Abstract: Aspiration systems and methods for controlling blood loss during thrombus removal are disclosed herein. The systems include an aspiration catheter, an aspiration tubing, a receptacle for collecting aspirated blood, a vacuum line coupled to the receptacle, and a sensor configured to measure a flow parameter associated with a liquid within an aspiration lumen. The systems further include a regulator configured to adjust a vacuum pressure within the vacuum line, and a vacuum controller operably coupled to the sensor and the regulator. The vacuum controller is configured to receive the flow parameter from the sensor, compare the flow parameter to a target range for the flow parameter, and send an automatic control signal to the regulator based on a comparison of the flow parameter to the target range. The automatic control signal causes the regulator to adjust the vacuum pressure within the vacuum line.

Abstract: Aspiration systems and methods for controlling blood loss during thrombus removal are disclosed herein. The systems include an aspiration catheter, an aspiration tubing, a receptacle for collecting aspirated blood, a vacuum line coupled to the receptacle, and a sensor configured to measure a flow parameter associated with a liquid within an aspiration lumen. The systems further include a regulator configured to adjust a vacuum pressure within the vacuum line, and a vacuum controller operably coupled to the sensor and the regulator. The vacuum controller is configured to receive the flow parameter from the sensor, compare the flow parameter to a target range for the flow parameter, and send an automatic control signal to the regulator based on a comparison of the flow parameter to the target range. The automatic control signal causes the regulator to adjust the vacuum pressure within the vacuum line.

Abstract: Aspiration systems and methods for controlling blood loss during thrombus removal are disclosed herein. The systems include an aspiration catheter, an aspiration tubing, a receptacle for collecting aspirated blood, a vacuum line coupled to the receptacle, and a sensor configured to measure a flow parameter associated with a liquid within an aspiration lumen. The systems further include a regulator configured to adjust a vacuum pressure within the vacuum line, and a vacuum controller operably coupled to the sensor and the regulator. The vacuum controller is configured to receive the flow parameter from the sensor, compare the flow parameter to a target range for the flow parameter, and send an automatic control signal to the regulator based on a comparison of the flow parameter to the target range. The automatic control signal causes the regulator to adjust the vacuum pressure within the vacuum line.

Abstract: A fuel system for a gas turbine engine includes a secondary flow lockout valve. The secondary flow lockout valve includes a valve body having a first end that defines an inlet and a second end. The valve body includes at least one primary outlet bore and at least one secondary outlet bore. The valve body defines a channel in fluid communication with the primary outlet bore. The secondary flow lockout valve includes a cover that cooperates with the second end of the valve body to define a chamber. The chamber is in fluid communication with the channel such that the valve body is movable between at least a first position in which the primary outlet bore is open and a second position in which both the primary outlet bore and the secondary outlet bore are open based on a pressure in the chamber.

Abstract: A hydraulic pump is described, comprising at least one inlet duct for a fluid, at least one outlet duct for the fluid and at least one pumping unit interposed between the inlet and outlet ducts. At least one multifunction valve is interposed between the inlet duct, upstream of the pumping unit, and the outlet duct, downstream of the pumping unit, which valve is configured to divert the flow of fluid from the inlet duct to the outlet duct without the fluid flowing into the pumping unit. The multifunction valve comprises a valve body that defines an inner bypass channel in which a shutter element is axially movable, an actuator member operatively associated with the shutter element and configured to move it from a closing position to an opening position of the bypass channel, and an elastic contrast element operatively associated with the shutter element and configured to keep it in the first closing position of the bypass channel when such shutter element is not actuated by the actuator member.

Abstract: A hydraulic control valve maintains the pressure at a control port at a desired percentage of the pressure at two other ports as the pressure at the two other ports varies. Upon the pressure at the control port reaching a predetermined pressure setting, a fourth port will open to maintain the control port at a second desired percentage of the two other ports.

Abstract: A fluid control valve having a body, a seat ring, a valve cage adjacent the seat ring, a first valve plug assembly positioned within the valve cage, and a second valve plug assembly positioned within an axial bore of the first valve plug assembly. The first valve plug assembly has radial apertures in fluid communication with the axial bore and a first valve plug including the axial bore and a throttling port in fluid communication with the axial bore. The first valve plug assembly is movable between a closed position, in engagement with the seat ring, and an open position, spaced apart from the seat ring. The second valve plug assembly has a second valve plug that is movable between a closed position, in engagement with the first valve plug, and an open position, spaced apart from the first valve plug.

