Abstract: To supply a powder lacquer sprayer, the coating powder is pressed by a pig through the supply line and, in the process, it is fluidized from the side of the pig which is turned toward the powder. The fluidization air can be led to the powder, for example, by a central passage opening of the pig or through an air permeable wall of the connection line. For the dosage of the coating powder, one uses the push medium which drives the pig.

Abstract: A vacuum modulating air control valve includes a valve body with air intake ports, an output port, and a valve throat. A valve member is slidably mounted within the valve body between open positions relative to the valve throat and a closed position, to which the valve member is urged by a valve spring. A pneumatic cylinder has a piston forming a vacuum chamber and has a piston rod connected to the valve member. The output port is connected to a feedpoint of a vacuum conveying system, and the vacuum chamber is connected to a vacuum line communicating with the vacuum conveying system. A vacuum level within the vacuum chamber retracts the valve member from the throat, thereby admitting ambient air into the vacuum conveying system to control a material-to-air ratio within the system.

Abstract: An apparatus for applying a shredded foil radiant barrier on top of existing attic insulation. The foil is spun in an air vortex created in a tank, and is blown from there via a hose/applicator to a remote attic. A conical component in the tank helps to establish and maintain the vortex, and to minimize leaving shredded foil in the bottom of the tank.

Abstract: A method and apparatus for conveying and vacuuming fibrous insulation material. A blower provides an air flow stream through an insulation feeder and a conveying hose for application of the insulation. The air flow stream velocity is selectively controlled responsive to a velocity sensor and/or a pressure sensor between the blower and insulation feeder. Preferably, an air valve connected between the blower outlet and the atmosphere is controlled responsive to the velocity sensor for thereby adjusting and controlling the air flow stream velocity. The insulation feed rate is controlled in response to the air flow pressure between the blower and feeder. An air separator and vacuum hose are selectively connected to the blower inlet such that the blower provides both an air vacuum flow stream through the separator and vacuum hose and a conveying air flow stream through the insulation feeder and conveying hose.

Abstract: A powdery particle conveying system is provided in which electric power consumption can be saved when powdery particles are conveyed by use of a roots blower. In the case where the powdery particles are conveyed to a reservoir tank near the roots blower, the frequency of a power source of a roots blower driving motor is reduced, thereby reducing an output of the roots blower. In contrast, in the case where the powdery particles are conveyed to a remote reservoir tank, a voltage of a commercial frequency is applied to the motor.

Abstract: A system and method providing automatic adjustment of flows used to empty dry material from a pressure pot or hopper. In some embodiments, based on pressure increases in the conveying line that receives the dry material, the flow of conveying-fluid to the conveying line automatically increases and/or the flow of pressurization fluid to the hopper that assists pushing dry material out of the hopper automatically decreases and/or rotary-valve speed controlling dry-material rates from the hopper automatically slows. In some embodiments, one or more discretely or continuously adjustable critical-flow venturies (CFVs) automatically adjust mass flow of fluid based on, e.g., pintle position set by a pneumatic cylinder controlled by conveying-line pressure. Each pintle moves in and out of its CFV throat, adjusting throat area, thus setting the rate of flow. In some embodiments, pintle cross-sectional area is linearly proportional to distance from the tip of the pintle.

Abstract: An apparatus for transporting solid waste drill cuttings material produced in the drilling of an oil or gas well, the apparatus including: a waste supply apparatus; a feeder to transport the material; a pneumatic conveying apparatus to which the material is transferred from the feeder; at least one blockage sensing device in the conveyor; and a control apparatus for controlling feed rate of the feeder.

Abstract: A method and apparatus for conveying and vacuuming fibrous insulation material. A blower provides an air flow stream through an insulation feeder and a conveying hose for application of the insulation. The air flow stream velocity is selectively controlled responsive to a velocity sensor and/or a pressure sensor between the blower and insulation feeder. Preferably, an air valve connected between the blower outlet and the atmosphere is controlled responsive to the velocity sensor for thereby adjusting and controlling the air flow stream velocity. The insulation feed rate is controlled in response to the air flow pressure between the blower and feeder. An air separator and vacuum hose are selectively connected to the blower inlet such that the blower provides both an air vacuum flow stream through the separator and vacuum hose and a conveying air flow stream through the insulation feeder and conveying hose.

Abstract: A control mechanism (20; 70) and a method for use in an installation for transporting bulk material, granular material or powdery material through a conveyor line (1) with the aid of a pressurized gaseous medium. The control mechanism (20; 70) is arranged for being connected to the conveyor line (1) for the purpose of introducing a pressurized gaseous medium (15) therein and comprises a connecting opening (24) for connecting the control mechanism (20; 70) to an inlet (25) in the conveyor line (1), an intake (26) for gaseous medium (15), which is in communication with the connecting opening (24), valve means (28; 71), which operatively engage the intake (26), and means (31, 32, 35, 50, 51; 32) for controlling the valve means (28; 71) associated with the pressure of the gaseous medium in the conveyor line (1).

