Abstract: A heat exchanger, especially recuperator for high temperature reactors, comprising a prismatic extending jacket and a multiplicity of elongated hexagonal elements arranged within the jacket and essentially parallel to the primary direction or extent thereof. Each hexagonal element has a central tube and heat transfer surfaces arranged about each central tube and extending axially up to the outer contour or outline of the corresponding hexagonal element. Both ends of the heat transfer surfaces are connected to collectors seated upon the central tube. Each hexagonal element is connected by spacers with its neighboring elements and with analogous spacers spatially fixedly arranged at the region of the jacket laterally bounding the heat exchanger. The spacers have play so that the spacing between the elements and between the elements and the spatially fixedly arranged spacers can alter by the amount of such play.

Abstract: The packing element is made up of a plurality of corrugated plates which are provided with a plurality of apertures as well as with a fine fluting on the walls of the corrugations. The flutings are disposed on both sides of the plates. The flutings are in the form of grooves which extend at an angle to the axis of the column which is of opposite sign to the angle of the corrugations relative to the axis of the column.

Abstract: The steam throttle valve has a number of water injection ducts distributed around the valve axis within a thin-walled hollow member which extends around the valve axis. A thin-walled water supply duct in a bore in the valve casing cover supplies water to the hollow member. The member is annular and is retained between two assembled parts of the valve, namely the cover and a valve cage. Constructing the ducts in this way obviates thermal stress cracking near them.

Abstract: The pivotable projectile feeder has a trough at one end which is shaped to the shape of the gripper shuttle. The trough has an aperture on a side remote from the transfer position to permit the weft yarn to pass freely therethrough when the feeder is returned to the transfer position after picking.

Abstract: The burner is constructed with three concentric annular spaces which terminate in a ceramic muffle and a plurality of straight passages which extend coaxially through the muffle. The innermost space surrounds a burner lance and is supplied with fresh air while the other annular spaces and passages are supplied with a flue gas/air mixture from a distribution chamber. This latter chamber is connected to a take-off line of the combustion chamber in order to receive the flue gas and various means can be used to mix fresh air into the flue gas before entry into the distribution chamber.

Abstract: The cleaning means employs a nozzle on one side of the picking mechanism which directs a stream of air over the weft yarn in a direction opposite the picking direction to pass through the picking station as well as a funnel on the opposite side of the picking mechanism to receive and exhaust the air with any entrained foreign matter from the picking station.

Abstract: The pawl is retracted from the intermittently rotatable input shaft via a controlled abutment and a spring biased lever-mounted or piston-mounted roller. The abutment serves to start retraction of the pawl while the spring biased roller presses against a non-circular surface of the cam plate on which the pawl is mounted to complete removal of the pawl from the recess. The cam plate also has one or more cam surfaces for resetting the abutment after the pawl has been engaged in the shaft.

Abstract: Xylan-containing raw material which is very absorbent in the dry state, particularly one year old plants, is treated with an acid either by spraying or by an acid vapor to a limited extent. The extent of treatment is sufficient to permit hydrolysis of the xylan to xylose without complete saturation of the raw material. After hydrolysis, the raw material is washed in counterflow with water to extract the xylose solution. Washing may be accomplished in an extraction column or in a multi-step mixing arrangement.

Abstract: The heat exchanger is constructed with a plurality of fittings which are disposed in the flow passage. Each fitting is constructed of at least two groups of webs with the webs of each group disposed in spaced parallel relation and in angular relation to the axis of the flow passage. Also, each group of webs is disposed in crossing relation to the webs of the other group. The ratio of web width (b) to diameter (d) of the flow passage is in the range of from 0.08 to 0.5 while the ratio of web spacing (m) to the diameter (d) is in the range of from 0.38 to 0.9. The fittings permit improved heat transfer with reduced pressure losses and a relatively small total area.

Abstract: The camshaft is constructed in portions each of which has an integral flange at one end and a releaseably secured discoid member at the other end. The flange of one shaft portion is secured to the discoid member of an adjacent shaft portion by means of screws. Each shaft portion has a plurality of cams shrink fitted thereon.

Abstract: The head box has a plurality of distribution pipes for delivering pulp with each distribution pipe communicating via a plurality of feed pipes with a row of flow ducts in a block having a plurality of rows of flow ducts. The feed pipes have equal flow resistance and each has a pin-shaped part at the inlet end which acts to anchor the feed pipe in place. Each pin-shaped part also carries a cam which projects into a distribution pipe to keep the inlet to the respective feed pipe free of fibers.

