Abstract: Systems and methods to maintain constant pressure within a chamber within a tool via a sliding seal, wherein the seal moves to increase or decrease the size of the chamber.

Abstract: The invention relates to a test bench (10) for testing a test specimen (14), comprising a load device for generating a load for the test specimen, a test specimen holder (16) for holding the test specimen and for introducing the load onto the test specimen, and a cooling gas inflow device (32) for cooling the test specimen by means of a cooling gas stream exiting an outlet opening (48) of the cooling gas inflow device. In this case, the cooling gas inflow device is designed such that the cooling gas flow inside the cooling gas inflow device is divided into at least two part cooling gas streams in at least one section of the cooling gas inflow device.

Abstract: An improved prosthetic device with a vacuum system for maintaining a negative pressure seal between the socket and the residual limb. The vacuum system includes a vacuum surge chamber which maintains seal vacuum and increases the time between recharging a Li ion battery, allowing the battery to be recharged-up to 500 times. The system is small, lightweight, and concealable within the prosthetic device so that it neither impedes use of the device nor detracts from a cosmetically accurate limb.

Abstract: A cylindrical valve assembly, including: a housing defining a port, an interior volume, and an interior surface; a lip structure disposed about the periphery of the port, wherein the lip structure protrudes into the interior volume past the interior surface of the housing; and a valve door defining an exterior surface disposed concentrically within the housing, wherein the valve door is configured to move from an open configuration in which it does not obstruct the port to a closed configuration in which it does obstruct the port, and wherein, when the valve door is in the closed configuration, the exterior surface of the valve door is in contact with the lip structure and not the interior surface of the housing. Optionally, the lip structure is provided by an insert structure that is disposed through the port. Optionally, an end of the insert structure opposite the lip structure includes a velocity stack. Optionally, a plurality of dimples are manufactured into the exterior surface of the valve door.

Abstract: A turbocharger system is provided. The turbocharger system includes a turbine positioned downstream of a combustion chamber and a turbine bypass conduit in fluidic communication with a turbine inlet and a turbine outlet. The turbocharger system further includes a wastegate positioned in the turbine bypass conduit, a wastegate actuator coupled to the wastegate adjusting a position of the wastegate, and an air-cooled solenoid valve coupled to wastegate actuator adjusting a position of the wastegate actuator, the air-cooled solenoid valve receiving cooling airflow from an intake conduit positioned upstream of a compressor mechanically coupled to the turbine.

Abstract: An improved prosthetic device with a vacuum system for maintaining a negative pressure seal between the socket and the residual limb. The vacuum system includes a vacuum surge chamber which maintains seal vacuum and increases battery life. The system is small, lightweight, and concealable within the prosthetic device so that it neither impedes use of the device nor detracts from a cosmetically accurate limb.

Abstract: A valve assembly comprises a closure element disposed in a flow control duct, a fluid-driven actuator assembly, a shaft operable to translate linear movement of the actuator assembly into rotation of the closure element, and an integral filter and pressure regulator unit disposed in line with an actuator fluid supply passage. The actuator fluid supply passage extends between the flow control duct and the actuator assembly. The integral filter and pressure regulator unit includes a regulator housing having at least one cylindrical wall surrounding a vent cavity and a regulator cavity. Filter media is secured to the regulator housing and is disposed across a regulator orifice in communication with the regulator cavity.

Abstract: A method for opening a port through the wall of a ported sub including providing a sub with a port through its tubular side wall and providing a hydraulically actuatable valve to cover the port, the valve being actuatable to move away from a position covering the port to thereby open the port. The method further includes increasing pressure within the sub to create a pressure differential across the valve to move the valve toward the low pressure side, while the port remains closed by the valve, thereafter reducing pressure within the sub to reduce the pressure differential and driving the valve to move it away from a position covering the port.

Abstract: A fluid regulating device includes a valve body having an inlet, an outlet, a valve port, and a control element shiftable within the valve body. A control assembly includes an actuator coupled to the control element and includes a diaphragm disposed adjacent a diaphragm chamber. A sense tube has a first end, a second end, and an intermediate portion, the first end positioned to communicate with the diaphragm chamber, the second end disposed adjacent the outlet, and the intermediate portion disposed adjacent an intermediate portion of the outlet. The sense tube includes a shoulder and a flared portion, with the flared portion disposed adjacent the second end.

