Abstract: According to an embodiment of the disclosure, an apparatus for a flow of fluid includes a first and a second element that form an exponentially changing restriction between them for a flow of a fluid. At least one of the first and second elements is configured to move in response to changing pressures to change the restriction. One of the first and second elements includes a wall with one or more cutouts that have an admittance that changes exponentially with respect to the movement of the first or second element.

Abstract: A valve assembly (10) for large scale irrigation including a valve body (20) and a valve head (40). The valve head is adapted to reciprocally travel along a longitudinal axis, supported by a longitudinally aligned shaft (60) inside the valve body. The valve head includes a wall (41) terminating in a peripheral sealing contact surface (42), the wall extending inwardly from the peripheral contacting surface.

Abstract: A system and method for performing liquid volume determination in a smart environment, the method comprising involve determining that a liquid is being poured. The method includes identifying the liquid, and determining the liquid volume of the liquid being poured based on sound analysis of audio sensed by a microphone. A scenario in which the liquid is being poured is analyzed, and an action is determined based on the scenario. The action includes triggering an actuator of the smart environment, obtaining additional information about the liquid, or issuing an alert.

Abstract: A magnetically damped check valve having a non-magnetic metal sleeve and a spring-biased poppet disposed within the check valve. The spring-biased poppet is operably supported by the sleeve. A poppet guide is attached to the sleeve. The poppet includes a shaft that is slidably attached to the poppet guide. A portion of the shaft extends into the sleeve. At least one magnet is attached to the portion of the shaft that extends into the sleeve. The magnet therefore moves with the shaft as the poppet moves in response to changes in differential pressure across the check valve. The magnet produces a magnetic field. As the magnet moves within the sleeve, the magnetic field changes thereby inducing an electrical current in the sleeve which produces another magnetic field that opposes the magnetic field of the magnet thereby damping the movement of the magnet and hence, damping the movement of the poppet.

Abstract: A pressure regulating device for use with a breathing assistance and/or resuscitation apparatus, which conveys gases along a gases pathway to a patient, includes a mounting for connecting the pressure regulating device to a first outlet in fluid communication with the gases pathway. The mounting holds a valve member that selectively blocks, at least in part, the first outlet. A control member can be manipulated to adjust a property of the valve member. The valve member at least partially blocks the first outlet when the pressure of gases in the pathway is below a selected level, and allows at least a portion of the gases to flow out of the first outlet when the pressure of said gases is above the selected level. The property includes a selected level of pressure whereby manipulation of the control member adjusts the level of pressure between a maximum level and a minimum level.

Abstract: A nozzle check valve comprises a valve body (10) and a nozzle (20) centrally arranged within the upstream end of valve body (10), a fluid channel (90) is defined by the outer face of the nozzle (20) and the inner face of the valve body (10). A guide bush (60) is mounted on a nozzle axial extension (26) and an annular disc (30) comprising a disc sealing ring (31) connected to a central barrel (32,33) by a plurality of webs (34) is mounted on the guide bush (60) for axial movement of the annular disc (30) relative to the valve body to open and close the fluid channel (90). A spacer (80) is arranged on the nozzle axial extension (26) downstream of the guide bush (60) and a diffuser (40) is arranged on the downstream side of the spacer (80). A spring (50) between the annular disc (30) and the diffuser (40) urges the disc towards the valve closed position.

Abstract: A valve assembly for operation within a valve body of a pump includes an axial centerline, a poppet guide having a stem, and a poppet slidingly coupled to the poppet guide so that the poppet and the poppet guide define an internal cavity. The valve assembly also includes a flexible poppet guide mounting system coupled to the poppet guide and the poppet and includes a variable-area flow restrictor in fluid communication with the internal cavity. The flexible poppet guide mounting system is configured to support the poppet guide and the poppet for lateral and axial movement of the poppet guide and the poppet relative to the axial centerline. The poppet is movable relative to the poppet guide to adjust the volume of the internal cavity.

Abstract: A hand-held positive expiratory pressure device is presented. A float is insertable into an internal chamber of a housing and is urged towards a sealing surface by a biasing member to restrict or prevent airflow through the internal chamber. A user exhaling through the device urges the float away from the sealing surface to allow fluid to flow through the internal chamber. An adjustable stop positioned in the internal chamber selectively adjusts the amount of force exerted by the biasing member on the float.

