Abstract: A fuel control valve (100) includes a rotary throttling valve assembly (4,7) providing one or more of the benefits of being lightweight, having a relatively low power consumption, having a fail-closed structure and/or zero leakage. The fuel control valve (100) is a rotary, throttling valve that is actuated via a rotary torque motor (70). The valve (7) can be spring loaded for providing positive shutoff. Position indication of the valve (7) is obtained via a position sensor (31) and cam (13) mounted to the throttling valve shaft at a driven end (98). In a de-energized state, a torsion spring (45) is provided that is loaded to rotate the valve (7) to the closed position. The fuel control valve (100) may be advantageously utilized in extreme operating environments, e.g., such as extreme temperature and vibration environments found in missile control fuel systems.

Abstract: A reduced gain thrust control valve for use in a rocket engine has a housing with a fluid inlet and a piston and cylinder unit for controlling a fluid output of the control valve. The fluid inlet is formed by at least one metering element formed in the housing. The at least one metering element has a rectangular portion for producing improved control stability, a tee and slot portion for controlling thrust during a start transient engine phase, and a fixed turbine bypass portion for accommodating a retainer. The retainer incorporates at least one fluid channel so as to produce repeatable fixed bypass flow metering.

Abstract: A valve uniquely integrates ball valve and throttling valve principals, thus affording quieter stop-and-start operation. A ball held by two seat rings is rotatable ninety degrees and has a diametric bore adjustable between fully closed (0°) and fully open (90°) positions. Oppositely disposed, relative to both the ball and the valve's longitudinal axis, are two plate assemblies each describing a tortuous fluid path. Each ring has conduits communicating with an assembly's tortuous path and communicable with the bore so that, sequentially during the ball's 0° to 90° rotation: the ball seals off the conduits, no fluid passing through the valve; all fluid passing through the valve flows through the plate assemblies and conduits; some fluid passing through the valve flows through the plate assemblies and conduits, some fluid passing through the valve flowing freely; the ball seals off the conduits, all fluid passing through the valve flowing freely.

Abstract: A valve assembly for reducing cavitation includes a seat disposed within a valve housing intermediate a fluid inlet and outlet thereof. A disc guide is associated with the seat so as to be slidably moveable relative to the seat. The seat includes a wall defining an inner-chamber and having elongated slots formed therein so as to direct fluid towards a central portion of the fluid chamber. The disc guide includes a wall having elongated slots formed on an upper portion thereof, and a non-slotted lower portion configured to substantially occlude the elongated slots of the seat when the disc guide is moved into a closed position.

Abstract: A flow-through pressure regulator having a housing, and a divider. The housing includes an inlet and an outlet disposed along a longitudinal axis. The divider separates the housing into a first chamber and a second chamber, and includes a seat, a diaphragm, a retainer and a flow diffuser member. The seat defines a passage between the first and second chambers. The diaphragm extends between the housing and the seat. The retainer secures the diaphragm to the seat, and may include a base portion proximate the seat, an intermediate portion extending along the longitudinal axis from the base portion toward the outlet, an end portion extending from the intermediate portion, and at least one aperture having a flow axis that permits fluid communication between the passage and the second chamber. The flow diffuser member is disposed between the passage and the outlet, and defines a plurality of flow paths.

Abstract: A damper apparatus for controlling airflow between compartments in a two compartment refrigerator having a door includes a controller for controlling opening and closing of a damper; and a door sensor connected to the controller for detecting when the door is open. If the controller determines that the door has remained closed for a set period, the controller maintains the damper in the closed position. A method for cleaning a damper in a refrigerator includes a steps of defrosting a refrigeration apparatus of the refrigerator, at least partially opening the damper, followed by waiting for a set period and then at least partially closing the damper. The steps of at least partially opening and waiting are repeated a set number of times and then a cooling operation of the refrigeration apparatus is commenced.

Abstract: A fluid energy reduction device especially for a flow control valve has a fluid inlet and a fluid outlet separated by a plurality of stacked plates in the form of a trim stack. Each plate of the stack has a plurality of rows of discrete, spaced columns that extend to the plate above in the stack. Fluid flowing through the trim stack is obstructed by the columns and is forced to divide into a plurality of subordinate flow paths. The rows of columns are staggered in such a way that fluid downstream of the first row of columns is incident directly on columns of the next row. The arrangement provides for the smooth pressure drop and energy reduction in the fluid without cavitation, noise or vibration.

