Abstract: A flow control device including an elongate body with a central longitudinal flow passage with upstream and downstream ends; an elastic orifice plate with a central orifice extending transverse the flow passage; and, a diffuser part projecting into the flow passage downstream from the plate and upon which a jet of fluid issuing and flowing downstream from the orifice in the plate impinges and is diffused; the diffuser part is placed downstream from the plate a distance so that it serves to diffuse the jet of liquid before its movement downstream in the flow passage generates a minus downstream of the plate.

Abstract: A valve is provided with a throttle member that is capable of metering the flow between a bore channel of the valve and a port extending between the channel and an external location. The throttle member, or metering device, is a partial cylinder formed to include a plurality of deformations in its surface. The deformations can be slots that are shaped to receive a thread of a rotatable threaded member also attached to the valve body of the valve. Rotation of the threaded member can be arranged to cause the throttle member to rotation about the central axis of the channel and edges of the partial cylinder, which are circumferentially spaced apart from each other, can move into interfering relation between the port and the channel to partially block and meter flow therebetween.

Abstract: A pneumatic calibration system and the pump therefore, the system comprising a first fluid containing chamber for attachment to a device to be tested, a valve coupled to the first chamber to remove the fluid from the first chamber and a pump structure for providing a predetermined pressure to the fluid in the first chamber. The pump comprises a first piston disposed and moveable within first chamber to vary the volume of first chamber, a second piston, a second fluid containing chamber communicating between the first piston and the second piston, the second piston providing a predetermined pressure to the fluid in the second chamber and an expanding sleeve valve communicating between the first chamber and the second chamber to minimize the pressure differential across the first piston. The position of the first piston is adjustable in the first chamber. The second chamber includes a first portion and a second portion with a sleeve valve disposed therebetween.

Abstract: The present invention provides a control valve with an improved closing function that functions over a long period of time and the flow rate control can be carried out over a wide range.A valve body (1) is provided inside thereof with a partition (4) separating an inlet passage (2) and an outlet passage (3). The partition (4) is provided with an opening portion (5) communicating the inlet passage (2) and the outlet passage (3).A shutoff valve (10) is disposed opposite the opening portion (5). The diameter of the opening portion (5) is increased and curves toward the side of the shutoff valve (10).A control plug (12) is arranged on and projected from the lower end of the shutoff valve (10); said control plug being located on the large diameter side of the opening portion (5), is coaxial with the opening portion (5), and has a flange portion (12a) defining an orifice (14) between the inner surface of the opening portion (5) and the flange portion.

Abstract: The present invention relates to a proportional valve, in particular for fuel dispensing systems, to recover fuel vapor to the gas station tank. According to the invention the valve member is defined by a tandem piston arrangement to increase safety and accuracy in controlling the vapor volume to be recovered. The invention further relates to a valve arrangement for fuel dispensing systems having a plurality of fuel nozzles.

Abstract: A fluid flow control valve includes a valve disk having a labyrinthine partition extending from its face. The partition describes a closed shape. The partition faces a valve seat. The range of control over the flow rate of a fluid is controlled by the length of the partition. Partition lengths are created by their shapes. Several complex shapes, giving rise to differing partition lengths are disclosed. An actuator urges the valve disk toward the valve seat to provide final control of the fluid flow.

Abstract: A rotary servo or throttle valve comprises a housing defining a chamber and discharge port in fluid communication with the chamber, a rotary valve spool for delivering fluid into the chamber, and a system for delivering pressurized fluid passing from the outlet opening of the valve in the chamber to the discharge port in the housing in which non-cavitating technology can be readily incorporated. The outlet opening of the valve spool is a wedge shaped groove formed in its periphery, the groove having opposed, arcuately diverging sidewalls. The diffusing system comprises an elongated member which may be rotated in the chamber to align a plurality of flow paths with the discharge port and the outlet opening. The elongated member and valve spool may be rotated independently in opposite directions to obtain faster flow rate changes.

