Abstract: A drilling system includes a drill string extendable into a borehole from a drilling platform and conveying a drilling fluid to a drill bit arranged at a distal end of the drill string, an annulus defined between the drill string and an inner wall of the borehole and in which spent drilling fluid ejected from the drill bit flows back to the drilling platform, and a plurality of nozzle assemblies installed on the drill string, each nozzle assembly providing a fluid flow path between an interior of the drill string and the annulus. Each nozzle assembly is transitionable between a closed state, where the drilling fluid within the interior is prevented from passing through the fluid flow path, and an open state, where the drilling fluid traverses the fluid flow path and is discharged into the annulus to combine with the spent fluid.

Abstract: A booster-ejector system captures and recycles leakage fluids from a process. When a pressure differential (head) of the process is above a threshold value, an ejector system uses motive fluid from a process high-pressure (HP) region to entrain and compress the leakage fluid, and direct it to a low pressure (LP) region. When the head is below the threshold value, a controller reconfigures a plumbing system and activates a leakage pump to pump the leakage fluid to the LP region. The system can include only one ejector, or a plurality thereof, which can be coupled such that the diffuser output of each ejector is directed to the suction input of the next ejector. At least one of the ejectors can include an exchangeable throat, which can impart a rotational component to the fluid. The HP and LP regions can be the output and input, respectively, of a compressor.

Abstract: A drive device for a motor vehicle includes an exhaust pipe and a secondary air device having a first secondary air path which feeds into the exhaust gas pipe. Disposed in the first secondary air path is a secondary air pump and a secondary air valve. To compensate, for example, fluctuations in the supply voltage of the secondary air pump, provision is made for arrangement in the secondary air path of a Laval nozzle which can be placed downstream of the secondary air valve.

Abstract: A check valve aspirator is provided including a venturi pipe having a converging section with a converging inlet and a converging outlet, and a diverging section with a diverging inlet and a diverging outlet. The converging outlet is in fluid communication with the diverging inlet. An outlet channel is in fluid communication with the venturi pipe and has an outlet port. A ratio of a diameter of the converging section outlet to a diameter of the outlet port is less than 0.4.

Abstract: A dual control shut off system, such as a dead man system for a blasting system, blasting equipment, or other equipment having both pneumatic and electric safety control circuits, may include an electric dead man's switch or a pneumatic dead man's switch. An embodiment of the dual control dead man system is for wet abrasive blasting systems used for cleaning, preparing surfaces, removing coatings, and/or other abrasive blasting operations. Embodiments of the dual control shut off system provide the ability to conveniently switch between an electric and pneumatic shut off system.

Abstract: A disclosed gas supplying apparatus includes a pressure controller that reduces a primary pressure thereby providing a secondary pressure greater than a process pressure at which a predetermined process is performed and less than the atmospheric pressure in a secondary pipe; a pressure sensor that measures a pressure in the secondary pipe; a first open/close valve provided in the secondary pipe; an open/close valve controller that opens or closes the first open/close valve; a pressure comparator that compares the pressure measured by the pressure sensor in the secondary pipe with a first set pressure that is greater than the process pressure by a predetermined pressure; and a controller that outputs a signal to the open/close valve controller thereby closing the first open/close valve, when the pressure comparator determines that the pressure in the secondary pipe is less than the first set pressure.

Abstract: A water supply system includes a first pipe, a water reservoir, and a Venturi pipe having a first Venturi nozzle terminal, a second Venturi nozzle terminal and a Venturi nozzle branch arranged between the first and second Venturi nozzle terminal. The first Venturi nozzle terminal is connected via the first pipe to the water reservoir. The first Venturi nozzle terminal is connectable to a second pipe to fill the water reservoir. The branch of the Venturi pipe is connectable to a third pipe to supply taps. Water flows through the Venturi pipe from the first Venturi nozzle terminal to the second Venturi nozzle terminal when the water reservoir is filled, and water flows through the Venturi pipe from the second Venturi nozzle terminal to the Venturi nozzle branch during the supply procedure, to provide a water supply system which requires less maintenance and is less temperamental.

