Abstract: The present invention relates to an exhaust system for a combustion engine of a marine vessel. The exhaust system includes an exhaust system inlet configured to be coupled to an exhaust gas outlet of the marine engine, one or more exhaust system outlets, and an exhaust gas flow path extending from the inlet to the one or more exhaust system outlets and having a forward flow direction from the exhaust system inlet and a reverse flow direction extending from at least one of the one or more exhaust system outlets. The exhaust system further includes a flow redirection arrangement in the exhaust gas flow path for restricting a flow of liquid flowing in the reverse flow direction, the flow redirection arrangement comprising at least one flow redirection feature configured to redirect a first stream of the liquid toward the forward flow direction to collide with a second stream of the flow of liquid. The invention also relates to motor assemblies and marine vessels having such exhaust systems.

Abstract: A rotating detonation engine (RDE) is disclosed which includes a housing, an injector assembly disposed within the housing, the injector assembly includes a fuel manifold, an oxidizer manifold, and a combustion chamber, fuel from the fuel manifold and an oxidizer from the oxidizer manifold are combined and combusted in the combustion chamber, each of the fuel and oxidizer manifolds communicates with the combustion chamber via a plurality of Tesla valves each via a corresponding port, wherein the plurality of Tesla valves substantially eliminate reverse flow of exhaust gases from the combustion chamber back to the fuel manifold or the oxidizer manifold.

Abstract: An orbicular valvular conduit which has no moving parts and is configured to facilitate unidirectional flow of a primary fluid stream by utilizing a counterflowing diverted fluid stream to counteract any opposing fluid stream which flows in the direction opposite the primary fluid stream may include at least one conduit subunit. Each conduit subunit may include a fluid diverging section. A fluid converging section may extend from the fluid diverging section. A valve core may be disposed in the fluid diverging section and the fluid converging section. A primary flow passage may extend through the valve core to accommodate a primary fluid stream. A secondary core passage may be formed by and between the valve core and the fluid diverging section and the fluid converging section.

Abstract: Disclosed is a fluid driven pulsating, hammering tool operational when pressurized fluid is pumped into the tool's upper sub, having a poppet valve which can seal the upper end of a slidable outer valve assembly when closed; an inner valve assembly slidable within the outer valve assembly; wherein the inner and outer valve assemblies remain in selective fluid communication with the poppet valve even when the poppet valve is closed, wherein interruption of said fluid communication occurs from movement of the inner and/or outer valve assemblies to particular positions along their sliding paths; and further including a lower valve which is preferably a Tesla valve having channels which are also in fluid communication with the poppet valve.

Abstract: Provided is a compact sized low flow rate fluidic nozzle insert. The fluidic nozzle insert may include a fluidic oscillator chip on a front face having a flat-top interaction region, and a manifold on a back face, located opposite the front face, to house fluid. The fluidic nozzle insert may further include at least one feed having a u-shape connecting the front face and back face for the transport of fluid from the manifold, at least one power nozzle oriented toward the front face for directing fluid from the at least one feed to the interaction region of the fluidic oscillator chip, and a v-shaped outlet at the bottom of the interaction region defined by two flat walls for the passage of fluid from the interaction region to the outside of the fluidic nozzle insert in a fan pattern. The produced spray fan pattern may be uniform and fluid nozzle may work well with high viscosity fluids.

Abstract: The present invention is directed to an improved fluid diode using topology optimization with Finite Element Method (FEM). Topology optimization as a flexible optimization method has been extended to the fluid field. For given boundary conditions and constraints, it distributes a specific amount of pores (or remove materials to get channel) in the design domain to minimize/maximize an objective function. In this design, inlet and outlet ports are aligned and inflow and outflow are in the same direction. The present invention features an intricate network of fluid channels having optimized fluid connectivity and shapes, which significantly improves the diodicity of fluidic passive valves.

