Abstract: A fluid flow regulator of the present invention comprises in combination a stationary hollow duct housing having a first end and a second end through which fluid flows. The device also incorporates a movable member aligned concentric with the duct having an end essentially similarly shaped and sized to the first end of the housing. The member may be spaced apart from the duct so that fluid can enter the duct housing through an opening defined by the space between the end of the member and the first end of the duct, with the movement of the member serving to change the size of opening. The movement of the member is controlled by the movement of a float located within the duct.

Abstract: A fluid circuit breaker includes a plurality of petals and a bias system attached to the plurality of petals to maintain the plurality of petals at a closed unobstructed flow condition below a predetermined flow velocity.

Abstract: The invention relates to a flow restrictor (1) for restricting a volume flow through a liquid line, said flow restrictor comprising a support (10) having a passage and a bent flat spring (11) attached to the support (10). The flat spring (11) comprises at least one spring tab (12) and the passage at least one opening (13), the spring tab (12) and the opening (13) having a substantially identical extension along a longitudinal direction. The spring tab (12) is designed and arranged above the opening (13) in such a manner that it increasingly rests against the support (10) with increasing differential pressure, thereby gradually making the opening (13) smaller and continuously reducing the passage within a defined pressure range. The dimensions of the opening (13) are adjusted corresponding to the size of the spring tab (12), thereby allowing a compact flow restrictor (1) which is less susceptible to dirt.

Abstract: A method of forming polyurethane foam from a resin component and an isocyanate component includes the use of at least one control valve controlling a flow rate of at least one of the resin component and the isocyanate component. The method includes connecting lines having at least a 1 inch diameter to a housing of the control valve. The method also includes coupling a source of gas pressure to the line. At least one of the resin component and the isocyanate component is pressurized with the source of gas pressure to move the resin and/or isocyanate component through the line and into the flow control device at a flow rate of between 5 and 70 gallons per minute.

Abstract: An air control regulator regulates the amount of air flowing into the inlet of a combustion chamber by causing flowing air to support a disc located in the air passage against the force of gravity. Air passes around the edges of the disc and is channeled into a plurality of airflows by ovoid depressions in the inner surfaces of the regulator forming a venturi chamber. By regulating the airflow into the combustion chamber, combustion efficiency is improved.

Abstract: The present invention is for a cartridge insert valve to limit excess flow through a pipe which is part of a piping system. The cartridge insert valve includes a cylindrical housing and an inlet cap with an inlet opening defined therein. The inlet cap is positioned on a cylindrical housing first end. The cartridge insert valve also includes a seat cap with an orifice defined therein. The seat cap is positioned on a cylindrical housing second end opposite the cylindrical housing first end. The cartridge insert valve is located in the pipe such that a fluid flowing through the pipe normally enters the inlet cap, flows through the cylindrical housing and exits the seat cap. The cartridge insert valve also includes a piston assembly that shuts off flow through the valve in response to an excess flow through the valve.

Abstract: The invention relates to a microfluidic device comprising at least one micro-channel connected at one end to an enclosed area, characterized in that it also comprises an inlet circuit and an outlet circuit connected to the enclosed area and between which the fluid can be discharged without any contact with the micro-channel, wherein at least one of said inlet and outlet circuits can be controlled in such a way that the pressure at the end of the micro-channel can be modified independently from the pressure at the other end of the micro-channel.

Abstract: Controlling fluid regulation may provide increased efficiency and reliability. In one general aspect, a system and process for fluid regulation may include the ability to receive a command signal, generate a control signal based on the command signal, and move a magnetizable element relative to a wire coil in accordance with the control signal, the movement affecting a pressure in a pressure cavity. The system and process may also include the ability to sense the pressure in the pressure cavity due to the position of the magnetizable element and adjust the control signal based on the sensed pressure and the command signal. The system and process may further include the ability to sense a second parameter of the fluid regulation system and adjust the command signal based on the second parameter.