Abstract: A suction transporting device for transporting a material has a suction unit, a transporting line connected with the suction unit and having an inlet for receiving a material to be transported and an outlet for discharging the material to be transported and a unit for modulating a suction force of a suction produced in the transporting line by the suction unit, the modulating unit including a passage adapted to communicate the interior of the transporting line with atmosphere, an adjusting element operative for adjusting an initial area and shape of a minimal cross-section of the passage, and a valve mechanism including a drive, a speed controller for controlling a speed of the drive, and a valve body connected with the drive and cooperating with the passage so that when the valve body is displaced by the drive, an initial area and shape of the minimal cross-section of the passage is periodically changed.

Abstract: A metering pin is provided having two portions of different external configuration, each of which portions are insertable into the fluid flow path for restricting fluid flow under different actuating conditions. These two portions can be dimensioned to be readily retrofit into various existing nipple drinkers according to the configuration of the drinker inlet. The specific dimensions of each portion relative to the drinker inlet can be selected according to desired flow rates at different levels of poultry growth.

Abstract: A gas control valve including a body having a throat formed in a bore, a post slidably received in the bore and including a plug, a pin laterally engaged on an upper portion of the post, and a spring for biasing the post so that the plug can be separated from the throat and so that gas may flow through the throat, and a guide fixed in top of the bore and having two inclined surfaces, the ends of the pin are slidable along the inclined surfaces, the plug can engage with the throat when the knob is pushed toward the body so that gas is prevented from flowing through the throat.

Abstract: A regulator cone of substantially cylindrical form is disclosed with four generally V-shaped grooves on its outer circumferential surface. Two of the grooves define primary grooves that extend along the entire active length of the regulator cone. The other two grooves define secondary grooves that extend along the portion of the active length of the regulator cone where the primary grooves have their largest cross-sectional area.

Abstract: A valve provided with sound-reducing means, which sound-reducing means comprise a porous member.

Abstract: A flow control valve includes: an inlet casing concentric to a spindle; an outlet casing coupled with the inlet casing, an inlet portion of the outlet casing having a countersunk edge part; a head having two notches in the surface of a cylindrical portion, the head being put into the outlet casing; and a disk shaped as a truncated cone which is continuously provided to the head, the disk coming into contact with the countersunk edge part.

Abstract: An externally adjustable restriction control assembly for a poppet valve. The restriction control assembly is actuated through rotation of the valve stem. Upon rotation of the valve stem, a restriction control disc, threadably mounted to the valve stem guide, is moved toward or away from a seat provided within the housing. Movement of the restriction control disc thereby adjusts the effective cross-sectional flow area through the valve.

Abstract: An axicage multistage choke (10) wherein fluid flow is caused to impinge upon itself at each stage. Fluid entering inlet (14) is distributed by primary annulus (32) around the interior of upper cage (30). Fluid enters upper cage port (36) and impinges on itself in axial chamber (37). Fluid leaves chamber (37) through stem slots (38) into secondary annulus (42). From secondary annulus (42) fluid passes through lower cage ports (46) into axial chamber (47), again impinging on itself and dissipating energy. Fluid leaves choke (10) through outlet (16). Additional stages maybe added depending on the flow rate or pressure drop desired in the valve.

Abstract: An in-line sleeve valve has a housing and a sleeve. A sleeve gate is slidably mounted to the sleeve. A velocity guide is mounted to the sleeve gate. The velocity guide, sleeve, and sleeve gate define a passage to rapidly equalize the pressure across the velocity guide upon initially opening the valve. A drive assembly has arms mounted to the housing for swinging movement. The sleeve gate has grooves for receiving slide blocks. A drive pin is pivotally mounted at the lower end of each arm to a slide block, the pin having a threaded portion and a nonthreaded portion. Each slide block has an opening receiving the nonthreaded portion of the pin, and each arm has a threaded opening threadedly engaging the threaded end of the pin. The drive assembly also has an actuator having a piston. Ends of the drive arms are rotatably connected to a drive bar. A mounting pin has an upper cylindrical portion and a lower tapered portion.