Abstract: A compressor includes a compression chamber forming member, an injection passage, an injection pipe, and a pulsation attenuation space. The compression chamber forming member forms a compression chamber. The injection passage is formed in at least one of the compression chamber forming member and a separate member disposed in a surrounding area and connecting to the compression chamber. The injection pipe supplies refrigerant to the injection passage. The pulsation attenuation space is formed in one of the compression chamber forming member and the separate member disposed in the surrounding area so as to communicate with the injection passage. The pulsation attenuation space attenuates pulsation of refrigerant gas flowing from the injection pipe into the compression chamber.

Abstract: Technology presented herein improves the comfort of over ear headphones by reducing over ear heat and therefore sweat via an active ventilation mechanism. Headphones include two or more one-way valves: one valve at the bottom of the cup allowing air to flow in, and another valve at the top of the earcup allowing air to flow out of the earcup. In the audible frequency range the valves have high acoustic impedance in both directions to prevent the sound from escaping from the earcup into the environment. In the inaudible frequency range the valves operate as an upward pump because the upward direction has low impedance and the downward direction has high impedance. The pumping action is further aided by the natural tendency of warm air to rise, and by the speaker creating positive and negative pressure within the earcup and therefore expelling or sucking in air, respectively.

Abstract: A sealing element for a turbomachine, in particular an aircraft engine, with a housing for the at least one rotating structural component is provided. The sealing element comprises a honeycomb structure for arrangement inside the housing, wherein the honeycomb structure extends in a first direction, wherein support structures are connected to the honeycomb structure in one piece and/or in a pattern-like manner and extend at least partially into the honeycomb structure, and the support structures extend at least partially or completely in a second direction that is different from the first direction. The support structures have planar portions, which are formed by at least one partially or completely closed cell together with the honeycomb structure.

Abstract: A product for applying tension is disclosed. A block may have a first passage opening into the block. A body may have a first manifold and may be positioned against the block so that the first passage is open to the first manifold. The body may have a flow path for providing fluid from the first manifold to a second manifold and there through to a pressure chamber. The flow path may include a series of channels and may be configured to allow substantially unimpeded flow from the first manifold to the second manifold, and to impede flow from the second manifold to the first manifold. The flow path may be free of movable components.

Abstract: A monolithic three-dimensional fluidic check device is presented. The monolithic three-dimensional fluidic check device comprises a housing surrounding a fluidic flow path and having a first opening at a first end of the housing and a second opening at a second end of the housing, and an elongated center body positioned within and extending along the fluidic flow path. The elongated center body is stationary relative to a flow of fluid.

Abstract: A fluidic oscillator having independent frequency and amplitude control includes a fluidic-oscillator main flow channel having a main flow inlet, a main flow outlet, and first and second control ports disposed at opposing sides thereof. A fluidic-oscillator controller has an inlet and outlet. A volume defined by the main flow channel is greater than the volume defined by the controller. A flow diverter coupled to the outlet of the controller defines a first fluid flow path from the controller's outlet to the first control port and defines a second fluid flow path from the controller's outlet to the second control port.

Abstract: Particular embodiments of the inventive technology disclosed herein relate to the use of a dynamic valve to reduce motion caused by impulse force applied to a positioned component. Typically, the inventive technology finds application in an internally pressurized positioning system. At times, use of the inventive technology may lead to cost savings by, e.g., allowing for the use of smaller diameter positioner actuators and/or a reduced internal pressure.

Abstract: A wellbore servicing system disposed at a wellbore, the wellbore servicing system comprising at least one wellbore servicing equipment component, wherein a flow path extends from the wellbore servicing system component into the wellbore, and a flow-back control system, wherein the flow-back control system is disposed along the flow path, and wherein the flow-back control system is configured to allow fluid communication via the flow path in a first direction at not less than a first rate and to allow fluid communication via the flow path in a second direction at not more than a second rate, wherein the first rate is greater than the second rate.

Abstract: Fuel systems for supplying fuel to an engine are described. In one example, fuel is evacuated from a fuel rail upon vehicle shut-off by directing fuel from a fuel pump to provide a motive flow for an ejector to pump fuel from the fuel rail to a fuel tank.