Abstract: A constant flow valve has a chamber (6) provided therein with a first diaphragm (8) having a valve member (7), a second diaphragm (9) and a third diaphragm (10). The chamber is divided into a first pressure chamber (11), a second valve chamber (12), a first valve chamber (13) and a second pressure chamber (18). The first pressure chamber has means for applying a constant inward force to the second diaphragm, and the second pressure chamber has means for applying a constant inward force to the third diaphragm. The first valve chamber is communicated with an inlet channel, the second valve chamber has a valve seat (27) corresponding to the valve member, and the valve seat divides the chamber into a bottom valve chamber (14) communicating with the first valve chamber through a communication hole formed in the first diaphragm and a top valve chamber (15) communicating with an outlet channel.

Abstract: A constant flow valve is provided including a housing having a central flow passageway. The housing further includes an inlet portion, a cylindrical body portion, a frusto-conical valve portion, and an outlet portion. An obstruction plate is positioned within the housing so as to be longitudinally moveable upon a guide rod. The obstruction plate is biased by a spring for biasing the obstruction plate axially towards the inlet portion and away from the frusto-conical valve portion. The spring exerts a force against air flowing into the inlet and through the central flow passageway so as to maintain a constant flow rate due to increased pressure differential causing the obstruction plate to move axially into the frusto-conical valve portion. Preferably, the constant flow valve includes means for adjusting the biasing means.

Abstract: The present invention is for a cartridge insert valve to limit excess flow through a pipe which is part of a piping system. The cartridge insert valve includes a cylindrical housing and an inlet cap with an inlet opening defined therein. The inlet cap is positioned on a cylindrical housing first end. The cartridge inset valve also includes a seat cap with an orifice defined therein. The seat cap is positioned on a cylindrical housing second end opposite the cylindrical housing first end. The cartridge insert valve is located in the pipe such that a fluid flowing through the pipe normally enters the inlet cap, flows through the cylindrical housing and exits the seat cap. The cartridge insert valve also includes a piston assembly that shuts off flow through the valve in response to an excess flow through the valve.

Abstract: A pulsation attenuator for a fluidic system with a fluidic pump. The pulsation attenuator includes a fluidic channel, a first fluidic device adapted to attenuate pulsations with a shallow rolloff slope, and a second fluidic device adapted to attenuate pulsations with a shallow rolloff slope. The first fluidic device and the second fluidic device are connected to the fluidic channel such that they cooperatively attenuate pulsations with a steep rolloff slope. Preferably, the first fluidic device includes a first fluidic resistor and a first fluidic capacitor, and the second fluidic device includes a second fluidic resistor and a second fluidic capacitor. Preferably, the pulsation attenuator is arranged, similar a second-order low-pass filter, in the following order: (1) first fluidic resistor, (2) first fluidic capacitor, (3) second fluidic resistor, and (4) second fluidic capacitor.

Abstract: A backpressure-protected valve suitable for subsea well treatment chemical injection applications includes an improved gate valve, a check valve and a pressure compensator responsive to ambient hydrostatic pressure. The check valve may comprise a poppet valve in a detachable outlet body. The pressure compensator comprises a free piston in a cylinder. The portion of the cylinder on one side of the piston is exposed to seawater whereas the portion of the cylinder on the opposing side of the piston is filled with a selected hydraulic fluid. In this way the valve actuator is not exposed to the corrosive and/or contaminating effects of seawater.

Abstract: A generally cylindrical restrictor insert for containing an axially movable, apertured restrictive member, housed in a flow control distributor housing of an orifice expansion device used for bi-directionally-flowing pressurized fluid, with a housing passageway being closed off via an annular adaptor flange also having an internal filter, the restrictor insert having a central axial through bore with a plurality of adjoining bore portions defining a central bore cavity, the restrictor insert also having a leading portion, with a frusto-conical front end surface, and intermediate and trailing portions, the latter having a shoulder portion and an annular end face, the restrictive member being located and axially freely movable within a distributor housing central bore cavity, with the restrictor insert, in turn being located, via slip-fit insertion, in a distributor housing central passageway.