Abstract: A failsafe hose comprising an inlet fitting assembly and an outlet fitting assembly wherein the inlet fitting assembly and outlet fitting assembly are interconnected by an inner conduit and an outer conduit and the inlet fitting assembly further comprises a dissolvable element and a piston wherein the piston held in an open position by the dissolvable element wherein a leak in the inner conduit will result in the fluid being directed to the dissolvable element by the outer conduit and a method for assembling same.

Abstract: A scroll compressor is provided that may include a casing including a rotational shaft, a cover fixed inside of the casing to partition the inside of the casing into a suction space and a discharge space, a first scroll revolved by rotation of the rotational shaft, a second scroll disposed on or at one side of the first scroll to define a compression chamber together with the first scroll, the second scroll including a discharge, through which a refrigerant pressed in the compression chamber may be discharged, a switching device movably disposed on or at one side of the discharge to selectively open and close the discharge, a back pressure portion including a moving guide that accommodates at least a portion of the switching device, and a top surface that covers one side of the switching device; and an adhesion preventer that reduces a contact area between the switching device and at least a portion of the back pressure portion.

Abstract: An exercisable check valve having a fluid delivery test channel and piston closure is disclosed herein. A valve closure member stops flow through the valve in the presence of backwards pressure or when engaged by the piston. The valve may be tested by applying a pressure source to the fluid delivery test channel to cause the piston to engage the valve closure member and stop flow through the valve. A test rod may then be inserted into a test rod port to ensure the valve closure member is in the proper closed position. The check valve may also include a biasing element to bias the valve closure member to an open position and a drainage channel. The check valve may be used in any piping or valve system.

Abstract: A double action directional fluid flow valve includes a stepped piston connected with a poppet valve and moveable by a controller between open and closed positions by applying a continuous pressure to a small diameter piston face and selectively applying and removing pressure from a large diameter piston face to move the poppet valve between an open position and a closed position.

Abstract: A valve member for a poppet valve is provided. The valve member may include a valve stem, a valve head, a face formed on the valve head, a sealing surface disposed between the face and the perimeter of the valve head, a tapered socket, and a bevel. The valve stem may include an outside surface defining a stem diameter. The valve head may include a maximum diameter greater than the stem diameter. The face may be formed on the valve head opposite the valve stem. The sealing surface may include a transition ring disposed between the perimeter of the face and the maximum diameter of the valve head. The tapered socket may be disposed in an end of the valve stem, defining an opening with a socket perimeter sized to receive a spring therein.

Abstract: A discharge valve including a tubular, valve seat and a valve guide disposed above the valve seat. The valve guide has a discharge passage plug and a guide rod that is affixed to, and projects downwardly from, the bottom of the plug. The valve guide also has an interiorly threaded, lifting sleeve that is affixed to, and projects upwardly from, the top of the plug. A piston is disposed between the valve seat and the valve guide. The piston has a conical, head portion for engaging the top of the valve seat, and a stem portion that is affixed to, and extends upwardly from, the head portion. The stem portion has a longitudinal socket within which the guide rod is slidably received. The stem portion also has a number of apertures that intersect the socket for providing pressure relief to the socket. A compressed spring is disposed between the valve guide and the head portion of the piston for normally retaining the head portion in engagement with the valve seat.

Abstract: A variable performance valve for use in a fuel nozzle is presented. The valve includes a spring, an inner spool having a port, an outer sleeve, and an orifice, which in a fuel nozzle application may be a calibration orifice. In a low flow condition, the inlet to downstream pressure is the spring force divided by the area on which the pressure acts. At low flow the orifice does not cause any appreciable pressure drop. As the flow increases, a pressure drop develops across the orifice. Since the pressure drop across the valve cannot be greater than the spring force divided by valve area, the valve is forced to open to compensate. As flow is increased, the valve will stroke completely open and the pressure drop at the port becomes negligible and the pressure drop across the orifice is nearly 100% of the pressure drop across the valve.

