Abstract: Contaminate-sequestering coatings including a network of hydrolyzed silane compounds including a plurality of thiol functional groups, a plurality of fluorinated functionalities, or both are provided. The contaminate-sequestering coatings may sequester one or more per- and polyfluoroalkyl substances (PFAS), heavy metals, biological species or any combination thereof. Methods of functionalizing a substrate surface with contaminate-sequestering functionalities that sequester one or more PFAS, heavy metals, or both are also provided. Methods of removing contaminants from contaminate-containing liquids, and devices including the contaminate-sequestering coatings are also provided.

Abstract: A gas meter with a rated maximum flow capacity of greater than 3,000 CFH (Cubic Feet per Hour)—for example, between 3,500 CFH and 7,000 CFH—is provided with 2-inch flange connectors. One or more undercuts are provided in the meter body to promote satisfactory performance in terms of, for example, differential pressures at the meter inlet and outlet.

Abstract: A hot melt adhesive system includes an adhesive supply for receiving solid or semi-solid hot melt adhesive, and a heater associated with the adhesive supply for melting the solid or semi-solid hot melt adhesive into liquid hot melt adhesive. An adhesive tracking system monitors an output of the liquid hot melt adhesive, and includes a flow meter having a flow inlet and a flow outlet. The flow meter measures an amount of the adhesive flowing out of the flow outlet. A product detector may be used to sense a presence of a product to which the adhesive is applied. A controller then determines the total amount of the liquid adhesive dispensed and the average amount of liquid adhesive dispensed per product.

Abstract: This disclosure provides, among other things, a cartridge comprising: (a) a cartridge body comprising a malleable material and having, disposed on a surface of the body, at least one valve body comprising a valve inlet and a valve outlet, each fluidically connected to a fluidic channel; and (b) a layer comprising a deformable material bonded to a surface of the cartridge body and sealing the at least one valve body at points of attachment, thereby forming at least one valve; wherein the at least one valve body is depressed in the cartridge body relative to the points of attachment and wherein the deformable material covering the at least one valve body retains sufficient elasticity after deformation such that in a ground state the valve is open.

Abstract: A gas meter with a rated maximum flow capacity of greater than 3,000 CFH (Cubic Feet per Hour)—for example, between 3,500 CFH and 7,000 CFH—is provided with 2-inch flange connectors. One or more undercuts are provided in the meter body to promote satisfactory performance in terms of, for example, differential pressures at the meter inlet and outlet.

Abstract: A flow measuring device for measuring flow of a fluid. A housing has a passage which extends between an inlet and an outlet. A shaft is disposed within the housing and is rotatable about a central axis. A flow detector is mounted on the shaft and disposed at least partially within the passage. The flow detector includes a rotatable, generally cylindrical body that rotates about a central axis as the fluid flows. A magnet is disposed within the housing such that the central axis extends through it, and is configured to rotate simultaneously with the body about the central axis. A magnetic encoder is disposed within the housing and configured to sense rotation of the magnet as the flow detector angularly displaces about the central axis so as to detect angular displacement of the flow detector.

Abstract: A flow meter is disclosed with a hollow blocking rotor. The flow meter includes a housing that has a cavity with an inlet and an outlet. The flow meter also includes a pair of displacement rotors with a blocking rotor disposed between the displacement rotors. The blocking rotor includes a pair of convex walls and a pair of concave walls. The blocking rotor further includes a shaft coupled to the pair of concave walls. Each concave wall is disposed between and coupled to a pair of opposing convex walls. The concave walls provide clearance for rotation of the displacement rotors when the displacement rotors sweep along the concave walls. The hollow configuration of the blocking rotor reduces the impedance of the flow meter.

Abstract: A flow meter is disclosed with a hollow blocking rotor. The flow meter includes a housing that has a cavity with an inlet and an outlet. The flow meter also includes a pair of displacement rotors with a blocking rotor disposed between the displacement rotors. The blocking rotor includes a pair of convex walls and a pair of concave walls. The blocking rotor further includes a shaft coupled to the pair of concave walls. Each concave wall is disposed between and coupled to a pair of opposing convex walls. The concave walls provide clearance for rotation of the displacement rotors when the displacement rotors sweep along the concave walls. The hollow configuration of the blocking rotor reduces the impedance of the flow meter.