Abstract: The present invention provides a failure protection apparatus including an air source providing air having an air pressure, a first valve in fluid communication with the air source permitting fluid communication of a control fluid between a first fluid port and a second fluid port when the air pressure is at least a minimum air pressure and preventing fluid communication of the control fluid between the first fluid port and the second fluid port when the air pressure is below the minimum air pressure, a second valve in fluid communication with the air source preventing communication of air between an air inlet and an air outlet when the air pressure is at least the minimum air pressure and permitting communication of air between the air inlet and the air outlet when the air pressure is below the minimum air pressure, a third valve in fluid communication with the air source permitting communication of air to a third valve outlet when the air pressure is at least the minimum air pressure and preventing communic

Abstract: The invention is for a safety valve for a piping system. The safety valve has a cylindrical housing, a piston assembly with two disc-shaped pistons, each piston having at least one orifice defined therein, a shaft connecting the pistons, a valve stem, and a stop attached to one end of the valve stem. The safety valve has a valve seat with an opening shaped and sized to receive the stop. The safety valve has a spring positioned in the housing against the piston assembly so that the spring exerts a spring force on the second piston in a direction opposite the direction of fluid flow. When fluid forces acting on the piston assembly exceed a spring force acting on the piston assembly, the piston assembly moves in the direction of flow until the stop engages the valve seat and shuts off flow through the safety valve.

Abstract: An automatic flow rate control valve, includes a tubular body, defining a flow path between inlet apertures having a gradually variable cross-sectional area and a fluid outlet at one end; a flow control piston is axially movable within the tubular body, under opposite actions of the fluid pressure and a biasing spring, to choke the fluid inlet apertures, while maintaining a constant flow rate. The control piston is in the form of a first cup-shaped element sliding on a second cup-shaped element to define a hydraulic damping chamber, communicating with the flow path.

Abstract: An inline liquid flow control valve includes an intake fitting member with a bottom portion having a bottom portion threaded section and a liquid flow section having apertures. The valve further includes an outlet fitting member with a top portion having a liquid outlet section with apertures. A top portion threaded section of the outlet fitting member engages a bottom portion threaded section of the intake fitting member with a compression member disposed therebetween. The compression member engaging a piston disposed internally within the intake fitting member. The apertures in the intake fitting member, apertures in the piston, an annular sleeve and the plurality of apertures in the outlet fitting member define a liquid flow chamber. A flow rate of liquid through the liquid flow chamber is inlinely adjustable and maintainable using an internally disposed compression member.

Abstract: A surge suppressor and safety shut-off valve is described which automatically shuts off fluid flow in response to a sufficient pressure differential across the valve. The shut-off valve comprises a valve body adapted for use within a fluid distribution system through which a predetermined flow of a fluid is nominally allowed to pass. A flow restricting means is disposed therein that reduces the maximum flow when triggered by a sufficient pressure differential between inlet and outlet. By way of example, the flow restricting means is preferably provided by a poppet which is slidably engaged within the valve chamber to restrict fluid flow therethrough. The poppet is preferably adapted with a very low volume bypass port through which opposing pressures at valve inlet and outlet may be equalized for automatically resetting of the valve after the surge has passed, or a rupture has been repaired.

Abstract: A regulating insert for insertion in a valve housing or the like in a flowing medium, comprising comprises a pre-setting means for regulation and/or setting of amounts of liquid in installations with flowing media for the limitation of the medium to a pre-set maximum amount, independently of a differential pressure working across the valve. The insert further comprises a tubular regulating element which is displaceable in a housing (3) in the longitudinal direction of the regulating insert, and lies up against a spring element (13) so that upon displacement the tubular regulating element (2) respectively opens or closes a number of openings (9) in the housing (3). The tubular regulating element (2) is influenced for regulation by a membrane, where the membrane (14) is a roller membrane, the roller membrane (14) being fastened along an outer diameter to the inner side of the housing (3) and along an inner diameter is fastened to the outer surface of the regulating element (2).