Abstract: A venturi ejector for forcibly ejecting a slurry or solution generated in a fluid dispenser, wherein the venturi ejector includes a venturi, the venturi being in a first flow communication with the slurry or solution and developing a vacuum, the vacuum being in a second flow communication with atmospheric pressure, the second flow communication acting to cause the atmospheric pressure to exert a pressure on the slurry or solution, thereby forcing the slurry to the venturi where the slurry or solution is forcibly ejected from the venturi. A method for forcibly ejecting a slurry or solution generated in a fluid dispenser is further included.

Abstract: An exhaust pipe assembly includes a smaller diameter outlet pipe, a larger diameter outer pipe connected to the outlet pipe by an annular shoulder, and an inlet pipe having a downstream end received by the outlet pipe. The downstream end forms a plurality of ridges separated by grooves. Each groove has an outwardly concave surface which slopes radially inwardly from an inner end to an outer end which includes a bottom end surface. Each ridge has an outer surface which engages an inner surface of the outlet pipe. Exhaust passing from the downstream end of the inlet pipe and though the outlet pipe draws air into the outlet pipe through the grooves due to a venturi effect.

Abstract: Strategies for tool designs and their uses wherein the tools can operate in either closed or open modes of operation. The tools easily transition between open and closed modes on demand. According to one general strategy, environmentally controlled pathway(s) couple the ambient to one or more process chambers. Air amplification capabilities upstream from the process chamber(s) allow substantial flows of air to be introduced into the process chamber(s) on demand. Alternatively, the fluid pathways are easily closed, such as by simple valve actuation, to block egress to the ambient through these pathways. Alternative flows of nonambient fluids can then be introduced into the process chamber(s) via pathways that are at least partially in common with the pathways used for ambient air introduction. In other strategies, gap(s) between moveable components are sealed at least with flowing gas curtains rather than by relying only upon direct physical contact for sealing.

Abstract: The presently disclosed technology provides a venturi injector having a motive fluid inlet and a suction fluid inlet that mixes the motive fluid and the suction fluid at a desired mixing ratio over a variety of motive fluid flow rates. A pressure feedback loop fluidly links the motive fluid pressure at the motive fluid inlet of the venturi injector with the suction fluid pressure at the suction fluid inlet of the venturi injector.

Abstract: A fluid mixer in the form of a Venturi tube includes a divergent section (A2) with a steady contour curve having at least two inflection points (W1, W2) to reduce flow separations.

Abstract: A throttleable exhaust venturi is described herein that generates strong suction pressures at an exhaust outlet by accelerating an incoming ambient fluid stream with the aid of a venturi to high gas velocities and injecting a combustion exhaust stream into the ambient fluid stream at an effective venturi throat. A mixing element downstream of the venturi throat ensures that the mixed fluid stream recovers from a negative static pressure up to local atmospheric pressure. A physical and the effective throat of the venturi are designed to promote mixing and stabilize the ambient fluid flow to ensure that high velocity is achieved and the effective venturi is operable over a variety of combustion exhaust stream mass flow rates.

Abstract: A coupling and switching unit for transporting a gas-containing fluid includes at least one line having at least one coupling device. The at least one line is configured as a feed line for a gas/liquid mixture. A branched-off line is arranged at the end of the at least one line. The branched-off line is configured to direct the liquid/gas mixture towards an outflow. A throttle valve is arranged in the branched-off line. A valve is configured to control a discharge of a main flow of the gas/liquid mixture.

Abstract: A pressure washer system having a pump for pressurizing a fluid from a fluid source and selectively supplying pressurized fluid through a discharge line. The pressure washer system includes an unloader valve positioned between the pump and the discharge line. The unloader valve includes a fluid inlet, a discharge outlet, a bypass outlet, a first passageway establishing fluid communication between the fluid inlet and the discharge outlet in a first position of the unloader valve, and a second passageway establishing fluid communication between the fluid inlet and the bypass outlet in a second position of the unloader valve. The unloader valve is configured to maintain the pressurized fluid at the fluid inlet, the discharge outlet, and the bypass outlet at a substantially equal pressure when the unloader valve is in the second position.

Abstract: The invention recites an unloader valve operable to direct a flow of fluid. The valve includes a housing having a bypass opening, an inlet opening, an outlet opening and an internal chamber between the inlet opening and the outlet opening. A shuttle valve is disposed within the internal chamber and is movable between a first position wherein the flow of fluid is substantially directed to the bypass opening and a second position wherein the flow of fluid is directed to the outlet opening. The shuttle valve includes an internal flow path having a venturi therein. A biasing member biases the shuttle valve in the first position.