH
Format:	Patent
Sprache:	eng
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR DEVICES FOR VENTING OR AERATING ENGINEERING ELEMENTS AND UNITS FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING ORCONTROL PURPOSES FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TAPS THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	A two-stage servo-valve has a first stage in which four flow resistances are arranged in a bridge circuit. At least one of the flow resistances is variable, and two opposite switching points of the bridge circuit are connected to an air inlet and to an air outlet respectively. A differential pressure of variable size and sign is provided between the two other switching points. The servo-valve also has a second stage in which a control piston which can be actuated by the differential pressure is arranged and controls a three-way valve. In order to enable the current position of a process valve driven by the servo-valve to be maintained by the most simple means in the event of a power failure, the switching points which provide the differential pressure are interconnected by a magnetic valve which is closed in the driven state and open in the unconnected state, thus pneumatically interconnecting the switching points.