Abstract: A valve assembly that includes a valve body defining a fluid passage. First and second ends of the fluid passage define first and second ports for fluid flow. A spring and piston are located in the fluid passage. The piston has a travel length extending between first and second positions with a third position located therebetween. The spring biases the piston from the first toward the third position and is located outside the axial piston passage. The piston at least partially defines a first, second and at least one third opening. The first opening defines a variable constriction which increases in size as the piston moves from the first to third positions. The piston end wall defines the second opening and the piston sidewall defines the third openings. Movement of the piston from the third to second position exposes the third openings increasing the area of the second port.

Abstract: A flexible connector incorporates an excess flow shutoff at its inlet to prevent uncontrolled flow in the event of a failure such as rupture or separation of the connector. A shutoff sleeve moves in a body between an upstream, open position and a downstream, closed position. A spring biases the shutoff sleeve toward the open position. The sleeve includes a flow metering passage, and a pressure drop resulting from excess flow through the passage moves the sleeve to the closed position against a shutoff seat. A time delay is provided by a damping system including a variable volume damper chamber defined in part by a flexible bladder. Upstream pressure is communicated to the damper chamber by a restricted flow passage provided by metal to metal contact of a washer against a body surface.

Abstract: An insert for being mounted in a valve housing (80) or a tubular member for dynamic flow control of a flowing medium. The insert comprises:—a first cup-shaped part (1) provided with an outflow area;—a second cup-shaped part (10) arranged axially displaceably within the first cup-shaped part (1) and provided with an inflow area;—a pressure spring (30) arranged for exerting a force (F) that seeks to force the two cup-shaped parts (1, 10) away from each other. The second cup-shaped part (10) is configured such in relation to the first cup-shaped part (1) that the inflow area of the first cup-shaped part (1) is closed in response to a displacement of the second cup-shaped part (10) in relation to the first cup-shaped part (1).

Abstract: A hydroaccumulator, in particular a bladder accumulator, includes a pressurized container (1) and a separation element (5) located in the container to separate a gas chamber (7) lying adjacent to an inlet on the gas side from a fluid chamber (9) lying adjacent to an inlet on the fluid side inlet (3), having a fluid connecting sleeve (11) and a valve arrangement located in the connecting sleeve (11). The valve body (17) has a transversal bore (33). The valve body is pretensioned in an open position which allows the passage of fluid and can be displaced into a closed position by a displacement of the separation element (5). The interior surface (15) of the connecting sleeve (11) lies directly against the valve body (17) and guides the displacement of the body between the open and closed positions. The side of the valve body (17?) that faces the separation element (5) is configured as a planar plate extending partially into the fluid chamber (9).

Abstract: A regulation insert, for insertion in a valve housing in a liquid-carrying medium, having adjustable pre-setting for regulation and/or adjustment of liquid amounts in plants with liquid-carrying media for limiting the medium to a pre-set maximum amount, independently of a difference in pressure working across the valve, the insert having a tubular element which in a housing (3) can be displaced in the longitudinal direction of the regulation insert and lies up against a spring element (8), so that by displacement of the tubular element (2) a number of openings (9) in the housing (3) are opened or closed, and where the pre-setting for the regulation insert has several rows of openings (4, 5, 28), where at least one row of openings (4, 5) is disposed substantially along the circumference of the tubular element (2), and where the rows of openings (4, 5, 28), independently of one another, can wholly or partly block the throughflow in such a manner that a multiple of adjustment possibilities is achieved.

