Abstract: A device for regulating the flow of a fluid comprising a series of gratings positioned perpendicularly to the fluid flow, wherein it is formed by a stack of identical, contiguous gratings, whereof each is constituted by identical meshes forming a flat system, said meshes being staggered from one grating to the following contiguous grating, and wherein the mesh is formed by two adjacent equilateral triangles, one corresponding to an orifice and the other containing a crosspiece with three branches.The invention also relates to a nuclear reactor fuel assembly incorporating such a device.

Abstract: A quickly and easily assembled, fastener-free baffle system for use with agitated reaction vessels. The novel baffle system is characterized by its ability to be disassembled into easily-cleanable parts, its lack of independent fastening means such as screws, welds, rivets, etc. and the easy interchangeability of its parts.

Abstract: A concentric rod and tube sensor for a thermal mass flow controller or flow meter is disclosed. The flow meter has a flow passage therethrough for measuring the flow rate of a fluid and includes a heater for heating the fluid flowing therethrough. The flow meter senses the temperature rise of the fluid flowing through the flow path heated by the heater and then generates a signal in response to the temperature rise of the fluid with this signal being proportional to the mass flow rate of the fluid flowing through the flow path. The flow meter includes an inlet bushing having at least one opening therethrough, an outlet bushing having another opening therethrough, a tube extending between and being received by the bushings, and a rod disposed concentrically within the tube.

Abstract: A circuitous path flow restrictor (10) having no moving parts includes a fluid director member (16) having a core (24) and a plurality of fins (26) extending from the core and defining alternately axially offset notches (50,52). The fluid director member is encircled by a containment member (54) such that a serpentine fluid flow path (58) is defined therebetween to provide a fluid flow resistance level equivalent to a simple orifice of much smaller diameter. The fluid director member can be made by a precision casting process for economy of manufacture.

Abstract: A variable, self-regulating valve having a hydraulic loss coefficient proportional to a positive exponential power of the flow rate. The device includes two objects in a flow channel and structure which assures that the distance between the two objects is an increasing function of the flow rate. The range of spacing between the objects is such that the hydraulic resistance of the valve is an increasing function of the distance between the two objects so that the desired hydraulic loss coefficient as a function of flow rate is obtained without variation in the flow area.

Abstract: An apparatus and process for restricting fluid flow in a pipeline. An improved inflatable sleeve flow restricting apparatus is disclosed which in one embodiment has restrictor arms extending from one or both ends of the flow restrictor cartridge for engagement with the pipeline side wall at their other ends restricting the inflation of the inflatable sleeve thereby allowing inflation to greater inflation fluid pressures providing pipeline fluid flow restriction in pipelines having pressures of up to about 125 psig. A combination boring-insertion tool is described which utilizes fluid pressure to provide force for the hole cutter.

Abstract: A fluid coupling includes inlet and outlet segments, each having a fluid carrying aperture with a major diameter fluid port at one end and a minor diameter coupling port at the other end of the segment longitudinal axis, the fluid ports being adapted for fluid communication with an associated fluid source and the coupling ports being adapted to receive each other in registration with engagement of the coupling ports by end to end abutment of the segments, the fluid apertures of the abutting segments, in tandem, forming a Venturi with the throat defined by the abutting coupling ports at the coupling interface, the coupling port minor diameter value being selected relative to the fluid port major diameter to provide a fluid pressure value at the coupling interface which is not greater than the outside ambient pressure, thereby preventing fluid escape to the ambient environment across the coupling interface.

Abstract: A cryogenic lead is described which comprises a plurality of tubular conductors arranged in parallel association and connected to two conductive blocks. Each tubular conductor is a laminar assembly of an inner conductive sleeve and an outer sleeve which acts as a thermal mass to absorb heat from the inner sleeve during thermal perturbations. A fluid refrigerant is directed through the tubular conductors. Each tubular conductor has at least one flow restrictor disposed within its inner sleeve to reduce the relative effect of changes of refrigerant viscosity on pressure drop within the tubular conductor and to block the transmission of thermal radiation through the tubular conductor.

Abstract: Methods and apparatus are provided for attenuating through-fault pressure disturbances in fault relays for a liquid-filled transformer. The method comprises the interposition of a mechanical filter between the transformer and the relay for attenuating through fault pressure variations while passing internal pressure faults. The filter consists of a pressure attenuation passage having an optimum length to diameter ratio for attenuating higher frequency pressure oscillations in excess of 50 Hz.