Abstract: A fluid valve comprises a fluid conduit and a flow reducing device. The fluid conduit includes a fluid input end and a fluid output end. The flow reducing device comprises a first fluid passage and is configured to adjust the width of the first fluid passage. The first fluid passage has a narrow width over an extended flow distance that is delimited by internal walls that cause a pressure gradient in fluid passing through the first fluid passage. The flow reducing device further comprises a second fluid passage having a narrow width over an extended flow distance that is delimited by internal walls. The first fluid passage and the second fluid passage are parallel to each other. The flow reducing device further comprises a plurality of damping elements having surface portions parallel to each other. The facing surface portions of adjacent pairs of said damping elements define the internal walls delimiting the first and second fluid passages.

Abstract: A fitting for measuring the flow rate of a hydraulic medium through a pipeline having a cylindrical fitting housing with a main flow channel includes a flow meter device with a measuring element and an indicator element. A side chamber is formed in a side connecting piece of the fitting housing. The flow meter device is arranged in the opening of the side connecting piece closing it off to the outside. In a measuring bore that forms the forward flow to the side chamber, a rebounding plate of the measuring element is arranged, which is connected by an indicator rod with an indicator of the indicator element. The main flow channel between intake bore and the outlet bore of the fitting is formed by the measuring bore that leads into the side chamber, the side chamber itself, as well as a transverse bore that adjoins the side chamber. As a result, the entire flow of the main channel runs through the side connecting piece with the measuring bore and the side chamber.

Abstract: An accessory is easily attached to a faucet and is easily manipulated to increase the pressure of water flowing from the faucet. The accessory includes two plates, one of which is movable relative to the other one. Each plate has a plurality of water flow holes through which water from the faucet can flow. In one position, water from the faucet will flow through only one hole, thereby having a high pressure; while in a second position, water can flow through a plurality of holes thereby having a lower pressure. A handle is provided to move one plate with respect to the other plate.

Abstract: A method for achieving high flow in valves with small actuation distance is described. A detailed description for a silicon microvalve is provided. An algorithm is described for designing optimized valves.

Abstract: A high pressure valve for oxygen service comprises a valve body (10) with a gas passage (12) and a valve seat (18) associated with the gas passage (12). An obturation unit (22) is movable between a first position, wherein it is spaced from the valve seat (18), and a second position, wherein it is seated on the valve seat (18). This obturation unit (22) has a sealing surface (24) that is in sealing contact with the seat surface (20) in said second position of the obturation unit (22). A metallic sealing element (32) and a synthetic sealing element (34) co-operate to form the sealing surface (24). The metallic sealing element (32) forms the sealing surface (24) around said inner border of the seat surface (20), and the synthetic sealing element (34) forms the sealing surface (24) towards the outer border of the seat surface (20).

Abstract: A fluid pressure reduction device comprises a plurality of stacked disks having a perimeter and a hollow center aligned along a longitudinal axis. Each disk has at least one flow path extending between the hollow center and the perimeter, the flow path including an inlet section, an outlet section, and an intermediate section extending between the inlet and outlet sections. Each flow path intermediate section includes a pressure reducing structure and a recovery zone positioned immediately downstream of the pressure reducing structure.

Abstract: A precision modulating globe valve for controlling the flow of a fluid from zero to a maximum flow rate. The valve plug of the globe valve includes at least one flow modulating channel recessed from the outer surface of the valve plug. The outer surface of the valve plug engages a sealing member positioned along the inner surface of the valve port. The sealing member provides a fluid-tight seal between the outer surface of the valve plug and the valve port. The flow modulating channel is recessed from the outer surface of the valve plug from a minimum flow end to a maximum flow end. The radially recessed area of the flow modulating channel increases from the minimum flow end to the maximum flow end, such that as the valve plug moves past the stationary sealing member, an increased flow rate is created through the valve port.

Abstract: A valve assembly comprising a rotary closure element which defines an axis of rotation and is selectively movable between a fully open position and a fully closed position. Mounted to and movable with the rotary closure element is an impedance assembly. The impedance assembly defines an inflow end and an outflow end, and comprises a plurality of fluid passageways which extend from the inflow end to the outflow end. Also partially defined by the impedance assembly is a flow opening which extends from the inflow end to the outflow end. The fluid passageways and the flow opening are oriented relative to each other such that a portion of a flow through the valve assembly is directed into the fluid passageways and a portion of the flow is directed through the flow opening when the closure element is in the fully open position.