Abstract: A hydraulic accumulator, especially a piston accumulator, includes an accumulator housing (10) with at least one gas chamber (12) and a fluid chamber (14). These chambers are separated from each other by a separating element (16). At least one of these chambers (12, 14) can be filled with a pressure medium or at least partially emptied through at least one valve control unit (26) which has switching valves (28, 30). One switching valve (28) is accommodated in a corresponding valve location (29), and can be moved in the direction of movement of the separating element (16) from an opening position into closing position and vice-versa. Expensive line network between the hydraulic accumulator and the valve control unit is avoided. Sealing or leakage problems, such as are common in a line network, never occur. The valve control unit (26) is accommodated in a valve block (24) which is independent from the housing (10).

Abstract: A high-pressure connector for a fuel injection system including an elongated body having an inlet that is in fluid communication with a source of high-pressure fuel, an outlet in fluid communication with the inlet of a fuel injector and a fuel passage extending therebetween. A filter is supported within the fuel passage and acts to filter particulates from the high-pressure fuel. A fuel flow limiter is supported within the fuel passage and is operable to provide predetermined quantities of fuel to pass between the inlet and the outlet at each injection event during normal operation of the combustion chamber serviced by the injector and to automatically terminate fuel flow through the connector in the event of a malfunction at the combustion chamber.

Abstract: A dripper apparatus for a water spigot includes a coupler having a threaded female member for connecting to a water spigot. A generally cylindrical elongate member has a longitudinal portion in fluid communication with the female member. The longitudinal portion has an upper portion that defines a seat within the female member. A flow controller sits on the seat. A filter screen upstream the flow controller collects particles in water flowing therethrough so that the controller does not become clogged. The flow controller includes a housing that is provided with an upper inlet for receiving a first flow rate of water from a water spigot. The housing also includes a cavity therewithin and the cavity is in fluid contact with the upper inlet. A flexible membrane is housed within the cavity and floats when water enters the cavity via the upper inlet. The upper inlet is slotted at the top thereof for further filtering water flowing therethrough.

Abstract: The invention relates to a valve that comprises at least one pump connection (10), one tank connection (14) and one consumer connection (18), and a valve piston (22) that is displaced within the valve box (12). Said valve piston separates the pump connection (10) from the tank connection (14) in at least one blocked position and interacts with an energy accumulator (24). A fluid stream that flows between the consumer connection (18) and the tank connection (14) is controlled by means of a control device (26). The control device (26) is configured as a fluid stream control that is integrated in the valve piston (22) and that allows, contrary to known valves which use a diaphragm construction, reduction, by a constant value, of the volume flow to the consumer in a load-independent manner, thereby allowing for a proportional load-independent control.

Abstract: A bi-directional flow-control device includes a housing defining a flow passage and first and second orifices installed in the passage, each orifice being tubular and having a seat, each seat having a plurality of circumferentially spaced flow-control channels, the seat of the second orifice being axially spaced from and facing the seat of the first orifice. A resiliently deformable diaphragm is disposed between the seats, whereby flow through the passage in a first direction urges the diaphragm against the seat of the first orifice and flow through the passage in an opposite second direction urges the diaphragm against the seat of the second orifice. The diaphragm in each case deforms into the channels in the seat to varying degrees as a function of pressure differential such that in either flow direction the flow is regulated to a substantially constant volumetric flow rate over a range of pressure differentials.

Abstract: A refrigerant flow metering device for use in a refrigeration system which uses a movable piston with a fixed flow passage in series with a variable area flow passage. The variable flow area is defined by the position of the piston relative to the containing housing. The position of the movable piston is a function of refrigerant pressure differential across the piston and the force of a spring member acting in an opposite direction on the piston. The variable flow area is defined as the clearance between a tapered fixed housing and the tapered portion of the movable piston. The piston is sealed via an “O” ring seal causing fluid to flow first through a fixed bore and then through the variable flow area.