Abstract: A fluidic oscillator having independent frequency and amplitude control includes a fluidic-oscillator main flow channel having a main flow inlet, a main flow outlet, and first and second control ports disposed at opposing sides thereof. A fluidic-oscillator controller has an inlet and outlet. A volume defined by the main flow channel is greater than the volume defined by the controller. A flow diverter coupled to the outlet of the controller defines a first fluid flow path from the controller's outlet to the first control port and defines a second fluid flow path from the controller's outlet to the second control port.

Abstract: An inflatable device is provided, comprising a carcass and an internal air intake mechanism assembly. The carcass defines a surface of the device and surrounds an inner volume of the device, and has an opening. The internal air intake mechanism assembly comprises a primary one way valve mechanism joined to the carcass to cover the opening. The primary one way valve mechanism extends into the inner volume and is configured for enabling air to be directed into inner volume from an environment external to the carcass, while preventing or limiting air flow from the inner to the external environment.

Abstract: Disclosed herein is a micro fluid transferring system that comprises a micropump having a chamber, a first fluid transferring portion connected to the chamber, and a second fluid transferring portion connected to the chamber. This system is characterized in that at least one of the first and second fluid transferring portions comprises a pressure absorbing section for absorbing or alleviating a liquid vibrational pressure therein.

Abstract: An arrangement for separating a fluid from admixtures has at least a first and a second separation unit. The separation units are of the type using an increased pressure or pressure difference for their function and have improved performance with increased pressure. The second separation unit is supplied with the fluid by a pressurising pump device. The first separation unit furnishes fluid of reduced concentration of admixtures to the pressurising pump device. It is supplied with supply fluid having reduced, the same, or elevated concentration of admixtures, preferably either taken directly from an outlet of the pump device or from an outlet of the second separation unit for fluid of increased concentration of admixtures. Overall, the concentration of admixtures in the fluid supplied to the second separation unit is decreased, leading to an increase in overall performance.

Abstract: The performance of a double-cone device (1) is increased, not only by moving the gap or inlet openings (22) a short distance into the exit cone (47), but also by making the conicity ?3 (55) of the so-formed small diffuser less than the conicity ?2 (109) of the remaining part (53) of the exit cone. Double cone units (7, 60), particularly the ones with this improved diffuser, may be used in pump installations (1, 60), like well-pumps (1), where liquids must be pumped from great depths.

Abstract: An air-driven microfluid control device and its method are disclosed. The control device contains an air source, a first inlet, a second inlet, a narrow sector, and an outlet. The air source is connected two the two inlets to produce an airflow. The first inlet connects to the narrow sector, which then connects to the outlet. The air flows through the first inlet and the narrow sector and exits via the outlet. A fluid tunnel connects to the narrows sideways. The second inlet connects to the fluid tunnel so that the air entering the second inlet flows into the fluid tunnel. Through the interaction between the two inlets, pushing and pulling forces can be produced to control the fluid inside the fluid tunnel.

Abstract: These and other objects of the present invention are achieved by provision of a flow through ultrasonic system for facilitating the flow of flow-resistant materials. The system includes a supply of material and an ultrasonic horn having at least one passage extending therethrough. An isolating tube which is compatible with the material is provided passing through the at least one passage in the ultrasonic horn, the isolating tube in communication the supply of material and completely isolating the ultrasonic horn from the material. A converter imparts ultrasonic energy to the ultrasonic horn, and in turn to the isolating tube so as to inhibit the material from attaching to and clogging the isolating tube.

Abstract: A refueling system for vehicles including a dual valve receiver connected in fluid communication with the fuel tank, and a jet sensor inside of the fuel tank and in fluid communication with the receiver. The refueling system further includes a relief valve vent in fluid communication with the fuel tank to vent the fuel tank and to relieve pressure that may otherwise build up inside the fuel tank during refueling. When refueling with an automatic shutoff nozzle, the sensor detects when a desired fuel level has been reached, and then informs the receiver to prevent fuel flow into the tank. When this occurs, the pressure inside the receiver and automatic shutoff nozzle increases, causing the nozzle to shut off automatically.

