Abstract: A positive displacement fluid machine comprises a body including a circular cylindrical cavity with two closed ends and two port openings respectively open to the two opposite halves of the cylindrical cavity respectively located on two opposite sides of a plane of symmetry, a vane assembly including a plurality of vanes disposed in a radially extending pattern from a central shaft rotatably and pivotally supporting the plurality of the vanes, which vane assembly is disposed within the circular cylindrical cavity in a coaxial relationship therebetween wherein the radial edges of the vanes slide on the circular cylindrical wall of the cylindrical cavity, and a cam follower-guide mechanism controlling separation angle between adjacent vanes in such a way that the separation angle between adjacent vanes increases from a minimum value to a maximum value in one of the two opposite halves of the cylindrical cavity and decreases from the maximum value to the minmum value in the other of the two opposite halves of th

Abstract: An electronic filter for conditioning a primary flow signal including alternating electrical signals generated in a flowmeter comprises a parallel bank of low frequency bandpass filters and high frequency bandpass filters, wherein the switching on or off of the individual low frequency bandpass filters is controlled by a command signal generated from an auxiliary flow signal provided by an accessory flowmeter supplying a crude but stable signal representing the level of fluid flow, and the switching on and off of the individual high frequency bandpass filters is controlled by a command signal generated from the frequency of the primary flow signal providing a highly accurate and extremely sensitive signal that represents the time rate of fluid flow.

Abstract: An inertia force mass flowmeter comprises a conduit with two opposite extremities restrained from experiencing lateral movement including a first end section extending in over-hanging relationship from one of the two restrained extremities of the conduit, a second end section extending in over-hanging relationship from the other of the two restrained extremities of the conduit, and a looped midsection connecting the first and second end sections to one another, wherein a first elongated support extending from a restrained extremity thereof towards the first end section of the conduit supports the over-hanging extremity of the first end section of the conduit, and a second elongated support extending from a restrained extremity thereof towards the second end section of the conduit supports the over-hanging extremity of the second end section of the conduit; wherein an electromagnetic vibrator generates a relative flexural vibration between a combination of a first half of the conduit and the first elongated su

Abstract: A flowmeter comprises an output cut-off circuit controlled by a command signal generated by a flow switch, wherein the flow switch generates a command signal switching on the transmission of an electrical signal representing the flow rate of media to an output terminal, when the flow rate of media being measured by the flowmeter is greater than a preset threshold value, and switches off the transmission of the electrical signal representing the flow rate of media to the output terminal, when the flow rate of media is less than the preset threshold value.

Abstract: A magnetic flowmeter provides a first alternating electrical signal with at least a portion thereof comprising a first electromotive force generated by an electromagnetic interaction between an alternating magnetic field and the velocity of an electrically conductive fluid moving transversely across the alternating magnetic field, wherein the first electromotive force varies as a function of the velocity of the electrically conductive fluid, and a second alternating electrical signal with at least a portion thereof comprising a second electromotive force generated by an electromagnetic induction from the alternating magnetic field and other ambient electromagnetic field, wherein the second electromotive force is independent of the velocity of the electrically conductive fluid, and determines the velocity of the electrically conductive fluid as a function of a phase angle difference between the first and second alternating electrical signals.

Abstract: A gasket seal comprises a hollow metallic annular member with hollow interior filled with a thermally expanding material and exterior surface surface thereof lined with a resilient layer of sealing material; wherein the contact pressure between the resilient layer of sealing material and metallic surfaces sealed by the gasket seal, that is imposed by the fastening employed in joining the metallic surfaces, provides the sealing under normal conditions, while the additional contact pressure exerted by the thermal expansion of the thermally expanding material contained in the hollow metallic annular member as a result of an elevated temperature provides the sealing in case of fire.

Abstract: A mass flowmeter comprises a nonvibrating conduit providing a flow passage divided into two parallel and equal subpassages by a planar member with the leading and trailing edges secured to the wall of the flow passage, wherein the planar member is torsionally vibrated about the central axis thereof substantially coinciding with the center line of the flow passage, and a pair of vibration sensors detecting the torsional vibration of the planar member respectively at two different cross sections of the flow passage, wherein the mass flow rate of media moving through the flow passage is determined as a function of a phase angle difference between two alternating electrical signals respectively provided by the pair of vibration sensors.