Abstract: A refrigerant flow metering device for use in a refrigeration system which uses a movable piston with a fixed flow passage in series with a variable area flow passage. The variable flow area is defined by the position of the piston relative to the valve body. The position of the movable piston is a function of refrigerant pressure differential across the piston and the force of a spring member acting in an opposite direction on the piston. In one embodiment, the variable flow area is defined as the clearance between a tapered fixed housing and a tapered portion of the movable piston. In an alternative embodiment, the metering device includes a two-piece piston having a re-open feature that increases the inlet orifice diameter of the piston.

Abstract: A common rail system having a regulated prefeed pump, which pumps a fuel flow from a fuel tank to a high-pressure pump. The fuel flow is split with the aid of a valve assembly into a lubricant flow and a high-pressure feed flow that is pumped into a high-pressure reservoir, and acted upon by high pressure. The prefeed pump has a substantially linear characteristic feed curve with a certain slope. To improve the regulating performance, the valve assembly for the lubricant flow includes a valve whose characteristic feed curve initially rises in a first portion (I) with the rpm of the prefeed pump with the same slope as the characteristic feed curve of the prefeed pump. Then in a second portion (II) rises substantially linearly, with a lesser slope than the characteristic feed curve of the prefeed pump, and in a third portion (III) finally drops again.

Abstract: A refrigerant flow metering device for use in a refrigeration system which uses a movable piston with a fixed flow passage in series with a variable area flow passage. The variable flow area is defined by the position of the piston relative to the containing housing. The position of the movable piston is a function of refrigerant pressure differential across the piston and the force of a spring member acting in an opposite direction on the piston. The variable flow area is defined as the clearance between a tapered fixed housing and the tapered portion of the movable piston. The piston is sealed via an “O” ring seal causing fluid to flow first through a fixed bore and then through the variable flow area.

Abstract: A valve opening and closing mechanism comprising a cylinder, a control piston, a valve guide, and a valve assembly. The cylinder includes an inlet for supplying fluid. The control piston is slidably fitted to the cylinder and includes a first fluid passageway for flowing the fluid supplied into the cylinder. The valve guide is supported in a fluid chamber defined by the cylinder and the control piston. The valve guide includes a shaft portion and a valve support portion. The shaft portion is inserted into the first fluid passageway with defining a first clearance, and the valve support portion is formed into a collar at a base end of the shaft portion and faced an end surface of the control piston. The shaft portion of the valve guide have a conical surface portion for reducing a first sectional area of flowing the fluid when the control piston is displaced toward the fluid chamber.

Abstract: A reduced length, pressure compensating liquid flow regulator includes a poppet defining a longitudinally extending hollow cylinder having a front sense orifice and a rear orifice. A retainer maintains a biasing spring disposed at least partially within the cylinder, the retainer including a front sidewall defining a central aperture and a rear sidewall surface defining rear side slots, the retainer front sidewall forming an annular space between the cylinder rear orifice and the retainer front sidewalls. A seat has a closed front face spaced from and facing the cylinder, side passages rearwardly of the seat front face, and a downstream passage. The biasing spring biases the cylinder rear orifice longitudinally away from the seat. A hollow housing slidably receives the cylinder and fixedly receives the retainer means and the seat, the housing directing liquid flow from the retainer side slots into the seat side passages.

Abstract: A fluid valve for controlling flow of a fluid from an upstream region to a downstream region includes a housing having a fluid exit, a fluid entry member having a sidewall, and a shut-off member associated with the housing. The sidewall and the fluid entry member is formed with at least one regulating aperture for receiving fluid from the upstream region and a second aperture for receiving fluid from the upstream region. The fluid entry member is movably disposed within the housing such that the at least one regulating aperture has an effective area exposed to the upstream region that decreases as a pressure differential between the upstream region and the downstream region increases. The shut-off member is associated with the housing and the fluid entry member such that fluid flow through the second aperture is prevented when the difference in fluid pressure between the upstream region and the downstream region exceeds a desired value.