Abstract: An expansion valve (4) for a vapour compression system (1), and a vapour compression system comprising such an expansion valve (4) are disclosed. The expansion valve (4) comprises a first valve member (7) and a second valve member (8). The first valve member (7) and the second valve member (8) are arranged movably relative to each other, and the relative position of the first valve member (7) and the second valve member (8) determines an opening degree of the expansion valve (4). The first valve member (7) and/or the second valve member (8) is/are automatically movable in response to changes in a differential pressure across the expansion valve (4), the opening degree of the expansion valve (4) thereby being automatically altered in response to changes in the differential pressure across the expansion valve (4). It is ensured that the opening degree of the expansion valve is automatically adjusted to the actual operating conditions, thereby optimising the efficiency of the vapour compression system.

Abstract: An elbow fluid flow valve exhibiting reduced flow loss and including a body having a specified shape and size and defining a short radius associated with an elbow shaped fluid passageway characterized by a first fluid flow inlet and a second fluid flow outlet. A cover secures over the valve body, and such that a generally sleeve shaped annulus is defined therebetween. A light-weight and linearly translatable sleeve is mounted exteriorly of the valve body and within the intermediately defined annulus. The sleeve is operable to be displaced between a first location permitting fluid flow to the outlet and a second location interrupting fluid flow. A control element is operably connected to a pair of access ports, in turn communicated with one or a pair of interior regions in communication with locations of the displaceable sleeve and, upon experiencing at least one of a pressure and flow disparity between valve inlet and outlet, facilitates displacement of the sleeve to the second (flow interrupting) location.

Abstract: A valve for maintaining constant fluid flow under conditions of a specified operating inlet pressure and varying inlet pressures in excess of the specified pressure includes a tubular valve body having a fluid flow channel extending between an inlet and outlet. The fluid flow channel includes a first flow path having a first variable volume and cross-sectional area, and a second flow path having a second variable volume and cross-sectional area. The valve further includes an fluid discharge orifice whose cross-sectional area less than the minimum of the first or second variable cross-sectional areas. If the inlet pressure is above or below the specified operating pressure, the variable volumes are caused to change to maintain a substantially constant fluid flow from the valve.

Abstract: An improved one-way fluid valve construction is provided. A valve housing (102) includes one or more valve ports (108) and control ports (110). A control member (304) is disposed within the control port (110). The control member (304) is movable within the control port (110) between a first position and a second position. A control rod (302) can extend between the control member (304) and a portion of the valve port (108). A control rod coupling (402) interacts with the control member (304) to cause a rotational or pivotal movement the control rod (302) through a predetermined angular arc in response to movement of the control member (304). A sealing face (404) formed on a second portion of the control rod (302) advantageously forms a seal with an orifice (316) that separates an input side of the valve port (108) from an output side. The seal can be formed when the control rod (302) is in a control rod sealed position.

Abstract: A pressure-reducing valve includes a housing, a pressure-reducing piston, a driving piston, and a spring mechanism. The housing is provided with a primary port and a secondary port. The pressure-reducing piston is displaceably retained in an interior of the housing. The pressure-reducing piston is displaced to control an opening degree of the primary port and configured to separate the interior of the housing into a primary-pressure space connected to the primary port and a secondary-pressure space connected to the secondary port. The driving piston is displaceably retained in the interior of the housing. The driving piston is displaced to cause the pressure-reducing piston to be displaced in association therewith and has a secondary-pressure receiving surface that receives a secondary pressure from a fluid in the secondary-pressure space. The spring mechanism is configured to exert a spring force against the secondary pressure to at least one of the pistons.

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: In one embodiment, a flow control valve includes a valve body having an inlet, an outlet, a flow passageway coupling the inlet to the outlet, and a cavity with first and second chambers. The valve further includes a hollow piston disposed in the first chamber and a seal separating the first and second chambers. The seal has a section within the piston that is exposed to the fluid in the first chamber. The section of the seal defines a first effective area. The valve also includes a biasing member configured to urge the piston, and a reference pressure passageway in fluid communication with the inlet and the second chamber. The valve can further include a piston seat that has a second inner effective area at least approximately equal to the first inner effective area.

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 fluid flow regulator in which fluid is passed through an impeller chamber having a pressure differential-operated impeller piston for monitoring changing inlet and outlet fluid pressures to maintain a constant fluid flow rate. A needle valve mounted on the body at one end of the impeller chamber engages an orifice opening to precisely change the fluid flow rate.

Abstract: An apparatus and method for regulating the pressure of fluid flowing though a conduit system according to which a valve seat is formed in a lower housing connecting in the conduit system with the seat extending between an upstream portion of the system and a downstream portion of the system. A valve stem is mounted in the lower housing for axial movement in the lower housing and one end of the stem is connected to a valve head. Two spaced membranes are mounted in the upper housing to define two chambers, and the membranes are connected to the valve stem . The downstream portion of the conduit system is connected to one of the chambers to apply a load to of the membranes in proportion to the fluid pressure in the downstream portion so that changes in the fluid pressure in the downstream portion causes corresponding changes to the load on the one membrane, corresponding movement of the valve stem and the valve head, and corresponding changes to the fluid flow through the lower housing.

