VALVE ARRANGEMENT, IN PARTICULAR FOR PNEUMATIC CONTROL SYSTEMS

摘要

The invention concerns a valve arrangement, in particular for use in pneumatic control systems. Since pneumatically actuated adjusting components have a given leak rate, the control valve (pilot valve) has to remain permanently in the open state in order to maintain the adjusting component in the deflected position, which requires high retaining capacities. In contrast, the valve arrangement according to the invention requires energy only for switching from one state to the other and can maintain the selected state without power. This is achieved by means of an inlet valve and an outlet valve, at least the inlet valve being a microvalve having a rest position in addition to the open and closed positions. In the rest position there is a gap between the closure member and the microvalve seat. The dimensions of the gap are such that the leak rate of the adjusting component is equalized by gas flowing through the gap. No energy is consumed in the rest position, which the valve adopts when no external forces are applied. In a particular configuration, the valve closes automatically when a specific differential pressure is applied.