Abstract: An arrangement for separating a fluid from admixtures comprises at least a first (36) and a second separation unit (45). The separation units are of the type needing an increased pressure or pressure difference for their function of showing improved performance with increased pressure.

Abstract: The lifetime of a double-cone device (21) for creating a pressure difference in a streaming fluid can be greatly increased by moving the inlet gap (5) into the exit cone (4). This results in a short so-called diffuser (22) being obtained between the gap (5) and the orifice (19), where entry cone (3) and exit cone (4) are connected. The increased lifetime permits the double-cone device to cope with much higher flow rates. Thus higher system pressures are created which enhance the use of the double-cone for such applications as the desalination of sea water by reverse osmosis. The important application of the seperation of oil from water using a separating device such as a cyclone (57) working under elevated pressure is now feasible. The increased power of the double-cone permits one to profit more fully from the new concept of reduction of the concentration of the feed supplied to the double-cone device (21).

Abstract: A diffuser comprises a conduit having a cross-sectional area that increases in a direction fluid flow. In one embodiment, the diffuser is used to reduce the incidence and severity of flow fluctuations that occur in an electrostatic deposition apparatus. In some embodiments, the diffuser includes one or more flow control features. A first flow-control feature comprises one or more appropriately-shaped annular slits through which fluid having a greater momentum than a primary fluid moving through the diffuser is injected into the “boundary layer” near the wall of the diffuser. A second flow control feature comprises one or more annular slits or, alternatively, slots or holes that are disposed at appropriate locations around the circumference of the diffuser through which a portion of fluid flowing in the boundary layer is removed. Boundary-layer flow removal is effected, in one embodiment, by creating a pressure differential across such annular slit or slots.

Abstract: A device (10) for treating a continuously moving liquid has a liquid inlet (12) and a liquid outlet (14) at opposite ends of a generally annular passage (16). The passage has a restriction (18) which is generally cylindrical and which, at its outlet (22) is formed with an annular shoulder (24) which provides an abrupt change in the diameter of the passage. An obstruction (26) in the form of a wire extends across the restriction (18) adjacent the outlet (22). The restriction (18) serves to increase the speed of liquid flowing through the passage, thus reducing the liquid pressure. The obstruction (26) also assists in reducing the liquid pressure. The device reduces the liquid pressure below a level at which cavitation occurs in order to induce cavitation.

Abstract: Methods devices and systems that employ non-mechanical valve modules for controllably directing fluid and other material movement through integrated microscale channel networks. These non-mechanical valve modules apply forces that counter the driving forces existing through a given channel segment, via fluidly connected channel segments, so as to selectively arrest flow of material within the given channel segment.

Abstract: Atomized particles within a desired size range (e.g., 1 micron to about 5 microns) are produced from two immiscible fluids, a first fluid source containing the formulation to be atomized, and a second fluid source which is contained in a pressure chamber surrounding at least the area where the first liquid is to be provided. The invention provides methods for: the production of templates for microfabrication, such as particles that serve as templates for self-assembly of monolayers; the creation of small particles to serve as building blocks for the microassembly of objects; and the use of an atomizate to etch configurations and/or patterns onto the surface of an object by removing a selected portion of the surface.

Abstract: A method of controlling flow of a driven fluid in a channel, the channel being defined by an encircling wall, the method comprising the steps of sealing the channel with a sealing fluid immiscible in the driven fluid blocking the channel at an initial position, in which the sealing fluid has a first contact angle with the encircling wall and the driven fluid has a second contact angle with the encircling wall and the first contact angle is less than the second contact angle; and moving the sealing fluid in the channel by a force generated outside of the channel.