Abstract: A laminar flow element for mounting inside a fluid flow channel, which flow element is built up from flat disks which are provided with grooves running between an eccentrically made inlet opening and an outlet opening. The outer disks of a package do not have grooves and only comprise an inlet opening or an outlet opening. The inlet openings together form an inlet channel and the outlet openings together form an outlet channel. The dimensions of the grooves are such that the fluid flows laminar to the channels, formed by said grooves, between the inlet channel and the outlet channel.

Abstract: An improved drain hole is provided for a pneumatic line of a gas turbine engine. The improvement is essentially comprised of an enlargement that prevents liquid surface tension at the drain hole outer opening from inducing buildup of liquid inside the pneumatic line.

Abstract: A fuel tank-filler neck is provided for avoiding the return of fuel from a fuel tank during the filling process. The fuel tank-filler neck is adapted to be disposed sloping upwards from the fuel tank at an oblique angle and comprises a filler pipe having an air vent in a lower portion of the filler pipe adapted to the disposed within the fuel tank; a mouth at the upper end of said filler pipe adapted to receive a fuel pump nozzle; a Venturi-type neck of reduced diameter extending the aforesaid lower portion of the filler pipe below the air vent; and an air vent pipe extending within the filler pipe from the mouth to the air vent.

Abstract: Apparatus for preventing the diversion of plutonium in nuclear fuel reprocessing plants. The apparatus includes various piping arrangements which prevent plutonium in a liquid state from being drawn out of a nuclear fuel reprocessing cell through conduits which are normally accessible to the operators of the facility.

Abstract: A flow control device which will limit the maximum flow rate of liquid through a length of flexible tubing such as utilized in a parenteral administration set so as to prevent a runaway condition. A base and a cover member are provided which are hingedly attached to each other and have a groove for the placement of the tubing therein. The groove or grooves are of a dimension such that when the tubing is seated therein and the cover and base members brought together, the tubing is prevented from expanding beyond a predetermined dimension. Frictional engaging means are provided on the base and the cover member so as to provide a temporary closing of the cover and base members over the tubing.

Abstract: An adjustable orifice in the steam supply line to a gelatinizer has a pair of facing flanges. An orifice plate between the flanges is adjusted with the orifice offset to the bore through the flanges so that the proper amount of steam is supplied to the gelatinizer. After proper adjustment, the plate is clamped in place and all portions of the plate extending beyond the flanges are cut off to prevent the flow rate from being changed by unauthorized personnel.

Abstract: Orifices which are removably attached to individual tubes of a steam generator.

Abstract: A refrigeration system for use in air conditioner for automobiles. The refrigeration system has a pressure reducing device disposed between a condenser and an evaporator and adapted for permitting the refrigerant to make an adiabatic expansion therethrough. The pressure reducing device includes a flow restricting and resisting means such as an orifice and a flow resisting means disposed at the upstream side of the flow restricting and resisting means. The flow resisting means are adapted to impart a resistance to the flow of refrigerant and may be constituted by a capillary tube or a constant-pressure-differential valve. Because of the resistance imparted by the flow resisting means, the dryness factor of the refrigerant at the inlet to the flow restricting and resisting means is maintained between 0 and 0.1, so that the flow rate of the refrigerant is largely affected by the characteristic of the flow restricting and resisting means.

Abstract: An air jet cleaning apparatus for use with throttling devices mounted in ventilation ducts in which the throttling device includes a body having opposite air inlet and outlet sides and a plurality of fine through passages for conveying air flowing from the inlet to the outlet sides thereof. The apparatus includes a deflector shield mounted adjacent the inlet side of the body to allow for relative movement between the deflector and the body. The shield has an opening facing the inlet side of the body which is caused to sweep over the inlet side during relative movement between the shield and body. A duct provides communication between the shield and the outlet side of the throttling device whereby the drop of pressure across the throttling device diverts a partial air flow through the shield in another direction than the main air flow into the body of the throttling device in order to clean the surface of the inlet side of the body.

Abstract: A fluid resistor with a fluid tight structure including two planar members having a surface of each contacting in close proximity. One of the planar members has a laminated structure including a substrate and at least one thin layer of substantially uniform thickness formed on the substrate. A groove extends through the layer. The groove and the surface of the other planar member define a capilliary passageway of substantially constant depth for restricted fluid flow.