Abstract: A positive displacement fluid flow meter comprises a chamber having a fluid inlet and a fluid outlet. A rotor is displaceable within the chamber, rotation of the rotor being related to the volume of fluid passing through the chamber. The chamber has a surface proximate which an end surface of the rotor passes, the chamber surface and/or the rotor end surface having at least one recess to retain at least a portion of debris carried by the metered fluid. The recess is preferably formed so as not to provide fluid, communication, from the inlet to the outlet across the rotor end surface. A lid closes an end of the chamber which in use is subject to the pressure of fluid within the chamber. The lid is engaged at its periphery to a wall of the chamber, and is preferably flexible adjacent its periphery to reduce the transmission of bending stresses between the periphery of the lid and the remainder thereof.

Abstract: A rotary positive displacement flowmeter of the type utilizing two displacement rotors and a blocking rotor with the blocking rotor having a single recess and the displacement rotor cylinders being of substantially similar size as the blocking rotor, resulting in a uniform flowpath through the flowmeter with alignment of the rotor axes in a 180 degree plane.

Abstract: A system and method to detect leaks in the rotating control head and a latching system to latch the rotating control head to a housing is disclosed.

Abstract: A positive displacement fluid flow meter comprises a chamber having a fluid inlet and a fluid outlet. A rotor is displaceable within the chamber, rotation of the rotor being related to the volume of fluid passing through the chamber. The chamber has a surface proximate which an end surface of the rotor passes, the chamber surface and/or the rotor end surface having at least one recess to retain at least a portion of debris carried by the metered fluid. The recess is preferably formed so as not to provide fluid, communication, from the inlet to the outlet across the rotor end surface. A lid closes an end of the chamber which in use is subject to the pressure of fluid within the chamber. The lid is engaged at its periphery to a wall of the chamber, and is preferably flexible adjacent its periphery to reduce the transmission of bending stresses between the periphery of the lid and the remainder thereof.

Abstract: A positive displacement flow measurement device includes a rotor portion positioned inside a casing portion to act as a least area rotor that captures a volume of material and moves the volume of material along the length of the device. The device is coupled to a means for counting the number of revolutions of the rotor portion and/or the casing portion over a predetermined period of time. In one embodiment, the counting means comprises a shaft encoder that measures the angular position of a shaft of the rotor portion and sends a signal to a processor of a computing device that determines the volume of material flowing through the device.

Abstract: An airflow detection apparatus configured to detect airflow of a fan includes a first transistor, an amplifier, an A/D converter, a microprocessor, an indicating circuit, and a stabilizing circuit configured for supplying a stable current to the first transistor. The base and the collector of the first transistor are connected to a power supply. The emitter of the first transistor is connected to the amplifier and the stabilizing circuit. The amplifier receives a voltage signal from between the base and the emitter of the first transistor. The voltage signal is converted into a digital signal by the A/D converter. The microprocessor processes the digital signal and output an indicating signal to the indicating circuit to indicate airflow status of the fan.

Abstract: A water meter has a measurement insert disposed in a meter housing, a measurement display, an intake connection and a discharge connection. An impeller is disposed on a shaft in a measurement insert housing, also referred to as impeller bowl. A first shaft end of the shaft interacts with the measurement display. The meter housing has, on a side facing away from the first shaft end, referred to as a lower side below, recesses or openings for receiving fasteners for fastening a cover, and a calibrating device for adjusting the measurement display. The calibrating device is inserted into at least one of the openings that can be closed by the cover.

Abstract: A water meter has a measurement insert disposed in a meter housing, a measurement display, an intake connection and a discharge connection. An impeller is disposed on a shaft in a measurement insert housing, and a first shaft end of the shaft interacts with the measurement display. A supporting part is disposed between the meter housing and the measurement insert housing. Because of the supporting part, forces, acting in the axial direction of a second shaft end of the shaft through the measurement insert housing, can be absorbed and the forces can be conducted into the meter housing.

Abstract: A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be made incorporating a cast-in-place, mobile monolithic polymer element, disposed within a microchannel, and driven by fluid pressure (either liquid or gas) against a retaining or sealing surface. The polymer elements are made by the application of lithographic methods to monomer mixtures formulated in such a way that the polymer will not bond to microchannel walls. The polymer elements can seal against pressures greater than 5000 psi, and have a response time on the order of milliseconds. By the use of energetic radiation it is possible to depolymerize selected regions of the polymer element to form shapes that cannot be produced by conventional lithographic patterning and would be impossible to machine.