Abstract: In a method of dynamic transporting of with a flow of object a carrying medium, action are applied to the carrying medium which are created in an action element during a process of conversion of an energy supplied to it, so that the flow of a carrying medium created thereby acts on the object for preforming a process of it transporting in a given direction, and a modulation of a value of the action is performed in the action element so that the flow of the carrying medium which is dynamically created moves with a given dynamic periodically changing sign-alternating acceleration during the process of transporting of the object.

Abstract: A reservoir for powdery media, in particular powder coating, comprises a housing having at least one inlet and at least one outlet for the powdery medium. A fluidising floor of porous, air-permeable material is located in the interior of the housing at a distance from its base. A pressure chamber which is chargeable with compressed air is located between the fluidising floor and the base of the housing. The outlet has the shape of an upwardly open funnel which is located in the lower partial zone of the housing adjacent to the fluidising floor. In this way well-mixed powdery medium the grain-size distribution of which corresponds to the maximum extent to that of the fluidised powdery medium inside the reservoir is always withdrawn.

Abstract: A powdery particle conveying system is provided in which electric power consumption can be saved when powdery particles are conveyed by use of a roots blower. In the case where the powdery particles are conveyed to a reservoir tank near the roots blower, the frequency of a power source of a roots blower driving motor is reduced, thereby reducing an output of the roots blower. In contrast, in the case where the powdery particles are conveyed to a remote reservoir tank, a voltage of a commercial frequency is applied to the motor.

Abstract: An apparatus for conveying bulk material in which a variable amount of a conveying gas may be introduced to the bulk material to be conveyed by a negative pressure of a vacuum conveying system. In a conveying line (4) for the bulk material being transported by the vacuum conveying system while adding the conveying gas, the negative pressure is measured by a pressure sensor (7), and a corresponding control signal is output. In a conveying gas inlet (3) of the vacuum conveying system, a valve (9) is installed whose opening for the flowing conveying gas is controlled by a controller (8) as a function of the magnitude of the negative pressure within the conveying line (4).

Abstract: The method according to the invention is suitable for determining a powder quantity in a container and for determining a change in powder quantity, i.e. the powder quantity that is supplied from the container(s). The powder is fluidized in the container, the pressure of the fluidized powder in the container is measured to determine the pressure of the fluidized powder or the change of the pressure between two measurements, wherein the powder quantity in the container, or which was supplied from the container between two measurements is calculated from the pressure or the change in pressure. By the method according to the invention it is possible by a simple pressure measurement to determine the powder quantity which is supplied per time unit from the container and which is sprayed by the coating apparatus, and therefore to determine the supplied powder mass flow.

Abstract: The present invention provides a method and plant for the pneumatic transportation of solid particles in the form of a diluted phase through a conduit (1), with which the transport air in said conduit is given a velocity which is at most equal to the air velocity chosen for a maximum particle load level. The free flow from the pressurized air source (3) is regulated on the basis of measured air velocity or on the basis of a state corresponding thereto, such as air pressure in the conduit, and an established relationship between the free flow and the said measured velocity of the air or a state (pressure) corresponding thereto, essentially independently of the particle load. There is thus maintained in the conduit a preferably constant transport air velocity with all different occurring levels of particle load.

Abstract: Process for conveyance of a powder material in a hyperdense bed to bypass an obstacle, in which an obstacle bypass device including at least upstream, intermediate and downstream caissons is inserted between two horizontal conveyors, an upstream conveyor, and the downstream conveyor. At a device entry, at the upstream caisson lower duct is supplied with gas at pressure P1, the upstream caisson further including an upper duct which is a column. The intermediate caisson is between the upstream caisson and the downstream caisson at a level that bypasses the obstacle, a lower duct of which is fed with gas at pressure P3 and an upper duct of which is connected to the upper duct of the upstream caisson and to an upper duct of the downstream caisson. At a device outlet, at the downstream caisson, a lower duct is supplied with gas at pressure P2. The three caissons remain full of powder material kept in a potential fluidization state at all times, with a pressure difference P1−P2 being kept strictly positive.

Abstract: An apparatus for conveying bulk material in which a variable amount of a conveying gas may be introduced to the bulk material to be conveyed by a negative pressure of a vacuum conveying system. In a conveying line (4) for the bulk material being transported by the vacuum conveying system while adding the conveying gas, the negative pressure is measured by a pressure sensor (7), and a corresponding control signal is output. In a conveying gas inlet (3) of the vacuum conveying system, a valve (9) is installed whose opening for the flowing conveying gas is controlled by a controller (8) as a function of the magnitude of the negative pressure within the conveying line (4).