Abstract: A beverage dispensing tap of the type wherein a compensator sleeve inside the housing maintains a shut-off valve open for supply of the beverage into the housing of the tap. The invention simplifies the structure of the tap by replacing a number of sealing rings at the inlet of the housing by a single gasket which seals the compensator sleeve against the housing, provides valve seat for the shut-off valve and also serves as a seal at a union connecting the inlet of the housing to a connection pipe for feeding the beverage into the housing.

Abstract: An apparatus with a unique venturi construction and restriction structure, a liquid intake conduit and mixing chamber is provided for mixing virtually any liquid with any gas, and is particularly designed for efficient aeration of water, such as for use with aquariums and home aquaculture systems. The relative placement of different portions of the apparatus and relative sizes of the component parts are found to be a factor in improving efficiency. One embodiment, combining the unique restriction structure with a rough-edged ring inside the apparatus, is designed for excellent operation efficiency at liquid circulation pressures previously thought to be too low for incorporation of an aerating or intermixing device. The need for an additional intermixing pump is thereby eliminated and a high percentage of gas is dissolved in the liquid, compared to other similar use devices.

Abstract: An intravenous needle assembly and an associated manufacturing method, wherein the needle assembly comprises a hypodermic needle attached to a hub at its trailing end, a transparent blood detection chamber integral with the hub, a catheter disposed around the needle and the needle hub and a plug closing the blood detection chamber, the plug having air breathing capacity so that upon venipuncture blood from a vein may flow through the needle into the blood detection chamber without substantial air resistance to such flow to visually confirm the accuracy of the introduction of the needle into a vein. The plug is centrally hollow and has an axially directed leading projection connected to an annular shoulder or flange. The projection comprises a symmetrical hollow truncated conical extension with a hollow interior and walls having pairs of longitudinally directed ribs insuring ready passage of air from the flashback chamber along the outside of the projection under pressure of the heart.

Abstract: A flow control device having a resilient, disc-shaped flow control element mounted in a protective housing assembly. An inlet housing section sealingly engages with an outlet section to form a cavity in which are received a retaining washer and a cup-shaped member. The flow control element is mounted in the cup-shaped member and retained therein against axial movement by the retaining washer. An inner wall portion on the retaining washer and cup-shaped member prevent fluid conduit connections inserted into either the inlet or outlet housing sections from contacting the flow control member.

Abstract: A small orifice in a flush valve piston is provided with a filter means to prevent sedimentary deposits from clogging the orifice. The filter is formed by providing a generally three-sided channel around the piston. The channel is located such that the orifice opens into the base of the channel. A resilient sealing ring is seated on the channel to close the open side of the channel. A plurality of grooves extend from the interior of the channel, under the sealing ring and to the exterior of the piston. These grooves are sized to prevent entry of sedimentary deposits into the channel while permitting entry of water in the channel. The grooves are individually small compared to the orifice opening but they are sufficient in number to provide an adequate supply of water to the orifice.

Abstract: In the removal of particles from a gas stream by high intensity ionization and then collection by electrostatic precipitation, flow of the electrostatically charged gas entering the precipitation is restricted in a non-uniform manner.

Abstract: A calibrated oxygen metering orifice for a portable oxygen supply kit is made by first forming a cylindrical hole in a valve body, then progressively pressing into the hole a plug of conforming cross section having in its surface a scored slot of progressively decreasing cross-sectional area which defines with the wall of the hole an orifice of a size depending on the depth to which the plug is inserted in the hole, monitoring the gas flow rate through such orifice as the plug is pressed into the hole, and stopping the plug at a position which gives the desired calibrated gas flow rate.

Abstract: Flow restricting devices are provided for individual tubes connected into bores in a tube bank and are each formed with a convoluted passage of restricted cross-sectional area and extended length to produce a required flow restriction.

Abstract: A static limiter of the flow rate through a hydraulic circuit generates a pocket having a high degree of cavitation at a predetermined flow rate. The static limiter constitutes a streamlined, oval body coaxially mounted within a circular cylinder with obstacles fixedly disposed between the streamlined body and the cylinder whose diameter is greater than that of the body. Under certain conditions it can operate as a non-return valve.