Abstract: A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be made incorporating a cast-in-place, mobile monolithic polymer element, disposed within a microchannel, and driven by fluid pressure (either liquid or gas) against a retaining or sealing surface. The polymer elements are made by the application of lithographic methods to monomer mixtures formulated in such a way that the polymer will not bond to microchannel walls. The polymer elements can seal against pressures greater than 5000 psi, and have a response time on the order of milliseconds. By the use of energetic radiation it is possible to depolymerize selected regions of the polymer element to form shapes that cannot be produced by conventional lithographic patterning and would be impossible to machine.

Abstract: A method for surface modification of microchannels and capillaries. The method produces a chemically inert surface having a lowered surface free energy and improved frictional properties by attaching a fluorinated alkane group to the surface. The coating is produced by hydrolysis of a silane agent that is functionalized with either alkoxy or chloro ligands and an uncharged C3-C10 fluorinated alkane chain. It has been found that the extent of surface coverage can be controlled by controlling the contact time from a minimum of about 2 minutes to a maximum of 120 minutes for complete surface coverage.

Abstract: A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be made incorporating a cast-in-place, mobile monolithic polymer element, disposed within a microchannel, and driven by either fluid or gas pressure against a retaining or sealing surface. The polymer elements are made by the application of lithographic methods to monomer mixtures formulated in such a way that the polymer will not bond to microchannel walls. The polymer elements can seal against pressures greater than 5000 psi, and have a response time on the order of milliseconds. By the use of energetic radiation it is possible to depolymerize selected regions of the polymer element to form shapes that cannot be produced by conventional lithographic patterning and would be impossible to machine.

Abstract: A microvalve having a cast-in-place and lithographically shaped mobile, polymer monolith for fluid flow control in microfluidic devices and method of manufacture. The microvalve contains a porous fluorinated polymer monolithic element whose pores are filled with an electrically insulating, high dielectric strength fluid, typically a perfluorinated liquid. This combination provides a microvalve that combines high dielectric strength with extremely low electrical conductivity. These microvalves have been shown to have resistivities of at least 100 G&OHgr; and are compatible with solvents such as water at a pH between 2.7 and 9.0, 1-1 propanol, acetonitrile, and acetone.

Abstract: A volumetric liquid meter of the oscillating piston type having a chamber, includes a bottom portion, a fixed partition, a piston and a filter. At least one element forming the chamber is formed by at least two materials presenting different mechanical characteristics and is made by a multi-material injection method.

Abstract: A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be made incorporating a cast-in-place, mobile monolithic polymer element, disposed within a microchannel, and driven by fluid pressure (either liquid or gas) against a retaining or sealing surface. The polymer elements are made by the application of lithographic methods to monomer mixtures formulated in such a way that the polymer will not bond to microchannel walls. The polymer elements can seal against pressures greater than 5000 psi, and have a response time on the order of milliseconds. By the use of energetic radiation it is possible to depolymerize selected regions of the polymer element to form shapes that cannot be produced by conventional lithographic patterning and would be impossible to machine.

Abstract: A piston-type quantity meter including a metering chamber having a bottom, a cylindrical chamber shell, a cover, a central journal, a guide ring, two inlet opening formed, respectively, in the chamber bottom and the chamber cover, and a radial outlet opening formed in the chamber shell, an annular piston located in the chamber interior and having a cylindrical piston skirt, guide slot means formed in the piston skirt and corresponding to a width of separation wall located in the metering chamber for pinning the piston on the separation wall, and a radial outlet opening associated with the outlet opening formed in the chamber shell, and a seal strip for sealing at least one of a slit formed between the inner surface of the chamber shell and an outer surface of the annular piston, and a slit formed between the inner surface of the piston and the guide ring.

Abstract: A device for measuring fluid volume output by a pump includes a meter housing having an inlet and an outlet through which the fluid flows. At least two inter-engaging screw spindles are rotatably mounted within the meter housing and are rotatable in response to fluid flow in an axial direction through the housing. An exciter disc is arranged in the fluid flow in the meter housing and connected to one of the at least two inter-engaging screw spindles for rotation therewith. The exciter disc has at least one substantially planar surface and a plurality of magnets circularly arranged thereon with their fields in an axial direction relative to the exciter disc. The meter housing is configured to form a gap and the exciter disc penetrates the gap, whereby a region of the meter housing is in close proximity to and extends over a portion of the planar surface of the exciter disc.