Abstract: A valve assembly comprising a rotary closure element which defines an axis of rotation and is selectively movable between a fully open position and a fully closed position. Mounted to and movable with the rotary closure element is an impedance assembly. The impedance assembly defines an inflow end and an outflow end, and comprises a plurality of fluid passageways of varying noise attenuating capability which extend from the inflow end to the outflow end. Also partially defined by the impedance assembly is a flow opening which extends from the inflow end to the outflow end. A retainer bracket is disposed within the flow opening and is cooperatively engaged to both the closure element and the impedance assembly.

Abstract: An ANSI Leakage Class V control valve having consistent shut off characteristics with a reduced actuator force required to open and close the valve is provided. The trim arrangement of the control valve includes a valve cage having a multi-contoured inner surface. The multi-contoured inner surface can include a plurality of surfaces. The multi-contoured surface can include first, second, and third perimeter surfaces, and a first transition surface disposed between and coupling the first and second perimeter surfaces, and a second transition surface disposed between and coupling the second and third perimeter surfaces. The valve also includes a valve plug disposed at one end of a valve stem. The valve plug controls the fluid flow through the valve. The valve plug includes an opening through the plug for equalizing pressure across the valve plug. An annular channel is formed within a wall of the valve plug and is sized to accommodate a sealing ring.

Abstract: What is disclosed is a method for manufacturing a valve piston, as well as a valve piston, wherein flow in the fine control range is determined through control windows formed by a through opening extending through the valve body.

Abstract: A gas regulating valve includes a valve housing. A tubular valve member is received in the valve housing, defines a valve space, and is formed with a valve seat. The valve seat defines a valve opening, and divides the valve space into a gas feed portion and a gas supply portion. A valve stem is provided with a valve piece that extends into and that is axially movable relative to the valve member. Rotation of the valve stem results in corresponding rotation of the valve member and further results in translation of the valve piece. Translation of the valve piece toward and away from the valve opening enables the valve piece to respectively reduce and increase amount of gas flowing from the gas feed portion into the gas supply portion through the valve opening.

Abstract: An annular valve seat is formed in a connecting path connecting a first main port and a second main port, a circular flow path wall having a diameter greater than a seat diameter is formed around the valve seat so as to surround the valve seat, a circular outer peripheral wall having a diameter greater than the seat diameter and smaller than a diameter of the flow path wall is formed at a disc-shaped valve member, and a restricted flow path is formed between the flow path wall and the outer peripheral wall when the valve member is fitted in the flow path wall.

Abstract: A valve and a valve assembly are provided that exhibit both highly controlled metering of fluid, as well as a high volume of fluid flow when the valve is in the fully open position. The regulating portion of the valve is provided with channels having different cross-sectional shapes, or channels having different lengths to provide staged flow. The valve is further provided with a fluid boundary element that is movably operably connected to the valve for mounting the valve to the valve body.

Abstract: A fluid distribution flow adjustment installation comprises a body having a fluid inlet tube opening up at one end facing a turnable metallic disk. The disk has drilled holes with precise dimensions such that there (1) is always at least one of these holes facing an outlet tube formed in the body, regardless of the position of the disk to enable fluid distribution without any risk of interruption even during adjustment of the flow, and (2) gradual adjustment of the flow as a function of the diameter of the holes and/or the density of the holes facing the outlet tube.

Abstract: A fluid pressure reduction device comprises a plurality of stacked disks having a perimeter and a hollow center aligned along a longitudinal axis. Each disk has at least one flow path extending between the hollow center and the perimeter, the flow path including an inlet section, an outlet section, and an intermediate section extending between the inlet and outlet sections. Each flow path intermediate section includes a pressure reducing structure and a recovery zone positioned immediately downstream of the pressure reducing structure.

Abstract: A fluid flow control device (10) has a stack of annular discs (15) defining a central passageway (14) and a plug (16) reciprocable in the passageway for controlling fluid flow. Adjacent discs (15) in the stack have at least one fluid passageway (21A) formed in a major face (22A) of one disc closed by the abutting major face of the adjacent disc. The fluid passageway (21A) extends in a clockwise direction and has a linear inlet portion (23A) and a curved outlet portion (24A). The inlet portion (23A) is of constant cross-sectional area and the outlet portion (24A) is of increasing cross-sectional are in the direction of fluid flow. Other configurations of discs and/or fluid passageways are disclosed.