Abstract: A multilayer vessel or tube comprises an inner core tube and a plurality of supporting layer tubes around said inner core tube which have degassing bores. A blind layer is provided between the core tube and the innermost supporting layer tube and a plurality of core plugs rest on the core tube and are provided in a number corresponding to the number of degassing bores. The blind layer has an opening therethrough and is longitundinally split into segments and a parting channel is formed between every adjacent two segments. A core plug is positioned in central alignment with the parting channel in an opening of the blind layer. One of the supporting layers is welded only by its upper portion to the supporting layer and the core plug has a bore communicating directly or indirectly with the atmosphere. A degassing pipe is threaded into a threaded bore defined in the core plug and the core plug is provided with grooves which extend transversely along its underside, which rests on the core tube.

Abstract: A pressure accumulator for a hydraulic system includes a rigid container whose cavity contains a partition of pliable, resilient material which seals one compartment adjacent the bottom wall of the container from another compartment containing a gas under a pressure sufficient for expanding the partition into abutting engagement with the bottom wall when the fluid pressure in the one compartment equals atmospheric pressure. A passage outward from the one compartment through the bottom wall is shielded against insertion therein of any portion of the partition, and the resulting risk of injury to the partition, by a shielding member projecting from the bottom wall into the one compartment and having a frontal surface directed toward the other compartment. Its annular rim portion has a surface contiguously adjacent an annular portion of the bottom wall, and the two annular surface portions and the partition bound therebetween an annular space at atmospheric pressure in the one compartment.

Abstract: There is disclosed an adjustable fluid flow restrictor for controlling the rate of fluid flow into a conduit, the restrictor having a body which seals the central opening of a fluid chamber and through which body there is a central opening having a cylinder section and a truncated cone section the cylinder section having a set-screw engaged therein, the threads thereof forming spiral grooves through which fluid maybe conducted at a rate controlled by positioning the end of the set-screw adjacent the walls of the truncated cone section to obstruct and adjustably close the openings into the spiral grooves thereby restricting the rate of fluid flow. An alternate form of the restrictor employs a ball-valve between the set-screw and the truncated cone section, the space between the ball-valve and the walls of the truncated cone section being adjusted by the set-screw to restrict the flow of fluid.

Abstract: Improved method and apparatus for distributing a fluid, e.g., a liquid-vapor mixture, through a conduit, e.g., a tube in a direct fired heater, involving at least one reduction means located inside the conduit to abruptly reduce the inside cross-sectional area of the conduit available for flow of the fluid, provided that the inside cross-sectional area of the conduit is substantially the same both before and after the reduction means.

Abstract: An intravenous needle assembly and an associated manufacturing method, wherein the needle assembly comprises a hypodermic needle attached to a hub at its trailing end, a transparent blood detection chamber integral with the hub, a catheter disposed around the needle and the needle hub and a plug closing the blood detection chamber, the plug having air breathing means so that upon venipuncture blood from a vein may flow through the needle into the blood detection chamber without substantial air resistance to such flow to visually confirm the accuracy of the introduction of the needle into a vein. The plug is centrally hollow and has an axially directed leading breather projection connected to an annular shoulder or flange. The breather projection comprises a symmetrical hollow truncated conical extension with a hollow interior and walls having a plurality of narrow slits permitting ready passage of air under pressure of the heart while substantially preventing the passage of blood through the slits.

Abstract: A heat pipe element comprising an outer pipe member and an inner tubular member incorporated in the inner circumference of the outer pipe member with a capillary space defined between the two members, which inner tubular member is formed by winding in a spiral shape from a web of sheet material with a narrow continuous space between the adjacent surfaces of thus-shaped inner member so that a capillary action may occur in the narrow space. A multiplicity of fine recesses extending longitudinally of the inner and/or outer members may be formed in the inner and/or outer circumference of the inner member and/or in the inner circumference of the outer member.

Abstract: Fluid pressure reducing apparatus adapted for positioned placement in a fluid valve or conduit in which pressure reduction is to be effected. A disc, sleeve or other body member in the flow path defines a plurality of line-of-sight grooves of non-circular cross-section between an inlet and an outlet communicating with the upstream and downstream portions, respectively, of the valve or conduit in which it is placed. Contained positioned transverse within each of the grooves are a plurality of longitudinally spaced circular crests formed of screw threads, parallel thin discs or the like. The crests in this arrangement cooperate with the groove walls to define a single stage pressure reducer in a fluid flow path from inlet to outlet through the longitudinal open spacing therebetween.