Abstract: The deflection beam is mounted independently of the tensioning beam to permit raising and lowering of the deflection beam when mounting a warp beam on the loom. The deflection beam is mounted on a support which is secured to a support beam via a detachable clamp connection. A pivotally mounted roller lever which rides on a cam track on the support is used for raising and lowering the support and deflection beam.

Abstract: The heat exchanger element is constructed with radially disposed walls so as to sub-divide the element into flow zones with alternating zones carrying first and second heat-exchange media. The alternating zones convey the media in opposite directions to carry out the heat exchange. The walls may be of flat shape disposed in a radial pattern or may be formed of corrugated plates interspaced between flat walls.

Abstract: The spacer grid is formed of metal strips which are bent to have alternating long angular sides and short flat sides. The strips are secured to each other at alternating flat sides to form a series of hexagonal spaces to receive the heat exchanger tubes. In addition, pairs of spring tabs are bent out of each of the angular sides in alternating manner to effect support of the tube in a space. The angular sides form an included angle of 135.degree. with the flat sides.

Abstract: A knot hole beam, for instance a warp beam for looms, for winding-up yarns or the like, comprising a winding tube or cylinder provided at its periphery with knot holes, each knot hole possessing an insertion bore serving for the insertion of a bundle of tied together or knotted yarn or thread ends and at least one, therewith merging knot arresting opening of narrower shape than the insertion bore. Between the insertion bore and the knot arresting opening there is provided at least at one side of the knot hole edges an arresting projection for the inserted knot. Such arresting projection protrudes towards a line which is axially parallel to the lengthwise axis of the tube and extends through the center of the insertion bore. The arresting projection is situated closer to such axially parallel line than an outer peripheral portion of the knot arresting opening which is situated furthest therefrom.

Abstract: The forced-flow steam generator is provided with a control means for controlling the amount of water fed to the evaporator. The control means includes a controller which receives a load-dependent signal and an actual value signal from a temperature measuring means. The steam generator includes an injection line which communicates at a point downstream of the temperature measuring means. The controller may be connected directly to a valve in the injection line in order to regulate the amount of water which is bypassed around the evaporator or may be connected directly to the feedwater supply to maintain a constant flow to the evaporator during injection of water.

Abstract: The fabric is woven with a reinforced warp strip between the background section and the selvage to allow spreading out of the fabric without using needle rollers in the background section. The reinforced warp strip may be formed with a permanent strip portion which remains with the background section and a removable reinforced strip portion which can be severed from the fabric.

Abstract: The apparatus is provided with a screening chamber filled with a radiation-screening liquid above the irradiation chamber in which a tubular radiation source carrier is mounted. The screening chamber is sealed off from the irradiation chamber while orifices are formed in the support member of the carrier to permit loading and unloading of the carrier with the radiation sources. These sources may be stored in a pit adjacent the irradiation chamber and submerged in the screening liquid.

Abstract: The scram valve has a closing piston which can be controlled by a pilot valve in a pressure medium supply line to the closing piston. The pilot valve has a control piston which is spring biased on one side and connected on the other side with the flow of medium in the outlet spigot of the scram valve. Thus, should the pressure in the outlet spigot drop, the control piston moves to open the pressure medium supply line to the closing piston. In addition, this supply line is connected at the upstream end to the scram valve casing upstream of the valve seat so that the pressure of the medium flowing through the scram valve aids in the closing of this valve.

Abstract: A vehicle traction device for rubber tired vehicular wheels, comprising a traction unit in the form of, for instance, a wire netting or chain equipped with a tightening mechanism for the traction unit and effective at least at one side of the wheel in the circumferential direction in the mounted condition of the vehicle traction device. This tightening mechanism comprises a tensioning element extending in the circumferential direction of the wheel and elastically constructed at least over a part of its extent and a tightening or tensioning wire which likewise extends in the circumferential direction. One end of the tightening wire is fastened to a body member of a tightening lock of the tightening mechanism and the other end is guided through a blocking element arranged in the tightening lock. When the vehicle traction device is mounted, the blocking element allows displacement of the tightening lock relative to the tightening wire only in the sense of shortening the effective length of the tightening wire.