Abstract: Microdevices based on surface tension and wettability are useful as sensors, detectors, actuators, pumps, among other applications. As sensors and detectors they can respond to numerous stimuli such as pressure, temperature, gravity, rotation, acceleration, oscillation, chemical environments, magnetic fields, electric fields, radiation, and particle beams with a great choice of output options. Because of their design, they can be used in a broad range of temperatures and environments. Additionally, unlike other microsensors and detectors, these devices can be exposed to forces and pressures orders of magnitudes greater than their design limit and still return to their original accuracy and precision. These microdevices are also useful as actuators, pumps, valves and shutters. It is possible by joining these devices together to form complex devices that are able to control macroscopic flows for example. They are also able to perform complex electrical switching operations.

Abstract: The invention relates to a fluidic oscillator which is symmetrical with respective to a longitudinal symmetry plane, comprising a fluid inlet intended to form a bidimensional fluid jet which oscillates transversally with respective to the symmetry plane, an obstacle wherein is arranged a cavity which faces said fluid inlet and which is scavenged by the oscillation jet, characterized in that the obstacle has a front wall which has two so-called front surfaces substantially planar and framing the cavity, the plane of each surface being substantially perpendicular to the symmetry plane, said cavity being defined by a surface which is substantially parallel to said plane at the points where said surface joins each of said front surfaces, the obstacle also having two side walls of which said side surfaces are substantially parallel to the symmetry plane at the points where each of them joins the corresponding front surface.

Abstract: Flow diverter methods and apparatus useful, for example, in adsorber systems capable of meeting the California ultra-low emission vehicle (ULEV) standard, are described, the adsorber systems incorporating a combination of a burn-off catalyst and a modified adsorber constructed with an open flow region of substantially unobstructed flow having a hole or a region of larger cell openings, the flow diverter acting to control exhaust flow through the adsorber to both increase adsorption and reduce the light-off time of the burn-off catalyst.

Abstract: The invention provides a fluidic oscillator which is symmetrical about a longitudinal plane of symmetry (P), the oscillator comprising means for generating an oscillating two-dimensional fluid jet, an obstacle provided in its front portion with a cavity that is swept by the oscillating jet, and a longitudinal element disposed in the empty space situated downstream from said obstacle in such a manner as to partially subdivide said space into two identical zones, and to form between them at least one communication channel for the fluid. The invention also provides a fluid flow meter including such a fluidic oscillator.

Abstract: A fluidic oscillator and a flow meter including such a fluidic oscillator comprising a fluid inlet suitable for forming a two-dimensional jet: an obstacle possessing a front portion in the form of a chamber facing the inlet on the path of the jet, said chamber including two walls that are symmetrical about a longitudinal plane of symmetry passing through said inlet, the walls meeting said plane; and means for increasing the pressure on each of the lateral flanks of the obstacle in the vicinity of the front portion in alternation and in a relationship with the oscillation of the jet between the walls of the chamber.

Abstract: A jet level sensor used for controlling the liquid level in a tank such as a fuel tank. The sensor includes a nozzle and receiver supported within a bracket so that the nozzle and receiver and the associated conduits are freely rotatable with respect to the bracket. A manifold is coupled to the receiver for providing a plurality of output pressure signals indicative of the liquid level within the tank. The sensor is connected to a system which includes a main inlet valve and redundant relay valves which are fluid pressure responsive and which shut off responsive to the absence of a pressure signal from the sensor when the liquid within the tank reaches a predetermined desired level. Also provided are shut-off valves connected to be responsive to a tank and nozzle failure over-pressure condition at the inlet or within the tank.

Abstract: A spray-forming output device for fluidic oscillators to provide relatively wide-angle three-dimensional output spray patterns is connected to the output of a fluidic oscillator. The device comprises mutually counter-directed conduits whose entry regions are fed from the oscillator output and whose exit regions are connected to an interaction outlet region that includes a common outlet, the common outlet being directed substantially orthogonally with respect to the plane in which the counter-directed conduits are disposed. In one embodiment, the interaction outlet region includes an impact wall disposed at the exit regions of the counter-directed conduits proximally to the common outlet.

