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| Number | Title | Issue Date |
| 7422028 | Apparatus for controlling and metering fluid flow A device for metering and controlling fluid flow includes a variable orifice and is configured to use a pressure sensor. The device includes a fluid flow conduit having at least one planar inner wall that extends along a portion of the fluid flow conduit length, and... | 09/09/2008 |
| 7131451 | Apparatus for controlling and metering fluid flow A device for metering and controlling fluid flow includes a variable orifice and is configured to use a pressure sensor. The device includes a fluid flow conduit having at least one planar inner wall that extends along a portion of the fluid flow conduit length, and... | 11/07/2006 |
| 6871666 | Bi-directional dual chamber orifice fitting Methods and apparatus for a bi-directional dual chamber orifice fitting comprising a body with a chamber in fluid communication with a flow bore. The fitting also comprises an orifice supported by an orifice plate carrier that is selectably disposable in the bore. I... | 03/29/2005 |
| 6796328 | Damper system with sealing plug A damper system with a sealing plug, which incorporates an air flow monitoring system. The damper system utilizes current designs of the iris damper and incorporates a sealing plug positioned in the open circular cross-section of the iris damper. One version of the ... | 09/28/2004 |
| 6647737 | Air conditioner A compressor includes a discharge chamber and a retaining passage, which is located downstream of the discharge chamber. A control valve controls the displacement of the compressor in relation to the pressure difference between a first pressure monitoring... | 11/18/2003 |
| 6564824 | Mass flow meter systems and methods A flow meter system that calculates mass flow rate based only on a single pressure signal. A flow controller is arranged in parallel with a restriction such that a constant pressure differential is maintained across the restriction. The pressure, and temp... | 05/20/2003 |
| 6564825 | Mass flow meter systems and methods A flow meter system that calculates mass flow rate based only on a single pressure signal. A flow controller is arranged in parallel with a restriction such that it constant pressure differential is maintained across the restriction. The pressure, and tem... | 05/20/2003 |
| 6557574 | Pressure based flow rate measurement device integrated with blades of a damper A differential pressure based flow rate measurement device is provided which is coupled to surfaces of a blade 30 within a damper assembly 10, such as that provided within a variable air volume (VAV) box or within a liquid valve assembly. A blade 30 which... | 05/06/2003 |
| 6286367 | Method of evaluating the effluent of a hydrocarbon well by means of a multiphase flowmeter, and installation implementing the same A multiphase flowmeter (30) is mounted on the piping via which a multiphase fluid flows out from a hydrocarbon well, so as to measure the flow rates of the various phases of the fluid. A back-pressure valve (34) is placed in the piping downstream from the... | 09/11/2001 |
| 5665923 | Full range-high accuracy air flow sensing device An air flow sensing device comprised of rotatable spaced dampers, shafts to rotate the dampers, a counter-weight attached to a shaft biasing the dampers to a closed position with respect to air flow and pressure sensor means to determine the velocity of t... | 09/09/1997 |
| 5616841 | Flow metering device for landfill gas extraction well A metering pipe for a landfill well includes an upstream segment and a downstream segment. A coupling having an orifice plate positioned therein surroundingly engages both segments. Specifically, the segments are advanced into the coupling toward each oth... | 04/01/1997 |
| 5616867 | Methods and apparatus for determining a minimum acceptable volume of fluid flow through a conduit A method and apparatus for monitoring and calibrating fluid flow through a conduit comprises sliding a control plate into the conduit and restricting the flow of fluid through the conduit so as to determine the minimum acceptable flow. The position of the... | 04/01/1997 |
| 5426985 | Multirange adjustable flow control A flush fluid flow control apparatus having an adjustable flow control valve and a flow measuring orifice combined in a block assembly. The flow control orifice is formed in a tube having a plurality of radial orifices and which can be axially turned to r... | 06/27/1995 |
| 5426975 | Method and apparatus for determining the total flow rate in a ventilation installation A method and apparatus for determining the total flow rate of air flowing through a ventilation installation with a free suction fan (15) is described. The flow rate or a corresponding pressure is determined by measurement of the partial flow rate or a co... | 06/27/1995 |