Abstract: A device for limiting the flow rate of a fluid through a conduit operates autonomously without any external energy source, and independently of the level of pressure upstream, by operating on an imposed upstream-downstream pressure difference. The flow limiter is capable of limiting the rate of flow of a fluid through a pipe, the flow rate of the fluid depending on the cross section for passage of the fluid in the pipe, and on the difference between the upstream and downstream pressures relative to the passage cross section, in the direction in which the fluid flows.

Abstract: The present fluid level controlled automatic shutoff valve is comprised of a tubular housing with an axial bore which has an upstream closure, a downstream opening, and an annular piston seat at the downstream opening. A movable piston is positioned in the bore, and biased to a retracted position by a tension spring connected between the piston and the closure of the bore. A plurality of channels on the wall of the housing extend between an upstream end of the housing and the bore. The channels terminate in venturis downstream of the piston in the retracted position. The shutoff valve is positioned in a fluid dispensing device. When pressurized fluid is delivered through the dispensing device, the fluid is directed through the channels and out the venturis at high speed and low pressure.

Abstract: A first pressure chamber and a second pressure chamber are provided with means for continuously exerting a constant inward pressure on a first diaphragm part and a third diaphragm part respectively. A valve chamber having a flow control portion wherein a flow rate of the controlled fluid flowing from an inflow chamber to an outflow chamber is controlled by changing a size of the opening defined between a valve part and a valve seat, caused by a displacement of the valve part of a valve mechanism. A differential pressure chamber connects with the outflow chamber and has a bypass opening of a bypass passage connecting to the outflow passage.

Abstract: A regulator for maintaining a constant partial vacuum in a region, such as in a piece of process equipment or a fume hood. The regulator includes a path, through which fluid passes from the region to the vacuum source, and a movably mounted piston having a frontal face, which is exposed to fluid in the path, and a distal face, which is exposed to a reference pressure, such as the pressure of the environment in which the equipment is located. The piston is disposed in the path so that the piston may constrict the path at a constriction point. Fluid in the path upstream of the constriction point exerts a pressure on the frontal face of the piston that tends widen the path at the constriction point. The piston is mounted so that the weight of the piston exerts a force on the piston in a direction that tends to widen the path at the constriction point. A force is exerted on the piston, preferably by a spring under compression, in a direction that tends to narrow the path at the constriction point.

Abstract: A differential pressure detector for providing an output pressure modulated as a function of the pressure drop between the pressures upstream and downstream of a fuel metering device, comprising first and second input chambers for connection to said upstream and downstream pressures respectively, a modulated pressure output chamber, a sleeve which is linearly movable in response to changes in the difference between the pressures in the first and second input chambers, and a fixed slide valve which is partly received in the sleeve and which has a bore opening into the output chamber and at least one side port for communicating the first input chamber with the output chamber via the slide valve bore, the aperture of the side port being varied by linear movement of the sleeve to control the communication between the first input chamber and the output chamber. The detector has reduced reaction forces and is particularly suitable for use in a fuel flow regulating system.

Abstract: Gas control and dispensing assembly comprising a lower unit (1) which is mounted on a gas tank (4) and houses a regulator (10, 9) and an upper unit (5) which is mounted on the lower unit (1) via a threaded ring (24) and houses an indexed flowmeter valve (14, 43) upstream of a low pressure gas outlet (19). The invention is suitable for transportable gas tanks and vehicle-body integrated gas tanks.

Abstract: The present invention relates to a controllable constant flow regulating lift valve of a direct-acting automat ic control type that operates on an operating force derived from the condition of a working fluid, such as valve-inlet pressure prevailing in the inlet passage, valve-outlet pressure prevailing in the outlet passage, variation of liquid level on the side of the outlet and so on. The flow regulating valve comprises a flow regulating valve structure and a slide valve structure for automatic flow restriction control. In the controllable constant flow regulating lift valve, axial thrust acting on the spindle of a lift valve type flow regulating valve structure is balanced such that the constant flow regulating lift valve can be operated for constant flow regulation by a very small power.

Abstract: A differential pressure regulator and accompanying system enabling accurate metering of fluid under high-pressure, low-flow conditions. An annular passage within the fluid flow path of the regulator creates an additional pressure drop within the regulator to reduce fluid velocity within the regulator and associated wear problems. A ball and seat mechanism is specially sized with respect to a piston and provides improved accuracy.