Abstract: A valve is disclosed that is operable by converting rotational force of a stem into linear motion of a valve closure element, such as a sleeve, to control fluid flow through the valve. In a presently preferred embodiment, at least two interconnection members are rotatably mounted, such as with a round end, to a stem drive element. The interconnection members are slidably mounted into channels or grooves in a sleeve. Rotatable movement of the stem permits rotation of the interconnection members whereby the interconnection members are constrained to slide in the channels whereby rotational movement of the stem is converted into translational or linear movement of the valve closure element.

Abstract: A fluid control valve includes a valve body having a fluid passageway, a cage mounted in the fluid passageway, the cage including a wall defining a cage bore having an axis, and a valve plug assembly including a valve plug that is axially slidable in the cage bore. The cage defines one or more windows and a valve seat. Each of the one or more windows includes a plurality of slots each having a longitudinal axis. The longitudinal axis of each of the slots is parallel to or tilted at a relatively small angle with respect to a reference plane that is perpendicular to the cage bore axis. The longitudinal axes of the slots are preferably oriented at an angle of about 0° to 15° with respect to the reference plane.

Abstract: A flow conditioning apparatus, a separation system which includes the flow conditioning apparatus and cooperating downstream separation equipment, and a method of using the system are described. The system separates liquid components of differing densities from a fluid mixture. The flow conditioning apparatus includes an inlet, an outlet, and a swirl chamber extending along a swirl axis. The inlet and outlet cooperate with the swirl chamber to create a swirling of a fluid mixture passing through the swirl chamber to ideally induce coalescence of liquid droplets. The inlet and the outlet typically direct fluid to flow in a circumferential direction relative to the swirl axis to create a helical flow. The flow of the fluid mixture through the apparatus encounters a minimum of fluid shear and associated droplet dispersion.

Abstract: A process for manufacturing a valve trim assembly. The process comprises providing a flow disk having an outer diameter, an inner diameter, and an outer disposable flow disk portion, providing a separation disk having an outer diameter and an inner diameter, wherein the flow disk outer diameter is greater than the separation disk outer diameter, stacking the flow disk on the separation disk, and removing the outer disposable flow disk portion creating a reduced flow disk outer diameter. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 C.F.R. §1.72(b).

Abstract: A bi-directional head loss valve with a valve body having a flow path along a flow axis and a transverse valve actuation axis, an actuation shaft housing and a guide shaft mount disposed in opposition along the transverse valve actuation axis. A fixed plate is housed within the valve body transverse the flow axis, with downstream orifices parallel to the flow axis and a mobile plate is housed within the valve body upstream of and parallel to the fixed plate, with upstream orifices parallel to the flow axis. The mobile plate is adapted to move along the transverse valve actuation axis: from a fully open position, wherein the upstream and downstream orifices are in flow communication; to a fully closed position, wherein the downstream orifices are blocked by the mobile plate. An actuation shaft along the transverse actuation axis is slidably housed within the actuation shaft housing, and has an inner end engaging the mobile plate and an outer end adapted to engage a valve actuator.

Abstract: A fluid pressure reduction device comprises a plurality of stacked disks having a perimeter and a hollow center aligned along a longitudinal axis. Each disk has at least one flow path extending between the hollow center and the perimeter, the flow path including an inlet section, an outlet section, and an intermediate section extending between the inlet and outlet sections. Each flow path intermediate section includes a pressure reducing structure and a recovery zone positioned immediately downstream of the pressure reducing structure.

Abstract: A device for regulating the flow of gas from an environment. The device includes a shell forming a path through which fluid flows. A fixed grate is disposed in the path so that as fluid flows in the path the fixed grate does not move. A movable grate assembly includes one or more plates and a movable grate attached to the one or more plates. The one or more plates includes an integral hinge such that the plate can rotate about the integral hinge. When the movable grate moves with respect to the fixed grate the impedance on the flow varies.

Abstract: A valve assembly comprising a rotary closure element which defines an axis of rotation and is selectively movable between a fully open position and a fully closed position. Mounted to and movable with the rotary closure element is an impedance assembly. The impedance assembly defines an inflow end and an outflow end, and comprises a plurality of fluid passageways of varying noise attenuating capability which extend from the inflow end to the outflow end. Also partially defined by the impedance assembly is a flow opening which extends from the inflow end to the outflow end. A retainer bracket is disposed within the flow opening and is cooperatively engaged to both the closure element and the impedance assembly.

Abstract: A multiple opening sleeve valve is provided with a gate movable to control flow or pressure without the need for axial movement of a component through a pressure-containing seal. A gate actuator can include a drive rod and nut coupled to a gate substantially internal to the valve housing without the need for grease or similar external lubrication. The valve can provide for relatively high in-line gate-moving force, a reduction in force or torque requirements for operation, increased ease of wear-part replacement and decreased overall valve length, compared to previous valve configurations of comparable size or capacity.

