Abstract: Disclosed is an ultrasonic transducer including: at least one piezoelectric wafer having two parallel planar main faces: a front face and a posterior face; at least one posterior plate having two parallel planar main faces: an anterior face and a rear face, the anterior face of the posterior plate extending facing, and in contact with, the posterior face of the piezoelectric wafer. The posterior plate has a thickness between three and seven times the thickness of the piezoelectric wafer. The posterior plate has an acoustic impedance between 10 MPa·s·m?1 and 35 MPa·s·m?1. Also disclosed is a method for assembling such a transducer as well as a flowmeter including at least one such transducer.

Abstract: Disclosed is a valve including: a body; a closure member; and a closure member control rod, the control rod extending inside the body at least partially within a fluid flow area. The control rod includes, in the fluid flow area, at least one flowmeter including: a tubular body having two axial ends; a flow measuring device supported by the tubular body and associated with the tubular body so as to enable a flow of fluid flowing outside the tubular body to be measured, and the electrical connection; and an electrical connection extending outside of the tubular body and passing through the tubular body by at least one fluid-tight passage.