Abstract: The present invention seeks to provide a simple, low cost and easy-to-install (or remove) device for two-cycle engines which improves engine efficiency through more complete combustion, resulting in increased engine rpm and a decrease in emissions. The invention specifically relates to an insert device which is located upstream of the carburetor, preferably in a coupler which typically extends between an air cleaner and the carburetor of a two-cycle engine. The insert itself is generally formed as a tubular member (of one or more pieces) tapering from a larger inlet side to a smaller outlet side, with or without surface irregularities, i.e., ribs, flutes, etc., formed on its interior surface. It is important that the tuned air insert be located such that its lower edge, i.e.

Abstract: An auxiliary air control valve for engines wherein the valve has an intermediate peripheral portion enlarged to present a small gap to the valve seat port, and the front side of the intermediate peripheral portion and the rear side thereof formed to have slant surfaces so as to be diametrically and gradually reduced so that when the cooling water is at a low temperature, the front slant surface is positioned at the valve seat port, when the cooling water is at an intermediate temperature, the intermediate peripheral portion is positioned at the valve seat port, and when the cooling water is at a high temperature, the rear slant surface is positioned at the valve seat port, thereby being capable of controlling the quantity of intake air through the bypass passage.

Abstract: The present invention is directed toward an air and liquid product flow control element that can be adjusted to vary the flow of liquid dessert product and ambient air into the freezing chamber of a frozen confectionery dispensing machine. The invention is an air tube with a varied opening on its circumferential skin near one end, and a moveable sleeve that fits around the air tube. The air tube is positioned in the reservoir of liquid dessert product with its varied opening being submersed into the liquid. The air tube connects the freeze chamber with the ambient air above the liquid reservoir and allows liquid to flow through the varied opening into the freeze chamber.The moveable sleeve that fits around the air tube extends from the ambient air above the liquid reservoir, down to the varied opening. By moving the sleeve up and down along the air tube, the sleeve blocks part or all of the varied opening.

Abstract: Disclosed is a cartridge-type flow control valve principally for use in public drinking fountains. The cartridge-type valve includes a substantially cylindrical housing open at one end. Mounted within the housing is a fluid transfer member which includes an integrally formed fluid transfer chamber, inlet nozzle and outlet nozzle. A valve stem slidably extends into the fluid transfer chamber and is sealed by means of O-rings. The valve stem includes a substantially cylindrical eccentric protrusion which can be used to regulate the amount of flow through the cartridge valve. The eccentric protrusion is adjacent to the inlet bore to the fluid transfer chamber and thus, by rotating the valve stem, the gap between the eccentric protrusion and the inner wall of the fluid transfer chamber at the inlet bore can be varied. Varying this gap allows some amount of flow control.The valve stem has attached thereto a valve stem cap.

Abstract: A valve is provided preferably having a moulded plastic valve plug with a plurality of preferably arcuate grooves circumferentially spaced in the forward surface of the plug. The arcuate grooves distribute fluid flowing between the plug and valve seat substantially equally about the periphery of the valve plug. Fluid is also directed by the grooves to flow between a sealing surface of the plug and the valve seat in an outward radial direction substantially parallel to the valve seat. The resulting fluid flow reduces cavitation, valve stem chatter, noise and vibrations as well as reducing erosiion of the valve seat. An inner portion of the plug is made of a relatively high tensile strength material having a low thermal expansion rate whereas an outer portion of the plug including the plug sealing surface is made of a material having a relatively low surface hardness.

Abstract: A shut-off valve for use with high pressure gas cylinders is disclosed which is adapted to automatically retain a residual pressure in the cylinder. The valve includes a check plug axially moveable within the housing which has a hard sealing surface, for establishing high pressure seals and a soft sealing surface for establishing low pressure seals. The plug is spring-biased into the closed position with force selected so that it automatically closes and seals the interior of the cylinder once the gas pressure in the cylinder drops to or below a predetermined threshold pressure.