Abstract: A mass flowmeter comprises a conduit with two extremities secured to a support, which conduit includes a first and second end sections extending from the respective secured extremities thereof in a cantilever-like arrangement and a looped mid section of 360 degree loop angle connecting the first and second end sections of the conduit to one another, an electromagnetic vibrator inducing a relative flexural vibration between the two opposite halves of the conduit in directions approximately perpendicular to the looped midsection of the conduit, and a pair of vibration sensors respectively measuring the flexural vibration of the conduit at two sections respectively belonging to the two opposite halves of the conduit, wherein the mass flow rate of media moving through the conduit is determined as a function of difference in the flexural vibration between the two opposite halves of the conduit such as the phase angle difference between the two vibrations respectively measured by the two vibration sensors.

Abstract: A method for determining mass flow rate of media moving through at least one conduit under a flexural vibration comprises obtaining two alternating electrical signals respectively representing the flexural vibration of the conduit at two different sections of the conduit, and determining mass flow rate of media as a function of the ratio of a value of one of the two alternating electrical signals measured at an instant when the other of the two alternating electrical signals reaches a zero value to the amplitude of said one of the two alternating electrical signals.

Abstract: A Coriolis force mass flowmeter comprises a single conduit with two fixed extremities including two end sections respectively extending from the two fixed extremities of the conduit in over-hanging relationship and a looped midsection connecting the two end sections of the conduit to one another in a configuration symmetric about a center plane perpendicularly intersecting with the center section of the conduit and dividing the conduit into two equal opposite halves, wherein an electromagnetic vibrator generates a flexural vibration of the conduit in a symmetric mode about the center plane and two vibration sensors measure the flexural vibration of the conduit at two locations located symmetrically about the center plane, and the mass flow rate of media moving through the conduit is determined as a function of a difference between two flexural vibrations respectively measured by the two vibration sensors.

Abstract: A compound electronic filter for conditioning an alternating electrical signal generated by vortex shedding in a vortex flowmeter has a first stage filter comprising a first plurality of electronic filters respectively including a first plurality of electronic switches and a second stage filter comprising a second plurality of electronic filters respectively including a second plurality of electronic switches, wherein the first plurality of electronic switches switching on and off the first plurality of electronic filters one at a time are controlled by a first command signal generated from the frequency of the output signal from the first stage filter, and the second plurality of electronic switches switching on and off the second plurality of electronic filters one at a time are controlled by a second command signal generated from the frequency of the output signal from the first stage filter.

Abstract: A conduit included in a Coriolis force mass flowmeter has two generally straight end sections with central axes disposed on a first plane and respectively extending from two secured extremities of the conduit, and a curved midsection with central axis disposed intermediate two parallel planes perpendicular to the first plane and respectively including the central axes of the two generally straight end sections, which curved midsection connects the two generally straight end sections to one another, wherein an electromagnetic vibrator vibrates the two generally straight end sections relative to one another, and a pair of motion sensors respectively measure flexural vibrations of the two opposite halves of the curved midsection of the conduit.

Abstract: A pressure sensor comprises a pair of pressure compartments with deflective end walls and an elongated displaceable member with two extremities respectively anchored to the deflective end walls of the two pressure compartments, and a capacitor with first series of capacitor plates affixed to the elongated displaceable member and a second series of capacitor plates disposed in an alternating arrangement with the first series of the capacitor plates and affixed to a stationary member, wherein the pressure difference between the two pressure compartments displaces the elongated displaceable member in axial directions thereof and changes the capacitance value between the first and second series of capacitor plates and, consequently, the numerical value of the differential pressure is determined as a function of the measured value of the capacitance.