Abstract: A method and device for pneumatically transporting bulk material including a plurality of supply elements spaced along a conveyor line. These elements provide an additional gaseous medium as a booster fluid. The supply elements are automatically and individually controlled via velocity measurements taken near the elements.

Abstract: Process for conveyance of a powder material (12) in a potential fluidization hyperdense bed using a device comprising at least one air pipe (3) comprising a lower duct (5) for circulation of a fluidization gas (G), an upper duct (7) for circulation of the powder material (12), the two ducts being separated by a porous wall (6), at least one pipe (8) supplying gas (G) and a balancing column (4, 4.2) in which the filling height (h) balances the potential fluidization pressure (pf), characterized in that a bubble (B1, B2) of pressurized gas is created in the upper duct (7) in the air pipe (3). This bubble is reliably located in the upper part (14) of the upper duct (7) of the said air pipe (3). Device to implement this process and to regulate the pressure of the gas bubble.

Abstract: In a method of operating a pulse flow conveying installation (10), which is intended for the conveying of a solid material (33), present in the form of bulk material, by means of a conveying gas, in which pulse flow conveying installation (10) an alternating sequence of solid material pulses (27) and conveying gas pulses (28) is generated by first means (13, . . . , 21) in the conveying conduit (25) and is pressed through the conveying conduit (25), choking is reliably prevented in that the conveying pressure is regulated, and in that to regulate the conveying pressure in the conveying conduit (25), the quantity of the conveying gas flowing on a time average basis through the conveying conduit (25) is altered in relation to the quantity of the solid material conveyed on a time average basis through the conveying conduit (25).

Abstract: Disclosed is a device and method to increase density of slurry transported by slurry pumping systems. A connection is made to the existing slurry pipeline so that a portion of slurry is drawn into the device. Multiple settling chambers are filled and pressurized by the slurry. Settling in these chambers segregates the processed slurry into a high density stream and a low density stream. The low density stream is returned to the slurry make up area. The high density stream is returned to mix with the unprocessed slurry remaining in the existing slurry pipeline. A computer processor controls the amount of low density slurry withdrawn so that the final slurry density and slurry velocity meet set point values.

Abstract: Apparatus for transporting a file of successive filter rod sections lengthwise from a sender (such as a filter rod making machine) to a remote receiver (such as the magazine of a filter tipping machine) has an elongated pneumatic conduit with a section-receiving end at the sender and a section-discharging end at the receiver. The speed of lengthwise movement of sections in the conduit is monitored by a sensor which generates signals serving to control the operation of a valve which can influence the speed of the articles by varying the effective size of an outlet for the escape of air from the conduit, and/or to control the operation of a valve serving to admit into the conduit air counter to the direction of advancement of the sections. The purpose of evacuation of appropriate quantities of air from, or of admission of selected quantities of air into, the conduit is to maintain the speed of the sections in the conduit within a desired range regardless of the number of sections in the conduit.

Abstract: A miniaturized, inexpensive instrument for measuring the mass flow rate of powder, which is capable of directly outputting the mass flow rate of powder and whose characteristics are not influenced by the kind and physical properties of the powder. The instrument can be easily manufactured, installed, operated, maintained, and color change can be easily done. A constant powder feeder, which is constructed based on this instrument and an electrostatic powder coating system utilizing this feeder has a high performance and a high operational efficiency. A measuring gas with a regulated flow rate is turned into a thin-layer of high-speed gas jets by a dispersion means, thereby powder is cross-dispersed and introduced into a measuring tube, the pressure difference generated therein is measured, and a feeding means is subject to feedback control so that the output of the pressure difference coincides with a set value.

Abstract: A method for controlling a device for feeding dust-like or finely granular flowable material from at least one conveying container into a transport line, wherein the conveying containers for removal of the flowable material are simultaneously supplied with pressure and emptied, whereby, after pressure relief, the conveying containers are filled again with flowable material, includes the step of determining the optimal amount of flowable material with regard to the specific device parameters for a maximum possible filling level of the conveying containers. The amount of flowable material removed from the conveying containers is determined based on the measured relevant transporting parameters. The amount of flowable material removed is compared to the optimal amount of material to be transported.

Abstract: Apparatus for spacing consecutive capsules of solid material traveling as a capsule train in a pipeline in which the capsules are carried by a fluid flowing through the pipeline includes a separation system interposed between upstream and downstream portions of the pipeline for receiving the train of capsules. The separation system passes consecutively separated capsules within the capsule train to the downstream portion. The separation system is constructed for increasing the spacing between consecutive capsules within the capsule train in the downstream portion of the pipeline after passing through the separation system. The volume of fluid flowing from an outlet location of the separation system is substantially the same as the volume of fluid flowing into an inlet location of the separation system.