Abstract: A flow control valve to regulate the bleed flow rate of a pressurized vessel at one of only two available bleed flow rates. The flow control valve comprises an axial main gas flow passageway with an integral check valve that allows pressurization of the vessel, a bleed passageway for depressurization of the vessel, and a threaded bleed passageway cap that allows bleeding of the vessel at one of only two rates available, based on the counter-rotated position of the bleed cap.

Abstract: A throttling valve that has an outer ring unit having a plurality of superimposed cylindrical shaped outer throttling rings that define a series of annular passages between the rings. An inner ring unit also having a plurality of superimposed cylindrical shaped inner throttling rings is adapted to movably support the inner rings within the annular passages to establish elongated flow orifices between the adjacent surfaces of the rings. The geometry of each orifice is arranged so that the fluid in transit remains attached to the control surfaces of each orifice and to insure that the static pressure along the length of the orifice remains above the dynamic pressure. The tip region of each orifice is provided with a diverging flow section to further insure quiet performance along the entire length of the orifice.

Abstract: A flow control having a wide flow rate range and excellent linearity between the degree of valve opening and flow rate. The valve includes a cylindrical or conical valve head formed on a circular-truncated-cone-shaped working face which is tapered towards the outlet of the valve with the valve head being located inside the outlet-side casing. With respect to the area of the valve opening defined by the valve head and the valve seat, the valve head is shaped so that the rate of change of the flow rate with valve stroke is small and linear, whereby fine control of the flow rate can be accurately achieved over the entire flow rate range. The valve stroke to fully open the valve occurs in the inlet-side casing. A servo motor or the like is employed as the drive source for operating the valve.

Abstract: In a valve having a plug and valve seat for controlling the flow of fluid between an inlet port and an outlet port, the plug has radial serrations on its bottom face and has a length for establishing turbulence during the last 1/4 of its stroke as the plug is lifted from the valve seat, the flow through said valve seat being modulated by the turbulence.

Abstract: A toilet refill valve is described for refilling a water closet after each flushing, which produces minimal noise during the refill process. The valve includes a valve device which can open to pass water to a vertical outlet tube that empties into the bottom of the water closet. An anti-siphon air tube near the top of the outlet tube has an upper end open to the atmosphere and a lower end facing downwardly along the outlet tube. A restriction in the outlet tube below the air tube, causes water to fill the outlet tube and at least the bottom of the air tube for a water inlet pressure of at least 20 psi. The water at the bottom of the air tube prevents air from being dragged into the downwardly facing air tube, to avoid the noise that would result from such air flowing through the air tube and bubbling out of the bottom of the outlet tube.

Abstract: A solenoid valve plunger 23 has a conical tip portion 25 which is insertable into a valve seat 5 to close it, a cylindrical portion 24 slidable within a magnetic plate 2, and an annular raised portion 26 for deflecting a fluid flow between the conical portion of the plunger and the valve opening away from the magnetic plate. Alternatively, the plunger may have a nonmagnetic conical tip portion 32 which is insertable into the valve opening to close it, and a partially nonmagnetic cylindrical portion slidable within the magnetic plate, the magnetic plate having a nonmagnetic guide portion 35. Both constructions avoid the impeding accumulation of magnetic particles at the plunger base.

Abstract: A hydraulic pressure control valve comprises a valve body having a slide bore of a circular cross-section and an inlet port and an outlet port opened into an inner surface of the slide bore at axially spaced apart points, and a valve spool slidably received in the valve body for axially sliding movement and defining, by cooperation with the valve body, a variable orifice for controlling the degree of communication between the inlet and outlet ports. In the hydraulic pressure control valve, a smaller diameter portion defining an annular oil passage between an inner surface of the slide bore is provided on the valve spool coaxially with the slide bore to define the variable orifice, and has an outside diameter set constant over axially entire length. This facilitates the dimensional control of the variable orifice, so that the variation in property of the variable orifice for every hydraulic pressure control valve may be easily suppressed.