Abstract: An electrical signal generated by a transducer included in a vortex sensor and conditioned by a preamplifier is supplied to a pair of parallel electronic filters respectively inhibiting transmission of the electrical signals with frequencies in a low and high ranges devided by a reference frequency, wherein a frequency detector detects the dominant frequency of the electrical signal and puts out control inputs depending on the dominant frequency of the electrical signal to two switches respectively controlling transmission of the electrical signal through the pair of parallel electronic filters; wherein the control input closes only one of the two switches depending on values of the dominant frequency of the electrical signal relative to the reference frequency in such a way that the electrical signal with frequencies in the low range is transmitted without the transmission of the high frequency noise and the electrical signal with frequencies in the high range is transmitted without the transmission of the l

Abstract: A rotary pump-motor-meter comprises a rotor assembly including a shaft (38) and one or more hub members (37) coaxially affixed to the shaft, that supports a plurality of flaps (40) disposed about the shaft (38), each of which flaps has a round first edge and a crescent trailing edge and is supported by the hub member (37) pivotably about a pivot axis coinciding with the center of the round first edge disposed adjacent to the shaft (38), which rotor assembly is rotatably disposed within a cylindrical cavity with two port openings in a parallel and eccentric relationship, wherein one or more circular cam guides disposed adjacent to the rotor assembly in a rotable arrangement about a cam axis guides a plurality of cam rollers (41), each of which cam rollers is anchored to one end face of the flaps (40).

Abstract: The convective inertia force of media moving through a laterally vibrating conduit with two extremities restrained from lateral displacement is measured as a measure of the mass flow rate of media moving through the conduit by a method; wherein the flexural vibration of the conduit is measured at the midsection and another section intermediate the midsection and one of the two extremities of the conduit, and the convective inertia force is determined as a function of ratio between two values of the flexural vibration of the conduit at said another section of the conduit respectively measured at two instants when absolute value of the flexural vibration at the midsection of the conduit reaches respectively the maximum and minimum values during at least one cycle of the flexural vibration of the conduit, or as a function of phase angle difference in the flexural vibration of the conduit between the midsection and said another section of the conduit.

Abstract: A magnetic induction flowmeter has a time-varying magnetic field imposed across the flow passage, and a first and second pairs of electrodes disposed respectively on a first plane dividing the cross section of the flow passage into two equal opposite halves and a second plane offset from the first plane wherein the two electrodes belonging to each pair of electrodes are respectively affixed to the two diametrically opposite sides of the wall of the flow passage, wherein the flow rate of electrically conductive media moving through the flow passage is determined as a function of a differential combination of the electromotive force between the first pair of electrodes and the electromotive force between the second pair of electrodes.

Abstract: A positive displacement fluid handling apparatus comprises a body including a circular cylindrical cavity with two closed ends and two port openings respectively open to the two opposite halves of the circular cylindrical cavity; a flap assembly including a plurality of flaps disposed in the circular cylindrical cavity in a radiating pattern and supported by the body rotatably about a first axis of rotation concentric to the circular cylindrical cavity in an independently rotatable arrangement, wherein the outer radial edges of the flaps slide on the circular cylindrical wall of the circular cylindrical cavity and the inner radial edges of the flaps are assembled in a radially converging leak-proof assembly; and a flap spacer assembly including a plurality of rollers or spacers disposed on a circular cylindrical surface enclosing the first axis of rotation and coaxial to a second axis of rotation eccentric to the circular cylindrical cavity and supported by the body rotatably about the second axis of rotation

Abstract: A positive displacement fluid handling apparatus comprises a pair of cylindrical cavities with circular cylindrical walls connected to one another by a connecting flow passage and respectively open to an inlet and an outlet flow passages, wherein each of the two cylindrical cavities includes a hub coaxially and rotatably disposed therein and a vane radially extending from the hub to the circular cylindrical wall of the cylindrical cavity, and a hollow circular cylindrical shell encircling the hub disposed eccentrically therein tangentially to the cylindrical wall of the cylindrical cavity and rotatably about the central axis of the hollow circular cylindrical shell that includes an axially disposed slit engaged by the vane in a sliding relationship; wherein the rotating motions of the two hubs respectively included in the two cylindrical cavities are positively coupled to one another in such a way that the two vanes respectively included in the two cylindrical cavities revolve at the same speed and the radial

Abstract: A flowmeter comprises a first electrode disposed on a first cross section of the flow passage and a second electrode disposed on a second cross section of the flow passage downstream of the first cross section, and an alternating electric power supply providing an alternating electric potential difference across the first and second electrodes, that creates flow of electric current across the first and second electrodes in two opposite directions, wherein the fluid velocity is determined as a function of difference between the electric current flowing from the first electrode to the second electrode and the electric current flowing from the second electrode to the first electrode.