Patent ID: 7757714
Filing Date: 2010-07-20
Classification: F15B,Y10T

Abstract:
1. A Two-stage servo-valve, comprising: a first stage, including four flow resistances arranged in a bridge circuit, wherein at least one flow resistance is a variable flow resistance, a first switching point connected to an air inlet and a second connected to an air outlet, and a third switching point connected to a fourth switching point via a magnetic valve, wherein a differential pressure is provided between the third and fourth switching points; and a second stage, including: a control piston actuated based upon a differential pressure between the third and fourth switching points such that the magnetic valve is closed in a driven state and open in an unconnected state, whereby the third and fourth switching points are pneumatically interconnected, and a three-way valve arranged between the air inlet and the air outlet, the three-way valve controlled via the control piston.