Abstract: A guided control valve comprising a vapor recovery area that encourages collapse of vapor bubbles. In a cage-guided valve, a seal comprising inner and outer members reduces flow through a radial clearance between a plug and a cage. The vapor recovery area is positioned below the seal and above a seat interacting with the plug. The vapor recovery area encourages collapse of vapor bubbles to reduce damage to the valve trim.

Abstract: The seal assembly is disclosed for use with a valve having a trim cage with an inner surface extending along in axis and a plug sized to fit inside the trim cage inner surface, wherein the plug is adapted to move along the axis thereof. A seal ring is attached to an upstream portion of the cage to effectuate a seal with the plug. The plug is equipped with a wiper seal that cleans or otherwise removes debris from the seating surface of the seal ring, an interior surface of the seal ring and an interior surface of the cage during both the opening and the closing of the valve. Thus, the valve is self-cleaning. Further, the wiper seal delays throttling action through the valve until the plug has moved a substantial distance away from the seating surface of the seal ring which reduces high pressure abrasive flow against the seating surface of the seal ring to reduce wear on the trim set.

Abstract: A valve assembly comprising a rotary closure element which defines an axis of rotation and is selectively movable between a fully open position and a fully closed position. Mounted to and movable with the rotary closure element is an impedance assembly. The impedance assembly defines an inflow end and an outflow end, and comprises a plurality of fluid passageways of varying noise attenuating capability which extend from the inflow end to the outflow end. Also partially defined by the impedance assembly is a flow opening which extends from the inflow end to the outflow end.

Abstract: A valve assembly comprising a rotary closure element which defines an axis of rotation and is selectively movable between a fully open position and a fully closed position. Mounted to and movable with the rotary closure element is an impedance assembly. The impedance assembly defines an inflow end and an outflow end, and comprises a plurality of fluid passageways which extend from the inflow end to the outflow end. Also partially defined by the impedance assembly is a flow opening which extends from the inflow end to the outflow end. The fluid passageways and the flow opening are oriented relative to each other such that a portion of a flow through the valve assembly is directed into the fluid passageways and a portion of the flow is directed through the flow opening when the closure element is in the fully open position.

Abstract: A valve assembly comprising a rotary closure element which defines an axis of rotation and is selectively movable between a fully open position and a fully closed position. Mounted to and movable with the rotary closure element is an impedance assembly. The impedance assembly defines an inflow end and an outflow end, and comprises a plurality of fluid passageways of varying noise attenuating capability which extend from the inflow end to the outflow end. Also partially defined by the impedance assembly is a flow opening which extends from the inflow end to the outflow end.

Abstract: A fluid control valve includes a valve body having a fluid passageway, a cage mounted in the fluid passageway, the cage including a wall defining a cage bore having an axis, and a valve plug assembly including a valve plug that is axially slidable in the cage bore. The cage defines one or more windows and a valve seat. Each of the one or more windows includes a plurality of slots each having a longitudinal axis. The longitudinal axis of each of the slots is parallel to or tilted at a relatively small angle with respect to a reference plane that is perpendicular to the cage bore axis. The longitudinal axes of the slots are preferably oriented at an angle of about 0° to 15° with respect to the reference plane.

Abstract: A spool valve includes a groove defined in the spool and a notch. A line A is drawn to extend through a communication zone a provided upon communication of the notch which is disposed at a distal end of the line A and defined in a step of a spool with an input port to form a 69° angle with respect to an L-axis. Fluid flowing into the groove through the communication zone a upon communication of the notch with the input port, does not collide with other portions of the spool before colliding with a bottom of the groove. Therefore, the flow of the fluid along the L-axis causes a flow force applied to the spool to be suppressed resulting in a decreased load on an actuator. The notch makes it is possible to ensure the stable operation of a spool valve, while preventing the self-induced vibration of the spool.

Abstract: The present invention provides a cost effective means by which pressure reduction in a fluid flow control device is optimized. The pressure reduction achieved according to the present invention also minimizes valve wear and presents new solutions in reducing, attenuating, eliminating, damping, redirecting, or otherwise defeating valve noise. In accordance with one embodiment of the present invention, a flow control device is provided including a valve trim assembly comprising a plurality of valve trim disks defining a plurality of flow paths along a fluid passage between a fluid inlet and a fluid outlet of the flow control device. Respective flow paths defined by the valve trim disks comprise an expansion/contraction mechanism, a velocity control mechanism, an acoustic chamber, and frequency shifting passages. The expansion/contraction mechanism has a cross section including rapid increases and decreases in cross-sectional flow area.