Abstract: A vacuum union having a tubular body adapted for transmitting a vacuum signal from an intake pipe of an internal combustion engine of a vehicle to a vacuum-operated brake booster of a vehicle brake device, and a branch pipe adapted for transmitting a vacuum signal from the tubular body to other vacuum-operated engine controlling devices. An orifice for restricting the level of the vacuum signal, to be transmitted to the brake booster, is located downstream of a branch pipe with respect to the intake pipe. Therefore, a drop in the vacuum level is effectively decreased for maintaining the proper operation of the brake device, even if the controlling devices are damaged, thereby causing the branch pipe to be opened to the atmosphere.

Abstract: Heat pipes containing graded pore non-arterial wicks have substantially improved reliability when compared with those which utilize arteries. Heat pipes having wicks which are optimally graded in pore size in an axial direction, with the pore size decreasing from the condenser to the evaporator end. These graded pore size wicks yield more than twice the capacity of axially uniform pore size wicks having similar geometries.

Abstract: Cold is generated, according to the invention, by compressing a refrigerant and expanding the refrigerant isentropically in a nozzle. Advantageously at least a part of the expanded refrigerant is passed in indirect heat exchanging relationship with the portion of the refrigerant prior to expansion. An expansion machine can be used to work-expand a portion of the compressed refrigerant with the expanded gas returned to the compressor. The balance of the compressed stream is expanded in the nozzle.

Abstract: The present invention provides a restrictor for use in a refrigeration system including the method of adapting its use to the system and more particularly to a restrictor that is formed by providing a flattened portion of tubing that is bent to establish a substantially U-shaped restrictor having diverging leg members connected at their apex by an arcuate segment. Means are provided for moving at least one of the leg members relative to the other so that the diameter of the arcuate segment is altered. Altering the diameter of the arcuate segment causes the cross-sectional area of the restrictor passageway in the segment area to change and, accordingly, the refrigerant flow through the restrictor is effectively adjusted to optimize the refrigeration system efficiency.

Abstract: The fluid coupling apparatus is disclosed which is adapted for connecting and disconnecting a first and a second fluid carrying member. Male and female coupling members are connected to the first and second fluid carrying members respectively. The female coupling member comprises a female internal orifice having a female radially enlarged portion in the female internal orifice of the female coupling member. The male coupling member frictionally and sealingly engages portions of the female coupling member for temporarily securing the male coupling member to the female coupling member. Flexible means is established in at least a portion of the male coupling member for radially expanding into the female radially enlarged portion upon application of fluid pressure to connect the male coupling member to the female coupling member.

Abstract: Apparatus for heat transfer is disclosed. This apparatus is a closed container which is possessed of an input portion and an output portion for heat energy and is provided on the inside thereof with a wick extending throughout from the input portion to the output portion and disposed so that the resistance offered thereby to the flow of liquid gradually decreases from the input side to the output side. The heat medium which is vaporized on the input side is moved in the direction of the output side by virtue of the difference of pressure created inside the container. The heat medium which is deprived of heat and consequently liquefied on the output side is moved within the wick in the direction of the input side by virtue of capillary action coupled with the suction resulting from the vaporization of the heat medium in the input portion.

Abstract: Heat pipes comprising an outer tubular material closed at both ends, a wick of metal fibers, an inner tubular material covered with the wick and inserted in the outer tubular material and a heat transfer volatile liquid confined in the closed outer tubular material. An evaporation region and a condensing region are respectively constituted in the end portions of the outer tubular material. The liquid in the evaporation region vaporizes when heated and the vapor is passed to the condensing region to condense while giving the heat of the vapor to other materials outside the heat pipe, and the condensed liquid is returned to the evaporation region by the capillary action of said wick, thus repeating a cycle of the evaporation and condensation.

Abstract: Described herein are fluid flow control valve trims suitable for use in a valve in which high fluid pressure drops are to be sustained without excessive noise generation or cavitation damage to valve members. The valve trim is constructed of two or more annular cages surrounding a central passageway, each outer cage circumferentially engaging the next inner cage. A valve stem carrying a valve plug member is axially movable within the central passageway, the plug member slidingly engaging the radially inward surface of the innermost annular cage. Communicating through the walls of each of the cages are flow-restricting orifices and fluid pressure recovery chambers defining two or more sequential orificial throttling stages. By the use of concentric annular cages a valve trim structure is achieved in which the flow-restricting orifices and pressure recovery chambers may readily be formed having reproducible, predetermined sizes and shapes by conventional machining operations.