Abstract: A precision volumetric liquid dispensing instrument is disclosed that includes two pressure sensors and a fluid passageway with a defined volume portion in communication with the two sensors for receiving and distributing liquid in relatively small volumes. One of the pressure sensors is positioned to measure pressure at one portion of the defined volume portion of the fluid passageway and the other of the gas pressure sensors is positioned to measure gas pressure at a different portion of the defined volume portion of the passageway. At least one valve is in communication with the passageway for moving fluids into or out of the defined volume portion of the fluid passageway, and a processor carries out a step selected from the group consisting of (i) calculating the volume of the liquid based upon the measured pressure and (ii) metering a liquid into the defined volume portion of the fluid passageway until the measured pressure indicates that a desired volume of fluid is in the fluid passageway.

Abstract: A beverage dispensing valve includes a housing defining a chamber with an inlet for receiving a fluid and an outlet for dispensing the fluid. A piston is located in the chamber and subjected to a fluid pressure exerted by the fluid received via the inlet. The piston is moved axially in the chamber by the fluid pressure such that the piston determines a flow characteristic of the fluid dispensed via the outlet. A plunger is received in the chamber, and the fluid pressure tends to move the piston towards the plunger. A spring tends to move the piston away from the plunger, against the fluid pressure. The plunger is axially registered in the chamber in discrete plunger positions, and each plunger position sets a discrete limit on axial movement of the piston thereby determining a predetermined flow characteristic of the fluid dispensed via the outlet.

Abstract: A regulating device may include a housing that defines an inlet chamber and an outlet chamber, with a flow restriction seat between the inlet chamber and the outlet chamber. A flow restriction valve is movable relative to the flow restriction seat to adjust the flow between the inlet chamber and the outlet chamber of the regulating device. A servo valve having a servo chamber may be used to adjust the position of the flow restriction valve. The servo chamber may be fluidly coupled to the inlet chamber though a fixed flow restriction and to the outlet chamber though an adjustable flow restriction. A stepper motor may be used to adjust the servo valve to adjust the adjustable flow restriction between the servo chamber and the outlet chamber. This causes a change of the servo pressure, which moves the flow restriction valve and adjusts the flow of the regulating device.

Abstract: A vane compressor includes a housing having therein a suction chamber, a discharge chamber having a cover, and a rotor chamber, a rotor having therein a plurality of vane slots, and a plurality of vanes. The housing includes a partition that has a first surface forming the other surface of the rotor chamber and a second surface and separates the rotor chamber from the discharge chamber. An intermediate pressure chamber having a pressure that is lower than the discharge chamber and higher than the suction chamber is formed between the partition and the cover. A part of the second surface and a part of a covering surface of the discharge chamber cover are spaced away from each other by the intermediate pressure chamber. The intermediate pressure chamber is disposed so as to overlap at least a part of the other surface of the rotor chamber.

Abstract: A control arrangement for supplying a plurality of hydrostatic actuators includes a pump with an output connected to a circulating line that opens into a tank. The control arrangement has a metering port and an individual pressure compensator for each actuator. The individual pressure compensators are connected in series by the circulating line. Some of the pressure medium are configured to be branched off from the circulation channel for the respective actuator by the individual pressure compensators and fed to the metering port disposed downstream of the individual pressure compensator. The pressure medium that is not required is forwarded from each individual pressure compensator into the circulating line and is fed back from the last individual pressure compensator to the tank by the circulating line. The actuators are prioritized based on the order of their individual pressure compensators and move independently of the load pressure without expensive load sensing lines.

Abstract: A valve configured for use with a fuel tank can have a floating main valve housed within a valve body. The valve body can define a first port fluidly connected to the fuel tank, a second port fluidly connected to a tank venting system of the fuel tank and a third port fluidly connected to the filler neck. The solenoid can be configured on the check valve. The solenoid can have a pin configured to extend into the valve body and engage the floating main valve in a locked position.

Abstract: A valve, in particular a pilot-operated proportional directional poppet valve, has a valve housing (7) with a fluid inlet (21) and a fluid outlet (23). The fluid stream between the fluid inlet (21) and the fluid outlet (23) is adjustable by a main piston (27). A pilot valve chamber (37) provided on a rear face (29) of the main piston (27) has a pilot valve closing member (33) movable by an actuating device (69). By closing member (33) the fluid stream between the pilot valve chamber (37) and the fluid outlet (23) can be adjusted. An inlet aperture (3) is arranged between the fluid inlet (21) and the pilot valve chamber (37). A maximum volumetric flow controller (5) is in the main piston (27) in an outflow between the pilot valve chamber (37) and the fluid outlet (23).