Abstract: The aim of the invention is to protect hydraulic assemblies, in particular those used for hydraulic longwall working in coal mining. To achieve this, pressure regulating valves (1) are used, the damping chambers of which (20) are located, configured and connected to the inlet side (5) in such a way that a system pressure constantly prevails in said chamber (20) and only drains in a restricted manner when the pressure in the regulating valve (1) is released, thus preventing the occurrence of detrimental vibrations.

Abstract: A poppet valve is disclosed that include a valve body, a poppet guide disposed inside the valve body so as to form a flow passage from a flow inlet to a flow outlet of the valve, a poppet shutter disposed inside the poppet guide, and a converging-diverging flow passage formed by a portion of an outer surface of the poppet shutter and a corresponding portion of an inner surface of valve body. A method for reducing a closing pressure force acting on a poppet shutter of a poppet valve is also disclosed.

Abstract: An LIFD valve assembly has a pressure balance device a pressure balance slide of which is urged in the opening direction by a pressure downstream of a metering aperture and in the closing direction by a control pressure preferably corresponding to the highest load pressure of a plurality of consumers, and a load pressure downstream of the metering aperture is reportable to a line via the pressure balance device, and a load-maintaining device that can be put in a closing position, in which position a pressure medium flow path from a consumer to the metering aperture is blocked. The pressure balance slide is embodied in divided fashion, with an upper part and a lower part, wherein the latter is guided on the upper part, and determines the pressure balance device throttle cross section with a pressure balance control edge and embodies a closing body of the load-maintaining device.

Abstract: A flow responsive valve for a flow metering system comprising a fluid meter having a minimum measuring flow threshold. The valve is shiftable between an open position at flow rates above the minimum measuring flow threshold, and a pressure pulsating position depending on pressure differential over an inlet port and an outlet port of the valve. The pressure pulsating position alters between a closed position essentially prohibiting fluid flow therethrough at flow rates below the minimum measuring flow threshold, and an open position admitting fluid flow into the supply line at a measurable flow rate above the minimum measuring flow threshold.

Abstract: A hydraulic control arrangement is disclosed for the load-independent control of a consumer with a continuously adjustable distribution valve having a pressure compensator down the line. According to the invention, the pressure compensator has a single-sided damping such that the movement in the opening direction is damped and the movement in the closing direction is substantially undamped. Furthermore, a control arrangement is disclosed in which a load-holding function is integrated in the pressure compensator.

Abstract: A discharge valve assembly is provided for preventing reverse rotation of a scroll compressor. The discharge valve assembly includes a cup-shaped valve member slidably engaged with a central post of a retainer member. The cup-shaped valve member includes notches in communication between the central post of the retainer and the sidewalls of the cup-shaped valve member.

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

Abstract: What is disclosed is a a pressure limiting valve comprising a valve body, the axial movement of which is damped by means of a damping device. In accordance with the invention, the damping device includes a damping chamber formed on the return side, that is subjected to the system pressure acting on a pressure port.

Abstract: A decoupled check-relief valve for use in a hydraulic fluid circuit is provided that has a cylindrical guide housing which travels during the check function of the valve. The cylindrical guide housing has a clearance parameter, allowing for the selection of an optimal check response time. A dampening disk is provided inside the cylindrical guide housing, traveling within the guide during the relief function of the valve. The dampening disk has a separate clearance parameter, allowing for the selection of an optimal dampening capacity and fluid circuit stability. As such, the check and relief clearance parameters are independent of each other to allow both the check and relief functions of the valve to be optimized.

Abstract: A pressure relief apparatus including a housing, a valve disposed in the housing, the valve having a first shoulder, a retainer disposed between the housing and the valve spool, the retainer having a second shoulder, a biasing member disposed between the first and second shoulders, and a metallic seal interface between the housing and the valve. The valve may be constructed with no dynamic elastomeric seals to reduce hysteresis.

