Patent ID: 6892745

Claim:
A valve for measuring and controlling a fluid flow parameter, comprising: a valve assembly having an inlet, an outlet, and a passageway therebetween; a variable area flow orifice mounted in the passageway; a differential pressure sensor operable to sense a differential pressure across the variable area flow orifice and supply a differential pressure signal; an upstream conduit having an inlet coupled to the passageway upstream of the variable area flow orifice and an outlet coupled to the differential pressure sensor; a downstream conduit having an inlet coupled to the passageway downstream of the variable area flow orifice and an outlet coupled to the differential pressure sensor; a flow venturi coupled to the downstream conduit inlet and positioned proximate the variable area flow orifice; a pressure sensor coupled to the passageway, the pressure sensor operable to sense fluid pressure within the passageway and supply a fluid pressure signal; a temperature sensor coupled to the passageway and operable to sense fluid temperature and supply a fluid temperature signal; a position sensor operable to sense a position of the variable area flow orifice and supply a position signal; and a processor coupled to receive the differential pressure signal, the fluid pressure signal, the fluid temperature signal, and the position signal and operable to determine the fluid flow parameter in the passageway therefrom.