Abstract: A valve configured for use with a fuel tank can have a floating main valve housed within a valve body. The valve body can define a first port fluidly connected to the fuel tank, a second port fluidly connected to a tank venting system of the fuel tank and a third port fluidly connected to the filler neck. The solenoid can be configured on the check valve. The solenoid can have a pin configured to extend into the valve body and engage the floating main valve in a locked position.

Abstract: A valve includes a valve body, an inlet orifice in fluid communication with a first fluid volume, an outlet aperture in fluid communication with a second fluid volume and in selective fluid communication with the inlet orifice by a first fluid flow path, an activation member axially movable relative to the valve body, and a plunger axially movable within the valve body. The plunger includes an aperture therethrough defining a second fluid flow path between the first and second fluid volumes. The valve is operable in a first mode in which fluid flow is only permitted along the first fluid flow path in response to manual actuation of the activation member. The valve is operable in a second mode in which fluid flow is only permitted along the second fluid flow path when a pressure difference between the first and second fluid volumes reaches a predetermined value.

Abstract: A valve, in particular a pilot-operated proportional directional poppet valve, has a valve housing (7) with a fluid inlet (21) and a fluid outlet (23). The fluid stream between the fluid inlet (21) and the fluid outlet (23) is adjustable by a main piston (27). A pilot valve chamber (37) on a rear face (29) of the main piston (27) has a pilot valve closing member (33) movable by an actuating device (69) to adjust the fluid stream between the pilot valve chamber (37) and the fluid outlet (23). A supply aperture (3) is between the fluid inlet (21) and the pilot valve chamber (37). The opening cross-section of the supply aperture (3) can be reduced by a control element (49).

Abstract: An ophthalmic surgical device (10) includes a housing (12) having a distal end (14) and a proximal end (16). A cannula (18) is attached to the housing distal end (14) and has a distal tip (20) with at least one port (22) in communication with a lumen (19) extending through the cannula (18) and in communication with an aspiration path (24) in the housing (12). A vibration source (26) is held within the housing (12) for vibrating the distal tip (20) for assisting in vitreous and other tissue removal. An aspiration source (152) connected to the aspiration path (24) for applying a negative pressure to the lumen (19) and the at least one port (22) for removing fluids and the vitreous and other tissue from the eye. The vibration source (26) and the aspiration source (152) together create a periodic bi-directional flow of tissue through the port (22) without creating cavitation externally of the distal tip (20).

Abstract: A system is provided to control fluid flow in a wastewater treatment system through wastewater level manipulation. The wastewater treatment system may include a wastewater treatment plant connected to a plurality of pump stations by a main. Each of the plurality of pump stations may include a wet well with a pump therein. The system may include a central server in communication with a sensor to sense a level of wastewater within the wet well. The pump may be automatically moved to an on position when the level of the wastewater in the wet well is at or above a first level and may be automatically moved to an off position when the level of the wastewater in the respective wet well is at or below a pump cutoff level. The central server may systematically manipulate the first level to selectively set the level of wastewater within the wet well.

Abstract: A priming valve device for a beverage machine. The device includes a casing assembly including a water inlet, a water outlet, and a drain and venting portion for discharging water or air during priming and a valve assembly associated with the casing assembly. The valve assembly includes a valve member which is moveable to a closed position which closes the water outlet by elastic return when the pressure in the water inlet decreases under the elastic return pressure of the valve member.

Abstract: A fuel metering system includes a bypass valve configured to receive a fuel flow under a pressure P1, a pressure regulating valve in fluid communication with the bypass valve and configured to receive a fuel flow under a pressure PQ, a metering valve in fluid communication with the bypass valve and the pressure regulating valve, and configured to receive the fuel flow under the pressure P1 and to output a fuel flow under a pressure P2, a single stage servo valve in fluid communication with the bypass valve, the pressure regulating valve and the metering valve, and configured to receive the fuel flow under the pressure P1, and to output the fuel flow under the pressure PQ, and to output a fuel flow under a pressure PM, and a linear variable differential transformer coupled to the metering valve.

Abstract: A heating system can include certain pressure sensitive features. These features can be configured to change from a first position to a second position based on a pressure of a fuel flowing into the feature. These features can include, fuel selector valves, pressure regulators, burner nozzles, and oxygen depletion sensor nozzles, among other features.