Abstract: A fluid flow meter has a housing within which inlet and outlet displacement rotors flank a blocking rotor. The end plates of the housing rotatably support all three rotors which rotate in a timed sequence in response to the passage of fluid through the meter. The cylindrical blocking rotor has a pair of disk-shaped endwalls joined by a rectangular, centrally-positioned web, and a pair of arcuate sidewalls which, with the endwalls and web define a pair of rotor cavities. Recesses in the housing end plates fit the blocking rotor endwalls and provide an added fluid seal. Use of the rotor endwalls makes it possible to manufacture the blocking rotor with a smaller diameter and thinner body portions, saving weight and rotational mass.

Abstract: Device for measuring liquid volume in the manner of a cylindrical piston meter with a cylindrical measuring chamber with connecting channels running perpendicularly to the cylinder axis of the measuring chamber and with a cylindrical piston inserted eccentrically into the measuring chamber and performing a wobbling movement, said piston having an H-shaped cross section and a through opening for engagement into a separating wall projecting into the measuring chamber, with the characterizing feature that the cylindrical piston is hydraulically tensioned by the inflowing liquid in the measuring chamber and the pressure differential on the outer and inner jacket surfaces of the cylindrical piston tends toward zero.

Abstract: A measuring device for a liquid meter with oscillating piston comprises a hollow chamber pierced with two apertures and limited by a cylindrical side wall, a bottom and a lid; a piston enclosed in said chamber and held movably, along a partition wall about a well. This device further comprises at least one groove, made in the corners formed between the bottom and the side wall of the chamber or the well or the piston, that opens into the hollow of the chamber, in a space formed between the well and the side walls, and is designed to receive deposits of particles introduced into said device by the liquid to be metered. The device can be applied in particular to water metering. FIG.

Abstract: An improved industrial meter housing assembly includes a compactly designed metal housing having a central trefoil shaped chamber and minimal length inlet and outlet ports in fluid communication with the chamber with the ports ending at inlet and outlet port faces on the housing outer surface oriented 90.degree.degrees from each other and 45.degree.degrees to the vertical with the housing in its upright position. The housing may be installed as original equipment in an industrial environment having upstream pipe connections provided to match those input and output port faces. However, the compactness of the housing may be utilized together with a pair of installations-specific inlet and outlet runner pipes to enable the combination meter housing/runners to be substituted for any existing original equipment industrial meter.

Abstract: The invention relates to a high accuracy flowmeter for testing and calibrating flowmeters and the like, and more particularly to a positive displacement flowmeter which may include a cylinder (12), a piston (10) within the cylinder (12) which makes a clearance seal with the inside of the cylinder, an encoder (40) associated with the piston, and a control valve (V) for controlling the supply of a fluid flow (A1) to be measured. More generally, the flowmeter includes a channel for receiving a fluid flow so as to move the piston (10) within its enclosure (12); and a device (36, 38, 40) for detecting movement of the piston and generating electrical signals representative of the fluid flow to be measured. The movement of the piston is detected as a function of a known volume of the enclosure traversed by the piston, and a measured variable elapsed time over which the piston traverses the volume. Preferably, the flowmeter system includes a damping device (FIGS. 6A-6D) which may be mechanical, pneumatic, or fluidic.

Abstract: A speed detector of a scroll-type fluid machine in which a fixed scroll and an orbiting scroll, each of which includes a spiral wrap disposed on the inner surface of an end plate thereof, are engaged with each other and housed in a closed housing, and the orbiting scroll revolves while its rotation is checked by means of an Oldham's ring having the orbiting scroll disposed on the outer surface thereof, wherein the Oldham's ring is formed of a magnetic material, and an electromagnetic induction type revolution signal detecting means is installed in an opposed relationship to the Oldham's ring.

Abstract: In a vortex chamber flow meter, a bearingless annular rotor rotates about an axis in a cylindrical operating chamber. The chamber is enclosed in a jet ring within a meter housing. Liquid enters the housing and flows to a plurality of circumferentially spaced ports in the jet ring, directing flow through conduits into the vortex operating chamber tangentially. Liquid flow exits the vortex chamber axially through a central aperture. Optical sensing means respond to markings on the surface of a rotor moving past a selected position. The meter is constructed to effectively offset the entry of the liquid into the vortex chamber. The centerlines of the ports define a plane which is positioned to be off center from a plane bisecting the vortex chamber in the axial degree of freedom. The offset is in an axial direction away from the exit.

