Flow regulator

摘要

The present invention concerns a flow regulator for gaseous substances, particularly a flow regulator intended for air in air-conditioning and ventilation installations, for maintaining the volumetric flow of the gaseous substance at desired magnitude with sufficient accuracy when the differential pressure acting across the flow regulator varies within given limits. The flow regulator comprises an envelope and a regulating member turnably disposed in the flow passage confined by the envelope. The torque produced by the flow of gaseous substance on the regulating member and on the other hand a countertorque dependent on the position of the regulating member cause the regulating member turning in the flow passage to assume a position of equilibrium such that the requisite pressure drop is obtained for maintaining the volumetric flow rate at predetermined magnitude. The regulating member is substantially slightly curved at least in the flow surface facing the incoming flow of the gaseous substance. The turning angle between the initial and ultimate positions of the regulating member is substantially the same at volumetric flows of different magnitudes when the differential pressure range is the same. The initial and ultimate positions of the regulating member are dependent on the magnitude of the volumetric flow when the differential pressure is the same.