Abstract: A hydraulic system, including fluid flow generated by a primary pump and a secondary pump, utilizes a regulator control assembly to control fluid flow from each of the primary and secondary pumps such that a desired fluid flow and pressure is maintained at the outlet for varying actuator demands. The regulator control assembly controls the transition from using only the primary pump, to using both the primary and secondary pumps to provide a desired fluid flow and pressure through the outlet to the actuator.

Abstract: A system is provided to control fluid flow in a wastewater treatment system. The wastewater treatment system may include a wastewater treatment plant and a main that connects a plurality of pump stations to the wastewater treatment plant. Each of the plurality of pump stations may include a wet well and a pump carried by the wet well to pump the wastewater. The system may include a central server and a sensor in communication with the central server to sense a level of wastewater within the wet well. The pump may be moved to an on position when the level of the wastewater in the wet well is at or above a first level. The level of wastewater within the wet well may be systematically manipulated responsive to the central server to control the fluid flow in the wastewater treatment system.

Abstract: A volume flow regulating valve for a hydraulic system for controlling a belt-driven conical-pulley transmission. The valve includes a control piston with a pressure surface and an oppositely facing pressure return surface. A supply segment is associated with the pressure surface, and a cooler return segment is connectable with the supply segment by a control edge of the control piston. A pressure return segment is associated with the pressure return surface, and a pressurizing segment is situated between the cooler return segment and the pressure return segment.

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 siphon breaker includes a housing having a gas inlet and a gas outlet. The siphon breaker includes a stop valve adapted to transition from a closed position in which gas is substantially prevented from entering the gas inlet, and an open position in which gas is introduced into the gas inlet. The siphon breaker includes a control valve having a control valve gas inlet, a control valve gas outlet, and an electrically operated actuator. The control valve is adapted to transition from a closed position in which gas is substantially prevented from entering the control valve gas inlet, to an open position in which gas is through the control valve gas inlet.

Abstract: A valve system for monitoring and controlling a flow of a fluid additive into a main fluid line is disclosed. The system includes a pump that provides a constant flow of the additive from a fluid reservoir through a supply conduit into the main fluid line. A portion of the fluid additive may be diverted into one or more return conduits leading back to the reservoir by opening a solenoid actuated valve in the return conduit. Flow meters are employed to detect the flow rates of the fluids in the supply conduit and the main fluid line. The flow meters provide signals to a control system, which are effective to control the operation of the solenoid actuated valves to maintain a desired flow of the additive into the main fluid line.

Abstract: A downhole tool (10) comprises a body (12) defining a bore. The body includes a valve arrangement (18) including flow ports (24) in the wall of the body. The ports may be opened or closed. In addition, a variable flow restriction (30) is provided in the bore (14), the degree of restriction tending to decrease as flow across the restriction increases. The variable flow restriction may be utilized to actuate the valve arrangement.

Abstract: A membrane air dryer includes a proportioning valve for providing sweep air to the dryer. The valve may be located in an easily accessible location and may be oriented so that the movable valve element extends transverse to the length of the shell. The valve may be configured to allow air to flow back from the delivery port to the fibers during a compressor unload cycle to maintain pressure on the fibers, while blocking flow of air from the delivery port to the sweep chamber.

Abstract: A fluid diversion conduit is provided for temporarily diverting a stream during pipeline construction activities. The conduit includes an offset section that is shiftable to adjust access to the streambed, for example to allow pipeline installation across the streambed. When construction activities are obstructed by the initial position of the offset segment, the offset segment may be shifted, for example by rotation to elevate the offset segment from the streambed. Further construction activities may proceed beneath the elevated section, and pipelayers can pass under it while carrying the pipe string into position. Flow through the conduit may be maintained by siphon hydraulics or by pumps when the offset segment is elevated.

Abstract: A method for monitoring a fluid supply system includes detecting a fluid flow through the fluid supply system, and monitoring at least a length of time the fluid flow has flown without interruption, a total volume of the fluid flow that has flown, and a flow rate of the fluid flow in response to detection of the fluid flow.

Abstract: The flow control device comprises a supply passage (2) for supplying hydraulic fluid discharged by a pump (1) to a power steering output section (8); a variable throttle section (3) situated at an intermediate position of the supply passage (2); and a flow control valve (4) for returning the hydraulic fluid in the supply passage (2) to the pump inlet side, in accordance with a pressure differential between upstream and downstream of the variable throttle section (3). When the pump (1) is halted, the flow control valve (4) is impelled by a spring (13) and closes the variable throttle section (3). A throttle passage (51) is provided for connecting the upstream side and the downstream side of the variable throttle section with the supply passage (2).