Abstract: A bidirectional flow control valve for use in a hydraulic system to regulate fluid flow in either direction of flow through the valve. The valve includes a housing, a slidable sleeve, two opposite springs, and two opposite cap nuts. The housing has a bore and a sidewall with first ports located adjacent to one end and second ports located adjacent to the other end. The slidable sleeve has an interior wall disposed therein to form a first chamber and a second chamber. The interior wall has an axial port to permit flow of fluid therethrough. The first spring is disposed within the first chamber of the slidable sleeve and constrained therein by the cap nut. The second spring has the same tension as the first spring and disposed within the second chamber of the slidable sleeve and constrained therein by the cap nut. The slidable sleeve is self-adjustable to an equilibrium position within the valve housing to at least partially open the first and second ports of the valve housing.

Abstract: A premix dispensing valve assembly for a beverage dispenser includes a housing which includes an inlet to deliver premix fluid, a compensator within the housing for subjecting a controlled pressure drop on the premix fluid which includes an outlet communicating exterior to the housing, and a regulator within the housing for applying a variable dampening effect against high fluid pressures that accompany the premix fluid upon entry into the premix dispensing valve assembly. The regulator is cooperatively linked to the inlet of the housing and communicates with the compensator. As such, integrating the regulator with the compensator optimally allows for premix fluid to maintain a constant pressure and, thus, prevent complications arising from loss of carbonation. The premix dispensing valve assembly further includes a premix delivery channel within the housing for communicating premix fluid from the inlet of the housing to the regulator.

Abstract: A flow regulator is provided which comprises a housing defining a chamber therein and including inlet and outlet ports that are adaptable to allow fluid to flow into and out of the chamber. A piston assembly, including an orifice defining member in which is formed an orifice, is movably disposed in the chamber and is capable of moving in directions toward and away from the outlet port. An urging device, such as a spring, magnetic or electromagnetic device, urges the piston assembly away from the outlet port. As fluid flows into the flow regulator, the fluid flows through the orifice. The clearance between a control surface of the piston assembly and the outlet port automatically adjusts so that an equilibrium condition occurs in the flow regulator in which the difference between the pressure of the fluid upstream of the orifice and the pressure of the fluid downstream of the orifice is maintained essentially constant.

Abstract: This invention relates to a novel apparatus and method for automatically and dynamically regulating the intake of air into the combustion chamber of a heating unit such as a wood burning stove, furnace, or fireplace to ensure even and efficient burning of fuel. More particularly, this invention pertains to a method and apparatus that uses negative gas pressure in the heating unit's flue, and no additional temperature or pressure sensors, to automatically and dynamically control a damper regulating intake of air into the combustion chamber in inverse relation to changes in negative flue gas pressure. This method and apparatus are especially useful in combination with a heating unit having two combustion chambers, one chamber for combustion of solid fuel and a second chamber for further combustion of exhaust gases and other byproducts from combustion in the first chamber.

Abstract: A pressure relief adapter includes a body and a slideable sleeve positioned in a passageway thereof and cooperating therewith and with O-rings to define a sealed chamber containing ambient air or other gas. The slideable sleeve has an enlarged head at one end. A compression spring in the chamber urges the sleeve toward the end having the enlarged head. Upon introduction of hydraulic fluid under pressure into the passageway and sleeve, the hydraulic fluid acting on the enlarged head urges the sleeve in a direction compressing the spring and reducing the size of the chamber thereby relieving pressure in the fluid flow system in which the adapter is positioned.

Abstract: An I.V. Flow Controller incorporating an adjustable, differential pressure regulator that provides a constant but adjustable differential pressure across a fixed orifice. One end of the adjustment range provides shut-off and the other end full-flow. The adjustment range covers flow rates from zero to 250 ml/hr. At a given setting, the flow rate is independent of the total hydrostatic head height between the supply reservoir and a patient, provided the head height is greater than the pressure drop across the orifice at the maximum regulated flow rate, plus venous pressure, plus the pressure drop in the indwelling catheter.