Abstract: To measure and control the flow of fluid through a passageway, a venturi meter and a regulator are disposed in the passageway. The area of the cross-section gradually decreases and then gradually increases. The venturi meter also has first and second static pressure ports, the first port being located at a relatively wide portion of the venturi meter, and the second port being located at a narrower portion of the venturi meter. Each of the ports is disposed about the circumference of the venturi. A regulator, or another type of adjustable valve variably impedes flow through the passageway. A controller measures the static pressure at first and second ports and adjusts the regulator or valve based on the static pressure measured at the first and second static pressure ports.

Abstract: Valve device for controlling the delivery of pressurized fluid from a common pump to two hydrostatic working motors, one of which is subjected to a load dependent on the speed of the other motor. A volume flow regulator is disposed in the flow path between an inlet port of the valve device connected to the pump and an outlet port connected to the other working motor and varies the volume flow rate in this flow path in inverse proportion to the pressure in the inlet port to keep that pressure substantially constant.

Abstract: A demand responsive flow regulator valve for use with a power steering pump and steering mechanism has a valve spool slidably disposed in a housing and responsive to a pressure differential across an orifice for the purpose of bypassing excess pump flow. The flow control orifice establishes pressure signals proportional to pump flow to the steering mechanism. The pressure signals are operative on the valve spool to control the bypassing of excess pump flow. A spring loaded metering rod disposed in the flow control orifice increases the effective area of the orifice when pressure demand at the steering mechanism increases thereby increasing the fluid flow to the steering mechanism while simultaneously decreasing the bypass flow.

Abstract: A flow volume control device for use in a power steering system, which comprises: a casing having an inlet port, a reflux port and a delivery port; a fluid passage formed in the casing in communication with the inlet, reflux and delivery ports; fixed orifice means provided in the fluid passage to restrict the flow or pressurized fluid from the inlet port to the reflux and delivery ports; and throttle means provided in the fluid passage between the fixed orifice means and delivery port.

Abstract: A device for regulating the flow or outflow of liquids comprises an outer encasing tube, having a feed tube connected to an inlet and in which is a cylindrical hose coupling is disposed, which is tightly connected to an outlet. The liquid acts indirectly from the outside on the hose coupling via a gas cushion, so that a pressure difference occurs within the hose coupling, which leads to a bulging, and consequently, a cross-sectional reduction of hose coupling. The complete arrangement is arranged on the dry side of a container wall.

Abstract: A fuel supply control system including a major area diaphragm and a minor area diaphragm defining therebetween a reference pressure chamber. A control pressure chamber is located adjacent the major area diaphragm on a side thereof opposite to the reference pressure chamber and a controlled pressure chamber is located adjacent the minor area diaphragm on a side thereof opposite to the reference pressure chamber. A valve is connected to the diaphragms for regulating the opening of an orifice of a fuel passage and the controlled pressure chamber serves as a chamber of the fuel passage. The control pressure chamber is connected to a combustion air supply passage system, and the reference pressure chamber is connected to a portion of an air supply and exhaust passage system, in which the pressure is lower than the pressure in the combustion air supply passage system.

Abstract: A bladder, suitably formed of silicone rubber and molded into a cylindrical shape, is provided internally with a deforming spring. The resultant unit serves as a delivery stabilizer for a ventilation shaft without loss of elasticity of the bladder.

Abstract: An improved variable volume control assembly for conditioned air systems having an improved air flow amplifying sensing means that amplifies the difference between the total pressure and the static pressure and is sensitive at low pressures, an improved air flow collector-straightener, a critical ratio of the area of the inlet to the area of the expansion chamber, and a vortex filter strategically located within the assembly for maximum reduction of turbulence and noise.

Abstract: An adjustable bellows mechanism in a fuel control apparatus for balancing the internal forces of a valve arrangement to establish a fuel flow from the control apparatus to an engine corresponding to the optimum operational parameter of the engine.

Abstract: The invention relates to a furnace type air throttle assembly which operates in a manner to supply a constant volume of air per unit time. This is done with a bellows and throttle arrangement in which (1) the total pressure at the inlet, which is the sum of the dynamic and static pressure, is utilized to expand the bellows and move the throttle in a closing direction and (2) static pressure and weight means are utilized to compress the bellows and move the throttle in the opening direction.

Abstract: In an emission control system having an air pump for delivering air to the exhaust system of an internal combustion engine, a valve controls the air pump discharge pressure in a fixed relationship to exhaust pressure by diverting a portion of the air pump discharge air flow. As a result, the flow of air from the pump to the exhaust system is maintained as a constant proportion of the engine air flow.