Abstract: A device and method for preventing resonance in a fuel vapor pressure management apparatus of a fuel system supplying fuel to an internal combustion engine. The fuel vapor pressure management apparatus performs leak detection on a headspace of the fuel system, performs excess negative pressure relief of the headspace, and performs excess positive pressure relief of the headspace. The device includes a housing defining an interior chamber, a pressure operable device separating the interior chamber into first and second portions, and a device preventing resonance. The pressure operable device includes a poppet that is movable along an axis and a seal that is adapted to cooperatively engage the poppet. The device preventing resonance includes at least one of a dashpot defined by the housing and the poppet, a gap between the poppet and the seal, and a resilient element applying a force biasing the poppet toward the seal.

Abstract: A compressor check valve having a valve bolt and a valve bolt cover for noise reduction and mitigation of impact from a valve bolt on the valve bolt cover. A bolt insertion hole is provided in the cover to receive the valve bolt. A pressure conduction hole penetrating from the side of the valve bolt insertion hole of the cover through the exterior of the cover is provided on the cover to connect the high pressure chamber through the valve bolt insertion hole. A buffer section is formed on a top of the valve bolt insertion hole so that the valve bolt is forced by a high pressure coolant to move above and block the pressure conduction hole, the buffer section contains high pressure coolant prevented from being discharged through the pressure conduction hole to create a buffer action when the valve bolt moves upward so as to avoid direct impact against the valve bolt cover.

Abstract: A pressure relief apparatus including a housing, a valve disposed in the housing, the valve having a first shoulder, a retainer disposed between the housing and the valve spool, the retainer having a second shoulder, a biasing member disposed between the first and second shoulders, and a metallic seal interface between the housing and the valve. The valve may be constructed with no dynamic elastomeric seals to reduce hysteresis.

Abstract: The invention concerns a safety valve, in particular for low pressures and aggressive media, with an inlet which ends at the top in a valve seat upon which lies in a sealing manner a weight-loaded sealing body. A certain overpressure below the valve seat and/or a certain underpressure above the valve seat causes the sealing body to lift. At its upper end, the sealing body forms a shaft projecting vertically upward which is guided along or in a vertical part fixed immovably to the valve body. Fastened along or on top of the shaft are two or more weights, particularly detachable weights.

Abstract: A relief valve having a cylindrical case with one side thereof communicated with a fluid-pressure source, a relief piston accommodated in the cylindrical case and slidable therein, a return spring for pressing the relief piston against the fluid-pressure source, a damper chamber provided on a rear-surface side of the relief piston, said damper chamber communicated with the fluid-pressure source through an orifice of the relief piston and used for displaying a buffer action against an operation of the relief piston, and a relief hole bored through a wall of the cylindrical case, the relief hole communicated with the fluid-pressure source when the relief piston retreats due to an increase in pressure generated by the fluid-pressure source.

Abstract: A hydraulic distributor that has a regulating balance including a housing hollowed in the distributor body and containing coaxially a fixed central core. A tubular plunger is interposed sliding freely, coaxially, between the core and the housing and co-operates with a lateral orifice connected to a working orifice. The core and the plunger define between them an annular chamber. The plunger has a first radial annular surface subjected to the highest charge pressure (LS) and a second annular surface subjected to the pressure of the intake fluid. A central passage in the core constitutes a first orifice emerging at one end of the housing exposed to the highest charge pressure (LS). A second orifice emerges in the annular chamber and a third orifice is located opposite the other end of the housing and remains closed by the plunger as long as the charge pressure of the distributor is below the highest charge pressure (LS).

Abstract: A hydraulic system for a motor vehicle has at least one pressure restricting valve with a housing that has two or more connections. At least one conduit cross-section in the housing can be closed by means of a closing body that is movable axially against the action of an energy accumulator. At least a part of the axial travel of the closing body is damped by means of a damping device.

Abstract: A decouple check-relief valve for use in a hydraulic fluid circuit is provided that has a cylinder guide housing which travels during the check function of the valve. The cylindrical guide housing has a clearance parameter, allowing for the selection of an optimal check response time. A dampening disk is provided inside the cylindrical guide housing, traveling within the guide during the relief function of the valve. The dampening disk has a separate clearance parameter, allowing for the selection of an optimal dampening capacity and fluid circuit stability. As such, the check and relief clearance parameters are independent of each other to allow both the check and relief functions of the valve to be optimized.