Abstract: A pneumatic actuator comprises a cell through which a normally laminar flow of air passes between an inlet and an outlet to provide, in the outlet, an output pressure. The cell includes an electro-acoustic transducer, for example a piezo-electric element arranged, in response to an oscillating electrical signal, to produce an acoustic signal that disturbs the laminar flow whereby at least some of the air exhausts from the cell via one or more exhaust ports and the output pressure falls. The difference in the output pressures may be used to control a pneumatic device optionally via a pneumatic amplifier. The electrical signal is produced by an opto-electrical transducer to which optical control signals are transmitted, for example along a fibre optic cable.

Abstract: A full wave fluidic rectifier which produces a direct fluidic output signal having an amplitude which increases from a very low level as the amplitude of an alternating fluidic input signal increases. In includes a nozzle for directing a fluid stream along the rectifier axis into a null venting outlet, two signal outlets which are symmetrically disposed in opposite sides of the null outlet, and two control signal inlets for applying the alternating input signal to the stream, deflecting the stream alternately toward the two signal outlets in proportion to the amplitude of the alternating input signal. The two signal outlets are connected by respective channels of equal fluid resistance to a common channel which serves as the rectifier output.

Abstract: A fluidic sensor of objects comprising a body in which there are mounted an emitting nozzle connected to a feeding chamber connected to a feeding conduit, and an intake nozzle disposed in the area defined by the emitting nozzle and connected to an outlet conduit. Between the inlet conduit and the feeding chamber there is, shaped in the body, an additional chamber inside which there is a movable valve body with conical seats shaped on opposite ends, which is connected to a switching sensor movably mounted in the body. The switching sensor disconnects the flow of feeding energy when the object is outside a zone of detection and causes an acoustic signal if the object moves too close to the fluidic sensor. The acoustic signal can be used to cause a breakdown step.

Abstract: A small, but nevertheless high-flow fluidic oscillator has a dual level body portion including an interaction chamber in a first level. An inlet plenum supplies fluid to a supply nozzle which enters directly into the inlet end of the interaction chamber to direct a jet flow from the supply nozzle, through the interaction chamber and out of an outlet opening. A fluid passage is located at least partly in the second level of the body portion, and connecting passages on either side of the supply nozzle connect the fluid passage to the inlet end of the interaction chamber. The walls of the interaction chamber converge from the inlet end toward a neck portion and thereafter diverge and then converge again at the outlet so that a fluid column extends between the jet flow and the sidewalls of the interaction chamber, and moves cyclically back and forth through the fluid passage and the connecting passages to obtain interaction between the fluid column and the jet flow without the need for control nozzles.

Abstract: An apparatus is disclosed for dispensing a precise volume of liquid. An emitter dispenses a stream of liquid to an appropriate collector and includes an outlet restriction for generating a positive pressure in the emitter behind the outlet restriction. Liquid is fed to the emitter under pressure. A time delay loop is provided in communication with the emitter behind the outlet restriction for receiving liquid therefrom under the influence of the positive pressure. The exit end of the time delay loop directs liquid received thereby against the stream of liquid dispensed by the emitter and diverts the stream of liquid away from the collector when the time delay loop becomes filled with liquid under pressure from the emitter. A fluid amplifier is provided for generating a laminar liquid power stream to the emitter and for controlling the on-off cycle of the apparatus.

Abstract: A liquid level control system for controlling the flow of liquid into a reservoir, storage tank or other container. A nozzle develops a liquid flow stream therethrough, and a valve effectively opens and closes the nozzle. A fluid amplifier is associated with the nozzle and includes a fluid power stream, a signal developing port for receiving a fluid pressure signal from the power stream, and a sensor for diverting the fluid power stream from the signal developing port in response to the static presence of the interface at a predetermined sensing level of liquid in the reservoir. A pressure responsive switch is coupled to the valve and is located below the signal developing port of the fluid amplifier.