| 5379792 | Damper with blade for sensing pressure differential A fluid flow control damper having one or more blades for sensing pressures to determine velocity pressure in the flow stream. The airfoil damper blade has fluid intake openings in a portion of the blade which extends into the fluid stream upstream of the... | 01/10/1995 |
| 5125753 | Device to measure flow-through and/or quantity of heat A heat circuit comprises an initial conduit containing a flow medium and a return conduit. A choke element located in a conduit such as the initial conduit of a heat circuit serves to control the flow of the flow medium. The choke element has several acti... | 06/30/1992 |
| 4982610 | Device for measuring the flow of a gas containing particulates The flow of a gas containing entrained particulate matter may be accurately, reliably and continuously measured, utilizing an apparatus comprising a self-cleaning orifice, including counter-rotating continuously scraped cylinders, and thermophoretic press... | 01/08/1991 |
| 4957006 | Multiple orifice flow measuring device A multiple orifice flow measuring device includes a housing having a central passage and a shaft passage located above and parallel to the central passage. The central passage contains a pipe adapted to be connected to a gas flow line. Mounted in the shaf... | 09/18/1990 |
| 4938077 | Device to measure a large range of fluid flow Improvement for measuring fluid flow with an orifice meter. The device to measure flow in a conduit includes an orifice of variable section defined by two moveable plates in contact with each other, and which can be positioned with the orifice coaxial wit... | 07/03/1990 |
| 4807667 | Convertible shape hood structure for air flow measurement A hood structure for air flow measurements on ceiling registers is erected on a fixed square bottom base with an adjustable curtained aperture and mounting for an air flow meter. A hood skirt is stretched by means of four struts that fit against the upper... | 02/28/1989 |
| 4787254 | Mass flow meter A mass flow meter includes a hollow base pipe having an inlet adapted to be attached to the discharge line of an air compressor or like apparatus to be tested. The base pipe also has an outlet end which is fitted with one of a plurality of convergent nozz... | 11/29/1988 |
| 4781536 | Low-flow pump-off control A low-flow pump-off control device for deactivating a motor for a pump during conditions when a rate of supply of a source of fluid to be pumped by the pump is insufficient includes: a pipe section having an inlet and an outlet, the inlet being connectabl... | 11/01/1988 |
| 4703664 | Fluid flow measurement system sensor mounting block A system, or apparatus combination, and apparatus components, for the measurement of fluid flow. Such system, or apparatus can be used, e.g. for measuring the amount or flow of drilling fluid, or mud, introduced into a well bore, the amount or flow of mud... | 11/03/1987 |
| 4570493 | Variable orifice air flow measuring device and method A device for measuring the volume of air flowing into or out of an air conditioning duct. The device includes a hood having a top end adapted to cover the air conditioning duct to provide channeling of the air flow into an air flow measurement housing. Th... | 02/18/1986 |
| 4380936 | Tube mounting for orifice meter An orifice meter with a pair of parallel, flat steel body plates. Flow tubes of predetermined sizes are welded in mounting rings to be bolted to the opposing body plates with the inner ends of the tube extending into the body space in alignment with the o... | 04/26/1983 |
| 4324143 | Single path adjustable flowmeter A low pressure drop air flowmeter (10) for an automotive engine is disclosed. The meter includes a main air flow passage (26), a relatively small venturi tube (28) receiving a portion of the air flow, a pressure port (74) for sensing stagnation pressure i... | 04/13/1982 |
| 4231253 | Air-flow capture and control device for flow measurement Four curtains are drawn or released together to set the measuring aperture of an air-flow measuring box at the desired area and the linear velocity of flow through the aperture is measured by a single-probe velometer normally held with the probe tip essen... | 11/04/1980 |
| 4136565 | Variable geometry fluid flowmeter A low pressure drop air flowmeter for an automotive engine is disclosed. The meter includes a main air flow passage, a relatively small venturi to receive a portion of the air flow, a pressure port for sensing stagnation pressure in the main passage, a pr... | 01/30/1979 |