Abstract: A vacuum control valve comprises a valve chamber with a valve opening which has a portion with a cylindrical inside wall on which an elastic sealing washer is provided. A closing body is included which comprises a cylindrical portion with a first end and a second end, adjoined by a portion of the closing body that widens into a cone, wherein at least one groove is present in the cylindrical portion of the closing body which extends to the first end of the cylindrical portion and which either widens along its extent to the first end, or deepens, or widens as well as deepens.

Abstract: A valve and a valve assembly are provided that exhibit both highly controlled metering of fluid, as well as a high volume of fluid flow when the valve is in the fully open position. The regulating portion of the valve is provided with channels having different cross-sectional shapes, or channels having different lengths to provide staged flow. The valve is further provided with a fluid boundary element that is movably operably connected to the valve for mounting the valve to the valve body.

Abstract: A fluid control valve includes a valve body having a fluid passageway, a cage mounted in the fluid passageway and a valve plug assembly including a valve plug. The cage has a cage bore and defines one or more windows, a valve seat located below the windows and a flow control portion of the cage bore located between the valve seat and the windows. The flow control portion has an interior contour that varies in dimension as a function of distance from the valve seat. The flow control portion provides precise control in low flow conditions. The cage may further define a sealing lip located above the windows. The valve plug assembly may include a deformable sealing ring for engaging the sealing lip when the valve plug is in a closed position. The deformable sealing ring permits valve plug travel that is substantially free of sliding seal friction.

Abstract: Discharge valve for an airbag including a fixed member adapted to be arranged in connection with or associated with the airbag and having a pattern of openings and a movable member having a pattern of openings substantially identical to the pattern of openings of the fixed member. The movable member is movable relative to and alongside the fixed member to vary the correspondence between the openings on the movable member and the openings in the fixed member to thereby vary valve openings defined by the fixed member and the movable member. Variation in the valve openings results in control and/or regulation of the outflow of gas from the airbag through the discharge valve. The members may be plates, cylinders or cones.

Abstract: A fluid control valve includes a valve body having a fluid passageway, a cage mounted in the fluid passageway and a valve plug assembly including a valve plug. The cage has a cage bore and defines one or more windows, a valve seat located below the windows and a flow control portion of the cage bore located between the valve seat and the windows. The flow control portion has an interior contour that varies in dimension as a function of distance from the valve seat. The flow control portion provides precise control in low flow conditions. The cage may further define a sealing lip located above the windows. The valve plug assembly may include a deformable sealing ring for engaging the sealing lip when the valve plug is in a closed position. The deformable sealing ring permits valve plug travel that is substantially free of sliding seal friction.

Abstract: A vacuum control valve comprises a valve chamber with a valve opening which has a portion with a cylindrical inside wall on which an elastic sealing washer is provided. A closing body is included which comprises a cylindrical portion with a first end and a second end, adjoined by a portion of the closing body that widens into a cone, wherein at least one groove is present in the cylindrical portion of the closing body which extends to the first end of the cylindrical portion and which either widens along its extent to the first end, or deepens, or widens as well as deepens.

Abstract: What is disclosed is a method for manufacturing a valve piston, as well as a valve piston, wherein flow in the fine control range is determined through control windows formed by a through opening extending through the valve body.

Abstract: A fluid pressure reduction device comprises a plurality of stacked disks having a perimeter and a hollow center aligned along a longitudinal axis. Each disk has at least one flow path extending between the hollow center and the perimeter, the flow path including an inlet section, an outlet section, and an intermediate section extending between the inlet and outlet sections. Each flow path intermediate section includes a pressure reducing structure and a recovery zone positioned immediately downstream of the pressure reducing structure.

Abstract: A pressure reduction valve for a compressible fluid has an inlet and outlet separated by a pressure reduction member having a plurality of convergent-divergent nozzles High pressure gas or vapour passes from the valve inlet through the nozzles which control the expansion of the gas/vapour to a reduced pressure and eliminate shock waves. The gas/vapour expands into an intermediate attenuation chamber in which the resulting turbulence is confined before the gas/vapour passes through the diffuser into the outlet such that the diffused streams do not interact. The invention provides for pressure reduction with significantly reduced noise levels.