Abstract: A self-contained oxygen generator containing a PSA unit and a flowmeter in the outlet line. The flowmeter provides a signal which represents the flow rate of the oxygen in the outlet line. A leakage circuit with a calibrated orifice and a solenoid valve are also located on the outlet line. In response to a signal from the flowmeter, the solenoid can be actuated so as to provide a calibrated leakage at the outlet of the PSA. This calibrated leakage is useful when overall oxygen usage is too low.

Abstract: A flow regulator with pressure relief combination valve is disclosed which can include a housing and a valve assembly. The housing can have a chamber and four ports. A cage, having a plurality of cross holes, is supported by the housing. A hollow spool is slidably disposed within the cage and is biased to engage the cage. A shoulder of the cage and a counterbore of the spool cooperate to interferingly retain an insert. A poppet is slidably disposed inside of the cage. The valve assembly includes an adaptor, a spring disposed within the adaptor, a guide disposed between the spring and the poppet, and an adjuster adjustably secured to the adaptor. The spring is arranged to bias the poppet against a seat via the guide. The adjustor is movable to adjust the position of the spring.

Abstract: An explosion protection venting system has a plurality of vessels or reactors connected by a common vent line. A flame front diverter having a pair of opposing rupturable discs is connected to each one of a plurality of vessels for directing a deflagration away from the normal flow path and through an alternate path that prevents damage to nearby structure.

Abstract: A combination fitting for flow control devices in an automotive power steering system having channels disposed in the fluid receiving end of the fitting.

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: 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: An auto-switching sub-atmospheric pressure gas delivery system, for dispensing gas to a gas-consuming process unit, e.g., a semiconductor manufacturing tool, without the occurrence of pressure spikes or flow perturbations.

Abstract: A spool 33 provided with a flange 39 is inserted in a spool bore 32, and a pressing force of a spring 52 is always applied through the flange 39 to the spool 33 at its one end in a second pressure chamber 35. A fluid groove 60 is formed in an inner peripheral surface of the spool bore 32 at a position near an abutment surface 51. A hydraulic fluid under the same pressure P2 as that in the second pressure chamber 35 is introduced to the fluid groove 60 through a fluid passage 61 formed in a valve body 31. When the flange 39 and the abutment surface 51 are in contact with each other, the hydraulic fluid is allowed to enter the interface between them through the fluid groove 60. A rise of the cracking pressure, which occurs upon the flange coming into tightly close contact with the abutment surface, can be prevented without reducing the strength of the flange 39, and stable opening/closing characteristics of the spool 33 can be achieved.

Abstract: A valve (20B) is provided is provided for regulating the pressure differential between a high pressure side (16) and a low pressure side (18) of a fluid system component (14). The valve (20B) utilizes a damping washer (60) to restrict the flow of fluid from a valve bore (32) in response to translation of a valve spool (30) in the valve bore (32). The damping washer (60) includes an aperture (78) that is piloted on a valve stem (41) extending from the valve spool (30). The damping washing (60) is biased against an open end (66) of the valve bore (32) by a spring (62) engaged between the damping washer (60) and a spring seat (48) that is engaged with the valve stem (41). A separate spring (46) is provided to bias the valve spool (30) against the high pressure fluid acting on the valve spool (30).

Abstract: On-line rheological measurements are made on a process flowing material, such as a polymer melt, utilizing a rheometer of the type in which an inlet pump delivers a relatively large volumetric flow of diverted process material from a process main stream to an inlet site located in very close proximity to the entrance of a capillary passage, and a metering pump draws a smaller portion of the volumetric flow of the diverted material from the inlet site through the capillary passage for return to the process main stream. The viscosity of the diverted material is measured as a function of the rate of flow of the material through the capillary passage and the pressure drop between spaced apart locations along the capillary passage.

Abstract: A valve for regulating the rate of flow and/or the pressure of oil flowing to a transmission or another consumer in the power train of a motor vehicle has a piston which defines with the valve housing a chamber for one or more springs and for oil being admitted through a first inlet by way of a first conduit containing a first throttle. A second inlet admits pressurized oil from a pump, and such oil can be admitted into the consumer by way of a first outlet and a second conduit containing a second throttle and supplying oil to the first conduit. A second outlet can deliver oil from the second inlet to the sump in response to shifting of the piston. A hydraulic seal is established between the piston and the housing intermediate the chamber and the second outlet to prevent leakage of oil from the chamber into the second outlet. Oil leaking from the chamber could adversely influence the characteristics of oil flowing into the consumer.