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 device which monitors the through passage of incompressible fluids such as water that relies upon a nutating disk-type transducer associated with a spherical hollow core. The disk includes a spindle which precesses in the presence of a sensor. A display panel is driven by a microcontroller which converts the precession of the spindle to useful output as a function of time whereby the precession correlates with volume flow through the nutating disk transducer.

Abstract: A flowmeter has two moving parts, a rotor with a cylindrical core and the radially extending sinusoidal curving vane. A slider has a gate opening which fits on the vane for reciprocating axially as the rotor turns. The slider and rotor are held within a cavity and slider recess within a case. Fluid is admitted through an inlet opening on one side of the slider and is exhausted through an outlet opening on the other side of the slider. A magnetic pickup on the slider indicates the movements of the slider, and hence the rotation of the rotor and the volume of fluid flowing through the meter.

Abstract: An improved drive shaft for a positive displacement type water meter includes a flexible spring arm formed on one end of the shaft for engaging the drive spindle of a nutating disk measuring element disposed within a water meter. The other end of the drive shaft is connected to a magnetic drive which, in turn, is magnetically coupled to a conventional mechanical register. Under normal conditions, the nutating disk measuring element and drive spindle oscillate in the water meter at a rate proportional to water meter flow. The drive spindle engages the spring arm of the drive shaft causing the drive shaft and magnet to rotate. The magnet is coupled through the water meter casing to a second magnet in the register. Rotation of the second magnet is used to drive the mechanical register to register water consumption. In the event the first magnet within the meter casing becomes frozen to the casing because of external freezing conditions, the drive spindle will snap past the flexible spring arm.

Abstract: A positive displacement apparatus usable as a pump or motor or flowmeter comprises a first revolving vane rotatably disposed in a first cylindrical cavity wherein the edge of the first revolving vane sweeps on a circular cylindrical portion of the cylindrical wall of the first cylindrical cavity, and a second revolving vane rotatably disposed in a second cylindrical cavity wherein the edge of the second revolving vane sweeps on a circular cylindrical portion of the cylindrical wall of the second cylindrical cavity, wherein the rotating motions of the first and second revolving vanes are coupled to one another in such a way that the edge of at least one of the first and second revolving vanes sweeps on respective circular cylindrical portions of the cylindrical walls of the respective cylindrical cavities at all instances, whereby a fluid moving through the first and second cylindrical cavities providing a flow passage in series results in a rotating motion of the revolving vanes and vice versa.

Abstract: A flowmeter has meshing rotors mounted on shafts. The bores of the rotors have plural longitudinally extending grooves which flow materials through the grooves and out of the bores to promote long, accurate running of the flowmeters. Radial faces of counterbores and end faces and lands of the rotor are provided with radial extensions of the axially extending grooves to provide flow of the material through the grooves.

Abstract: A device for measuring the volumetric flow rate of a fluid, particularly a lubricant fluid in a hydraulic circuit, comprising a distributor block provided with an entry bore and an exit bore, and a feed duct and return duct respectively to and from a measurement block removably supported by the distributor block, the distributor block having elements therein for adjusting the fluid feed to the measurement block, the measurement block comprising interface elements between the two blocks, a member eccentrically orbiting within a chamber defined by the casing containing the measurement block and interface elements, and guide elements for the movement of the member. A sensor is connected to the measurement block to ascertain the movement of this member, this sensor being connected to an electronic microprocessor circuit arranged to determine the fluid volumetric flow rate through the distributor block.

Abstract: A fluid volumetric flowmeter has a wall plate forming a chamber and a fluid inlet, and a fluid outlet. Two rotors positioned within the chamber have intermeshing lobes and valleys for turning in the chamber as fluid flows from the inlet through the chamber to the outlet. At least one of the rotors has a radial recess for receiving a magnet. A shaft mount is connected to the wall plate. A response shaft is rotationally mounted in the shaft mount, and an indicator rotates with the shaft. A first magnetic coupling is mounted in the rotor recess. A second magnetic coupling is mounted on the shaft within the rotor hub and within the first magnetic coupling for rotating the second magnetic coupling, the shaft, and the indicator in response to rotation of the rotors. First paired coin-shaped magnets are aligned on magnetic axes extending diametrically through the rotor axis. Second grouped coin-shaped magnets are aligned on the single magnetic axis within the rotor hub.