Abstract: The invention is an air flow control valve which is capable of maintaining a constant flow at the outlet despite changes in the inlet or outlet pressure. The device consists of a shell assembly with an inlet chamber and outlet chamber separated by a separation plate. The chambers are connected by an orifice. Also located within the inlet chamber is a port controller assembly. The port controller assembly consists of a differential pressure plate and port cap affixed thereon. The cap is able to slide in and out of the orifice separating the inlet and outlet chambers. When the pressure differential is sufficient, the differential pressure plate rises or falls to maintain a constant air flow. Movement of the port controller assembly does not require the use of seals, diaphragms, tight tolerances, bushings, bearings, hinges, guides, or lubricants.

Abstract: A flow control valve includes a piston moveable in a cylindrical chamber between an inlet opening and an outlet opening. The piston head has a maximum diameter smaller than the wall of the chamber to define a fixed orifice. The opposite end of the piston has a sleeve which partially blocks the outlet opening depending upon the position of the piston in the chamber which in turn depends upon the pressure differential across the fixed orifice.

Abstract: A fluid flow control valve and actuator therefor for changing fluid flow rate. A fluid flow control valve comprises a housing having a bore and an inlet and an outlet which form a flow passage through the housing. The valve also comprises a piston mounted in the bore, a fluid flow orifice communicating with the inlet and the outlet, springs which bias the piston toward the inlet, and a valve seat which is matable with the piston and is slidable within the housing to vary fluid flow rate. An actuator for changing fluid flow rate of the valve is comprised of a housing having a bore, a piston dividing the bore into a first chamber and a second chamber, springs in the second chamber for biasing the piston toward the first chamber, an actuator fluid inlet communicating with the first chamber, and an actuator fluid outlet communicating with the first chamber.

Abstract: A valve assembly is shown having a valving member situated generally in the path of flow of a fluid which varies in pressure and urges the valving member in generally the same direction as the flow of the fluid; a spring is shown resiliently resisting the movement of the valving member by the flow of fluid; as the valving member is urged in the direction of the flow of the fluid the valving member reduces the effective flow area of the valve assembly through which area the fluid is to flow; the valve assembly features low hysteresis, resistance to plugging by debris in system, is flow sensitive activating at higher pressure differential as flow is increased and it may incorporate a fail safe feature reopening in case of spring failure; flow noise attenuation is also a feature.

Abstract: A valve comprises a valve body having an inlet and an outlet defining a flow passage through the valve body. A piston is mounted in a bore intersecting the flow passage and the piston divides the bore into first and second chambers. The piston remains substantially motionless during upstream pressure fluctuations after the desired fluid flow rate through the valve has been established. Springs in the second chamber bias the piston against the fluid pressure from the first chamber. A sleeve on the piston is configured to variably sheath a cover over the outlet such that reciprocation of the piston during initiation of fluid flow through the valve varies the effective area of openings in the cover to achieve the desired differential pressure across the flow control throttle, thus setting the flow rate constant unless the throttle position is changed.

Abstract: In a damper valve for use in a steering damper arrangement of a motor vehicle having a hydrostatic displacement motor for operating the vehicle steering mechanism wherein hydraulic fluid lines extending between the hydraulic motor and a servo-valve include the damper valve, the damper valve has a throttling arrangement which permits fluid flow in one direction and limits fluid flow in the opposite direction but permits essentially unlimited fluid flow in both directions as long as the pressure difference across the damper valve is below a predetermined threshold value so as to permit unrestricted normal steering movements of the vehicle steering system, but dampen shock movements thereof.

Abstract: A piston based flow control is shown for use in a high flow beverage dispensing valve. The piston thereof includes a top perimeter edge structure that allows for continuity of liquid flow during high flow applications and particularly during the initiation of a high flow dispensing so as to eliminate chattering of the piston.