Abstract: A shut-off valve for use with high pressure gas cylinders is disclosed which is adapted to automatically retain a residual pressure in the cylinder. The valve includes a check plug axially moveable within the housing which has a hard sealing surface, for establishing high pressure seals and a soft sealing surface for establishing low pressure seals. The plug is spring-biased into the closed position with force selected so that it automatically closes and seals the interior of the cylinder once the gas pressure in the cylinder drops to or below a predetermined threshold pressure.

Abstract: The subject flow proportioner device has a pivoting target plate opposite an inlet and between a pair of axially aligned exit ports. Product is introduced through a flow shaping inlet and strikes a profiled target on the plate forming a cushion and diverting the subsequent product between the outlets.

Abstract: A throttle device for applying a back pressure to a high viscosity point in an airless paint supply system. The throttle device comprises a tube member having an inner through hole and an elongated core member inserted in the tube member and extending along the length of the tube member. A support means supports the core member relative to the tube member and a clearance is provided between the tube member and the core member to constitute a passage for the paint, the clearance being equal to or larger than 1.5 millimeters, and the length of the tube member being selected in relation to the clearance so as to cause a required loss of pressure.

Abstract: Arrangement for controlling and regulating a liquid (2) flowing through a line (3). The arrangement comprises a valve body (9) provided with a press-on or deforming element (11) moveable along the line and designed to cooperate with the said line for regulating the flow of the liquid (2), by means of restriction thereof to varying degrees. In the line (3) there is fitted a continuous hollow element (4) having a number of openings (8) through which the said liquid can flow. The press-on element (11) moveable along the hollow element (4) is designed to press the line (3) against the said element (4). By this means a shifting of the press-on element can be carried out such that an optional area of the openings can be uncovered for throughflow since that part of the hollow element where the said area is located is situated on the outlet side in relation to the press-on element.

Abstract: The invention relates to a priority valve for a hydraulic installation having a main circuit and an auxiliary circuit. The priority valve has a slide member which primarily has a controlled throttle for dividing the supply fluid between the main and auxiliary circuits in accordance with the priority demands of the main circuit. The priority valve has a flow path leading to the auxiliary circuit which has throttle elements in series which provide pressure drops in steps to minimize cavitation when there is a rapid flow of fluid in the auxiliary circuit.

Abstract: The invention is directed to a valve wherein the valve closure body includes two bracing elements lying in contact engagement with the inner wall surface of the wall casing of a conduit. The two bracing elements are disposed in spaced relationship to each other so that this spacing defines a squeeze zone at which a squeezing pressure can be applied. The squeeze zone has a length which corresponds approximately to the wall spacing within the sleeve. When the elastic wall casing of the conduit is squeezed in the squeeze zone, a portion of the casing deflects to allow passage of a fluid through the conduit.

Abstract: This relates to a valve assembly or hydrant which is particularly suitable for use in conditions where freezing temperatures may be encountered, such as in water supply systems for snowmaking equipment and the like as commonly used in ski resort areas. The valve assembly comprises a valve body, a perforated valve insert in the valve body, a control member movable along the valve insert, and a ball engaging a valve seat in the valve insert. Movement of the control member releases the ball and then progressively opens the perforation thus providing accurate and stable flow control under a wide range of back pressures. The flow closure and control are separate from one another and the shut-off is not prone to failure or fouling as a result of debris in the water supply. The valve assembly can be controlled in such a manner as to provide a straight line flow versus valve opening position function.

