Abstract: The invention contemplates a powder-feeding system for gas-propelled delivery of a powder to be controllably supplied, as to a flame-spraying gas torch or to a transferred-arc plasma torch. A fluidizing chamber receives (a) fluidizing-gas flow from below a porous screen, and (b) a restricted gravitational flow of powder at a relatively small central discharge location above the porous screen. A gas conduit extends transversely through the chamber between the powder-discharge location and the porous screen; it has a carrier-gas supply connection at one end and a gas-propelled powder-delivery connection at its other end. The conduit also has an upwardly extending opening virtually beneath and facing the powder-discharge location, but a shed interposed between this opening and the powder-discharge location sufficiently overlaps the opening to assure that no powder will pass through the opening and into the conduit unless it has been gas-fluidized.

Abstract: A method of, and apparatus for, maintaining substantially constant a quantity of opened fibrous material delivered per unit of time, to a spinning preparatory machine, wherein a conveying air stream is generated by means of a fan operating at a given point on its characteristic diagram, the conveying air stream is delivered into a transporting duct for the fibrous material, and the fibrous material is supplied into the transporting duct. The supplied fibrous material within the duct is accelerated by means of the conveying air stream, and the accelerated fibrous material is delivered within the duct in the direction of the spinning preparatory machine.

Abstract: The present invention is for a continuous system wherein spent catalyst is removed from a regeneration vessel, while fresh catalyst is added in order to maintain proper catalyst activity in a hydrocarbon processive system. The withdrawal of the spent catalyst must be achieved at a steady flow rate which is compatible with the introduction of fresh catalyst of the hydrocarbon processing system. This flow rate is controlled by a downstream pressure and venting control in the spent catalyst hopper stage acting in conjunction with a novel flow restriction zone in a discharge conduit.

Abstract: Method and apparatus for controlling sucking of a material suspendible in air or liquid by means of a suction nozzle connected to a pump through a conduit and having a flow rate or solids concentration sensor connected to said conduit, the suction nozzle being supported via a supporting wire rope or like flexible support by a hoisting device which is carried by a device for moving the hoisting device and the nozzle along at least one horizontal axis at adjustable velocity, while the nozzle is vertically adjustably carried by the hoisting device, wherein the hoisting device for vertically adjusting the nozzle is controlled with a control device by signals from the flow rate or solids concentration sensor in such a way that said flow rate or solids concentration sensor is preset to supply a control signal to the hoisting device for raising or lowering the nozzle to thereby restore the flow rate or solids concentration quantity per unit time in the conduit when the flow rate or solids concentration quantity per

Abstract: A control system for an apparatus for hydraulically transporting sedimentation prone slurry containing pulverized or powdered solid material mixed with water. A pipeline resistance of a slurry transport pipe at a proper location is detected by varying the flow rate of the slurry at the starting point of slurry transportation, and the critical flow velocity for slurry sedimentation is determined by using the pipeline resistance. The slurry is economically transported at the flow velocity above the critical flow velocity.

Abstract: A pneumatic conveying apparatus for reloading bulk materials, comprising a suction line formed by a vacuum pump connected to a settling chamber, and to an intaking nozzle, a discharge mechanism connected to the settling chamber, an electrically driven nozzle-transfer mechanism, and an electric drive controlling device. The electric drive controlling device constitutes a vacuum sensitive element connected into the suction line, while the electric drive of the nozzle-transfer mechanism being of a variable type, is supplied with a master switch, having its input mechanically linked to the output of the vacuum sensitive element.

Abstract: An automatic feed control system for a forage blower of the type adapted to be fed by a forage unloading wagon including a pressure switch connected to the blower discharge pipe, a device for controlling the discharge rate of the wagon to the blower, and electrical circuitry connecting the switch and control device so that when pressure in the discharge pipe exceeds a given level, the pressure switch actuates the control device to reduce the feed rate of the crops to the blower from the wagon.