Abstract: A control device regulating flow rate of a two-phase mixture of steam and water through a vent conduit in fluid communication with the exit from the fourth pass of a four-pass heat exchanger and a low pressure source. The heat exchanger conducts a first fluid vapor through the first and second tube side passes while condensing a portion of the first fluid vapor therein and separating the resulting mixture into condensate and vapor portions at the exit of the second pass. The separated first fluid vapor is then routed through the third and fourth passes where additional condensation of first fluid vapor takes place. A high ratio of first fluid vapor to first fluid condensate is maintained in all four passes to prevent tube failure due to cyclic tube temperatures resulting from alternate flooding and draining of the tubes' interior. The first fluid exiting from the fourth pass is a two-phase mixture of vapor and condensate which must both be vented to a lower pressure source.

Abstract: A more compact high energy loss device is provided having a series of uniquely formed multiturn labyrinth assemblies which reduce the pressure of a fluid flowing therethrough. The inlet of the labyrinth assemblies is formed according to a substantially circular configuration to have a predetermined inlet area while the outlet is formed according to a substantially scalloped configuration to provide an outlet area greater than the inlet area. The scalloped configuration of the outlet yields an outlet area which is also greater than if the outlet were of circular configuration. The scalloped outlet configuration also makes the labyrinth assembly less susceptible to circumferential thermal stresses resulting from high temperature fluids passing through the device producing high temperature inlet conditions and low temperature outlet conditions.

Abstract: A noise suppressor for reducing noise resulting from venting of large volumes of high pressure gas. A first pipe member has an open first end, adapted for attachment to a high pressure gas outlet, and a closed second end. A plurality of second pipe members are attached to the first pipe member sidewall and communicate through openings in that sidewall with the interior of the first pipe member. Within the second pipe members a number of plates are positioned, each having several parallel elongated slots therethrough. The plates within each second pipe member are slanted, with the direction of slant alternating between consecutive plates. Preferably, the consecutive plates are rotated 90.degree. and the elongated slots are slanted with respect to the plate surfaces. A further plate member is provided normal to the second pipe member longitudinal axis. The noise suppressor can be coupled to the high pressure gas outlet by valves or directly.

Abstract: A pressure tap having utility in an environment of a solid-gas phase process flow includes a tubular coupling part having attached over a passage therethrough at an end opening thereof exposed to the flow a grating of spaced bars, and affixed internally across a passage therethrough so as to cover over an opening therein a screen which maintains contained within the passage between it and the grating a matrix of smooth spheres. The grating bars are so oriented by the disposition of the aforesaid end opening with respect to the flow such that accumulations of solids therebetween tending to bridge the opening are removed therefrom by the flow.

Abstract: A flow restrictor is made by flattening a tube of flexible material about a member of cross-sectional characteristics representative of a desired flow passage, and securing the tube there, e.g. by rf welding. The member is then removed leaving a determinate flow passage in which problems of creep do not arise. The restrictor may have parallel to the flow passage a portion of the tube which is not permanently secured together so as to leave a by-pass which can be open to give a comparatively unrestricted flow passage or can be temporarily completely closed by external compression. A single tube may have in line a plurality of such restrictors with by-passes, the flow passages of the various restrictors being of different flow characteristics. The flow characteristic required is obtained by closing off the by-pass associated with the selected flow passage.

Abstract: An orificial restrictor for use in a ballasting system for an underwater icle utilizing a plurality of multi-holed orifice plates set in series within a casing. A hollow cylinder is slidably positioned within the casing and carries fluid supplied through an inlet in the case. A spring biases the cylinder toward the inlet and fluid pressures opposes the spring force to move the cylinder away from the inlet whereby the hollow cylinder automatically positions itself with pressure changes to control the number of orifice plates subject to flow.

Abstract: Cylindrical body the outer periphery of which is provided with means to counteract vibrations occurring in that body as a result from transverse flow against it, these means comprising a number of small planes mounted according to a certain pattern and placed substantially perpendicular to the outer periphery of the body, which planes form an angle of from 5.degree. to 25.degree. with the cross-section of this cylindrical body; the surfaces of these planes at the most amounting to 2.5% of the surface of the cross-section of the cylindrical body and their lengths at most to 20% of the diameter of this body.