Abstract: A fluid amplifier for sensing the level of a liquid in a reservoir, storage tank or other container and for generating a differential in pressure signal in response to the static presence of the liquid level at a predetermined level. An inlet develops a liquid flow stream. A first passage of major cross-sectional dimensions is provided for delivering a major portion of the flow stream to the reservoir or storage tank. A second passage of minor cross-sectional dimensions is spaced laterally of the first passage for developing a small signal fluid power stream substantially parallel to the major supply stream. A sensor is responsive to the static presence of the liquid level at the predetermined level for altering the smaller fluid power stream from its substantially parallel flow condition to a condition in which it diverts and attaches to the major supply stream.

Abstract: A fluidic flow control device includes at least three terminals with two of the terminals being connected to input nozzles opposing each other in axial alignment. An interspace is provided adjacent the point of intersection of the two streams from the nozzles and a radial diffuser is provided encircling the interspace. The third terminal communicates with the radial diffuser. The variable relationship between the flows produced at the nozzles is effective to control the flow at the third terminal. The diffuser is formed by planar faces separated by a constant width gap. The gap opens into an annular plenum to which the third terminal is connected. The entry area to the radial diffuser is sized to be substantially equal to the sum of the areas of the nozzle throats. In one embodiment, a mixer region may be provided between the diffuser and at least one of the nozzles. A fourth terminal acting as a vent may communicate with the mixer region.

Abstract: A main valve and separate sensing means are mounted in a housing spaced-apart relation. The main valve is formed with a valve chamber having an inlet port and an outlet port, and the valve comprises a valve seat and a valve member cooperating therewith. The valve member is movable between a closed position in which it engages the seat and blocks flow of fluid from the inlet to the outlet and an open position in which it is spaced apart from the seat and enables such flow. The sensing means includes an exhaust to the atmosphere and exhaust shutoff means actuable for closing the exhaust. The housing and main valve are formed with a passage enabling restricted leakage of fluid from the main chamber to the sensing means for exhaust to the atmosphere when the valve member is in the closed position. The leakage fluid is in communication with the valve member and when pressurized applies a force urging the valve member to the open position.

Abstract: Arrangement for the regulation of the height of a liquid level, such arrangement being particularly suitable for the removal of condensate from the regeneration heaters of steam turbines. The arrangement includes a transmitter nozzle for forming a gas-liquid mixture in a first, influx chamber communicating with a tank containing the liquid, a second chamber connected with the influx chamber and containing a two-phase outlet sensor which separates the gas in the gas-liquid mixture, and a system for discharging liquid from the tank including a discharge valve controlled by the pressure of the liquid in the second chamber.

Abstract: An internal valve for the bottom loading of fuel tanks consists of a differential area piston acting within a chamber which is vented by a pair of pilot valves responsive to fluid level, to provide full open, throttled and closed positions of the valve automatically in response to inlet fluid pressure. Soft closure of the inlet valve which is formed of the piston head and a seat in the valve housing, is provided by metered fluid flow through an orifice between a sized aperture in the piston head and a restrictor sleeve carried on a tank vent actuator bar extending through the aperture and through the valve housing. A lost motion connection between the piston head and actuator bar allows limited relative movement for controlling the metering orifice and combined movement for coincident opening of the tank vent in response either to inlet fluid pressure or manual actuation.

Abstract: Apparatus for containing a pressurized fluid jet, for example a "blow-out" of oil, comprises a receptacle of preferably frusto-conical form for holding a body of liquid such as water, and means whereby the jet can enter the receptacle, the arrangement being such that, with the body of liquid in the receptacle, sufficient energy is absorbed by movement of liquid to contain the jet. The energy may be absorbed by creation of vortices, and wall parts of the receptacle, when viewed in side elevation, preferably define an included angle of less than 25.degree.. The apparatus may be used as part of an oil-production installation on an oil-rig.

Abstract: In a system to control a condition of air in a duct, there is disclosed a first nozzle for issuing a jet fluid, a second nozzle for receiving a portion of said fluid depending upon the condition of the air in the duct, and a circuit arrangement for controlling a damper in the duct dependent upon the amount of fluid received by the second nozzle.