Patent ID: 6065492
Filing Date: 2000-05-23
Classification: G01F,Y10T

Abstract:
A gas mass flow metering valve, comprising an entry duct, an exit duct, a valve element having an exit port, a seal ring cooperating with said valve element, said seal ring being made to rotate by operating means, and means for measuring the pressure upstream and downstream of the valve element and the valve gas temperature, characterised in that fluidly coupled to said entry duct is a flow straightener, immediately downstream of which, within the valve body, there is positioned the upstream pressure measuring means, said entry duct being prolonged by a prolongation tube into the interior of the valve element to a point proximate the convergence region in correspondence with said exit port through an aperture in the valve element opposite said exit port, said valve element exit port having an edge geometry including a converging curvature arranged to convey the gas flow in a direction substantially parallel to the axis of the exit duct, which is provided in its interior with a flow stabilizer, the downstream pressure measuring means being positioned within the valve upstream of said flow stabilizer, proximate said exit port.