Abstract: A control valve particularly for use in a steam power plant includes a hollow valve body having a pair of aligned openings therethrough. A cylindrical valve bonnet extends through one of the openings in the valve body and is secured to the valve body. A cylindrical plug guide is secured to the end of the valve bonnet within the valve body and extends lonitudinally from the valve bonnet to the other opening in the valve body. A stationary valve seat is secured to the end of the plug guide adjacent the other opening in the valve body. A valve plug is slidably mounted in said valve guide and valve bonnet for movement toward and away from the valve seat. Actuating means extends through the valve bonnet and is connect to the valve plug for moving the valve plug into and out of engagement with the valve seat.

Abstract: A thermal modulating control valve for providing bleed air for aircraft anti-icing purposes includes a valve chamber with an inlet for high temperature bleed air and an outlet for temperature modulated bleed air for aircraft systems. A modular valve mechanism is mounted in a chamber for regulating the flow of hot bleed air to the outlet in response to the temperature of the supply. The valve includes a first wall section having a plurality of spaced apart flow orifices or openings in one face and fixedly secured adjacent the inlet end of the chamber, and a second confronting wall section having a plurality of spaced apart flow orifices or openings provided to directly confront the orifices in the first wall section. The wall sections are movable relative to one another in response to the temperature of the bleed air at the inlet end so as to displace the respective sets of flow orifices in and out of registry for controlling the flow of bleed air supplied to the outlet of the valve.

Abstract: Device for distributing thermoplastic or like material introduced into a feed assembly of a die for manufacturing multi-layer sheets which is connected to at least two supplies and comprises an assembly of elements (10 to 13) juxtaposed in such manner as to define a central channel (16) and including at least one radial channel (18, 25, 29, 32) opening into said central channel (16), the device comprising, in the region of the junction of the radial channel (25, 29, 32) supplying additional material introduced on the receiving material previously introduced into the central channel (16), a progressive regulating means (50) disposed in each corresponding element (11, 12, 13) of the feed assembly so as to instantaneously modify in the plane of superimposition of the thermoplastic materials the cross-sectional shape of the corresponding stream of additional material in the central channel (16) so as to obtain the desired distribution of this material in the sheet at the outlet of the die.

Abstract: A package for dispensing a carbonated beverage pre-mix at a controlled flow rate in the micro-gravity conditions of outer space comprising a rigid outer container, a collapsible bag in the container, and an adjustable flow rate control valve. Positive pressure is applied to the collapsible container by CO.sub.2 gas in the container surrounding the bag to assist the dispensing of the pre-mix therefrom. The pre-mix is dispensed from a spout, directly into an astronaut's mouth upon actuation of a lever disposed on the top of the package.

Abstract: An apparatus for discharging dirty liquid from a vessel under pressure, comprising a valve body having a supply and discharge opening, said body accommodating a valve having a stem extending beyond said valve body and adapted for coaction with a central seat having a discharge opening. Said stem is further connected to, or integral with, the piston rod of a piston-and-cylinder assembly arranged in alignment with said stem. Said valve body, stem and seat are designed and arranged within the valve body in such a manner that the fluid to be discharged can flow from all sides radially inwardly towards the discharge opening.

Abstract: At the time of expansion and accompanying kinetic degradation of a flowing stream of fluid, the flow is stabilized by forming at least two contiguous flow streams which consist of the same fluid but have a different velocity distribution and the two streams are then mixed. When applying the method to a valve provided with a so-called "hemispherical" closure member for compressible fluids, subsonic discharge nozzles are formed by cutting recesses in the valve seat downstream of the zone in which the valve closure member bears on the valve seat in the closed position. The subsonic discharge nozzles are disposed in alternate sequence with supersonic discharge nozzles formed by the opposite surfaces of the valve closure member and of the valve seat outside the recesses. When the method is applied to a multi-bore pressure reducer for compressible gases, a pressure-reducing plate is provided with low-discharge ducts in adjacent relation to high-discharge ducts.