Abstract: A positive displacement flushable flow meter has sensing elements that are rotated by and at a rate in accordance with a flow of fluid through the flow meter. The flow meter is particularly adapted for measuring the volume flow rate of coating material supplied to spray coating apparatus, and to permit the flow meter to be quickly flushed by means of alternate bursts of relatively high velocity air and solvent, without overdriving the sensing elements and damaging the flow meter, a bypass valve is provided. During a spray coating operation, the bypass valve is closed and all of the coating material flows past and rotates the sensing elements. During a flushing operation, the bypass valve is opened to divert some of the relatively high velocity flow of air and solvent around the sensing elements, while allowing a controlled and limited amount of air and solvent to move past and rotate the elements to clean them without causing them to be overdriven.

Abstract: A liquid flow meter of the type having a positive displacement rotatable member responsive to liquid flow, with a permanent magnet affixed to the rotatable member. A magnetically-operable reed switch is located proximate the reed switch, but outside the liquid flow housing, and battery-operated circuits accumulate counts of reed switch closures, and display the counts in units representative of liquid flow volumes.

Abstract: A flow meter has a rotor with vanes. The rotor is mounted with sealing clearances in a casing and defines therewith a working space. The casing has fluid admission and discharge ports and recesses for accommodation of rollers. Peripheries of the rollers define with the recess surfaces and with the rotor surface other sealing clearances dividing the working space into fluid admission and discharge chambers. The rollers are made with grooves for the rotor vanes to pass therethrough. Each recess has pockets, and a sealing land is defined between the pockets. The valve of any sealing clearance ranges from 0.0005 to 0.0002 times the roller diameter.

Abstract: The device measures the flow of a fluid and comprises a rotor 16 having vanes which is driven in rotation by a stream of fluid in a sealed housing 11 having a circular cross-section and provided with a supply nozzle and a discharge nozzle for the fluid which are in alignment and disposed tangentially to the rotor so that the fluid stream issuing from the supply nozzle encounters the vanes 1 in a direction perpendicular to the axis of rotation 17 of the rotor. The rotor 16 has two lateral flanges 16a, the vanes, the flanges and the housing defining, apart from a clearance for permitting the rotation of the rotor, a series of compartments which communicate by way of that clearance with two lateral chambers 12a of the housing. The invention is in particular applicable to the measurement of small flows of gas under high pressure.

Abstract: A modular oscillating piston-type fluid meter including a plurality of three or more oscillating piston measuring modules in stacked relationship to each other, each of the measuring modules having a piston operatively connected for synchronous, conjoint rotation with the pistons of adjacent measuring modules. The measuring modules are substantially identical to each other and include a body portion which defines a cylindrical chamber. Outlet and inlet ports communicate with the cylindrical chamber. Fluid is supplied to the ports by internal or external manifolding conduits.

Abstract: An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the fluid meter has a gate with at least two pockets which rotates at the same velocity as a rotor having the same number of vanes and the inner diameter of the rotor vanes is controlled to provide a properly sized orifice between the vane inner diameter surface and the gate hub so as to provide a driving torque to the gate due to the passage of the vanes through the gate pocket, the gate driving torque being balanced to match gate retarding torques due to fluid dynamic losses, friction of the gate drive train and friction of the gate bearings.

Abstract: An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the vanes are dimensioned to each have a length no greater than 1.5 times their width.

Abstract: An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the outer diameter of the gate is the maximum possible which still allows the crescent to have an arc about the rotor axis which is sufficient to enclose the radial center lines of any adjacent pair of rotor vanes.

Abstract: An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the outer diameter of the gate is maximized and the inlet and outlet passages of the meter are shaped to perpendicularly intersect the rotor vanes when the vanes are sealing against the respective ends of the meter crescent. Furthermore, the inlet and outlet passages each have a total cross-sectional area substantially equal to a vane area to provide substantially constant fluid velocity.

Abstract: An internal gate rotary vane fluid meter is provided with a direct gearless drive between the rotor and the gate mounted on parallel displaced shafts inside a housing. A plurality of timing discs mounted on the rotor are utilized for drivingly coupling and synchronizing the gate to the rotor.