Abstract: A two function tank valve according to this invention includes a vertically oriented supply tube or conduit with an upper opening. A valve seat surrounds the opening, and a valve seal is movable against it and away from it. Water level responsive means determines this valve setting so the valve can be opened to fill the tank, and can be closed when the tank is full.

Abstract: A fluid-supply valve comprises a fluid inlet passage; an intermediate fluid chamber of greater volume than this passage; an fluid outlet from the chamber; and a device for closing off the inlet passage which is selectively adaptable to operate in one of two modes, namely, a first mode in which the inlet is closed off by virtue of the fluid pressure of the supply system acting against the device and a second mode in which the the inlet is opened for the passage of fluid sequentially therethrough and through the intermediate chamber and the fluid outlet by virtue of user pressure exerted via the device and against the fluid pressure. The valve may be incorporated in a public drinking fountain in which the user activated mechanism is remote from and sealed from the passages through which the fluid flows.

Abstract: A radiator valve having an enclosed pre-adjustment arrangement. In the valve body (10) a plastic insert (36) is disposed, having a coaxial, conical inner surface (38) and a projection (40) provided with a flow opening (34). The flow opening is made with a desired accuracy of size and surface smoothness. The pre-adjustment spindle (12) has a conical member (44), including a shield member (52), the height of which increases continuously. The shield member (52) is adjusted in order to cover up a larger or a smaller portion of the flow opening (34) and is locked by means of a tightening nut (62).

Abstract: An electromagnetic proportional control valve of a construction having a sleeve; a spool slidably held within the sleeve; a spring holder to move with the spool; a ball mounted in the spring holder and lifted up thereby; and a valve seat inserted under pressure into the sleeve, the ball being brought into tight contact with the valve seat by the energizing force of the spring.

Abstract: A steam control value for a steam chest such as used in a nuclear plant with an improved muffler portion. The muffler portion includes window openings of predetermined dimensions. A ring portion is below the window opening having a plurality of pockets. Each pocket is aligned with one of the window openings. This design greatly reduces vibrations which may damage the valve.

Abstract: A liquid flow regulator has a housing including an axial bore, an inlet, an outlet and a plurality of axial grooves opening endwise of the inlet and laterally of the housing into the bore. The grooves, which have different axial lengths, taper axially so that the cross-sectional area of each groove gradually decreases from the inlet to nothing at a point where the groove merges with the bore. An elastomeric stock fits within the bore. A plunger for expanding the sock radially outward into sealing engagement with the housing adjacent the bore is axially movable within the bore. Flow through the grooves and the bore is regulated by the axial position of the plunger and the minimum cross-sectional area of the tapered, axial grooves at the axial location where the sock seals the bore. Axial adjustment of the plunger sequentially opens and closes passage from the grooves through the bore to the bore outlet.

Abstract: A low-noise control valve in which a noise-dampening element (9) is arranged inside of the valve housing (1) in the passageway of the medium. A built-in element, in which lamellas touching one another are arranged over the entire cross section of passage parallel to each other and parallel to the direction of flow serves as noise-dampening element. These lamellas exhibit a linear corrugation, with the directions of the corrugations proceeding obliquely with respect to the direction of flow and the directions of the corrugations of two adjacent lamellas at a time intersecting each other. Favorable sound level reductions are achieved in small installation dimensions. In upper valves, the built-in element can be arranged at the valve cone. In rotary cone valves, it can be designed as a valve seat.

Abstract: A low-noise valve has a body with a fluid inlet to receive pressurized fluid, an oulet and a fluid passageway extending between the inlet and outlet. Located in the passageway are a number of spaced throats. The valve also includes a movable stem with a number of plugs each adapted to be closely received by a corresponding throat. Each plug includes a plurality of circumferential alternating grooves and lands, the lands being closely spaced within the throats to create a plurality of flow restrictions each incrementally restricting fluid flow when the stem is at a minimum flow position. Movement of the stem toward a full open position sequentially removes the lands from the throat to reduce restriction of said fluid flow in stages.