Abstract: An injector for conveying a pulverulent material is supplied with entraining air via a line and with dosing air via another line. Dosing air and entraining air are kept constant in their total rate of flow by a flow controller. This yields a particularly homogeneous powder/air mixture, which is particularly advantageous in the conveying of coating powder for coating welded seams on can bodies.

Abstract: A vacuum valve controller for a vacuum sewer system having a suction pipe which is communicated with a vacuum system by opening a vacuum valve, and which is cut off from the vacuum system by closing the vacuum valve, so that soil water in a soil water basin is sucked through the suction pipe and sent to a predetermined place by opening said vacuum valve is disclosed.

Abstract: A continuous dense phase conveying system and method regulates and modulates the volume of gas flowing at a low velocity within a material conveying pipe. In response to air volume leakage through a rotary airlock valve, a controller adjusts a flow control valve to maintain the volume of air for conveying at a selected level. The flow control valve has a venturi-shaped output section. The flow control valve is more than 90% efficient (e.g., less than 10% pressure drop across the valve) and has an output that varies linearly, over a wide range, with adjustment of the valve.

Abstract: The present invention relates to a method for operating a conveyor pipeline with pneumatic compact-flow conveying, and to an apparatus for performing the method. In this compact-flow conveying, a shunt line is disposed in a bypass around a conveyor pipeline; feed lines branch off from the shunt line and discharge into the conveyor pipeline at regular intervals via associated spill valves. With the aid of Laval ball valves, the apparatus makes a method possible in which by preventive, temporary increasing of pressure by associating and varying certain bypass air quantities at predetermined time intervals, air is additionally blown out into the conveyor pipeline via a determinable number of overpressure valves, so that even during bulk material conveying, the development of plugs can be avoided.

Abstract: An air-conveying apparatus for moving articles along a path of travel at varying speeds comprises in combination a pneumatic conveyor for supporting the articles, a fan operatively coupled to the conveyor to provide air under pressure to the pneumatic conveyor to convey the articles there along, a damper to restrict the flow of air through the fan, and a controller responsive to a signal to vary the positioning of the damper and thereby vary the flow of air through the fan and consequently vary the speed of the articles being conveyed.

Abstract: A powder feed device, especially for powder coating material, with an injector (2), in which a partial vacuum is created by a feed air stream according to the principle of a Venturi pipe and powder is drawn out of a powder container (10) and transported. An additional air stream can also be added to the feed air stream. In a computer (24), a plurality of predetermined powder feed rates (m) is stored in memory, on a calibration diagram (50), along a first diagram axis, and a plurality of feed air rates (FV) is stored in memory along a second diagram axis, for predetermined total air rates (GV) (feed air and added additional air, if needed).

Abstract: An air regulator system for a powder coating system and method of operating the system whereby air regulators constructed with inexpensive, on-off servo control valves are positioned side by side and secured to a common bracket and are operated with a pulse width modulating circuitry that quickly and accurately controls the regulator. The circuitry is carried on a circuit board which is also mounted to the common bracket.

Abstract: A vacuum control valve controls the removal of sewage or other liquid removed from a tank by a vacuum discharge pipe. The control valve uses the amount of liquid in the tank, the atmospheric pressure, and the vacuum pressure of the vacuum discharge pipe to open or close a pipe communicating section which attaches the vacuum discharge pipe to a suction pipe disposed within the tank. When the pipe communicating section is opened, the liquid is removed from the tank via the suction pipe and the vacuum discharge pipe. When the tank is emptied, a damping diaphragm allows for decompression of pressure around its peripheral portion to prevent excessive suction. An opening time adjusting valve automatically self-adjusts to control the time period for a single suction activity based on the vacuum pressure inside the vacuum discharge pipe.

Abstract: In a pneumatic filter rod conveying system a vent (12) is in the line (10) close to the distributor (2). This enables a relatively high pressure gradient to be established, with resultant high filter transfer rates at the distributor, without having excessively high pressures in the distributor and/or higher than necessary line transmission speeds. Also, there may be a selectable pressure switch (40) for reducing air pressure at the distributor when there are fewer than normal filters in the line, e.g., at the end of a run: this also allows avoidance of undesirably high line transmission speeds.

Abstract: A powder dispersion system, including a powder disperser and a control unit, supplies a controlled particle stream to a particle sizing system, instrument, or other processing device. The powder disperser includes a dynamic shear dispersion assembly and may include a fluidization assembly. An impact surface for deagglomeration of particles is located within a rapid acceleration chamber of the dynamic shear dispersion assembly. The particles are accelerated from the impact surface through an annular nozzle. A feedback loop dynamically controls the dynamic shear force applied to the aerosol transport gas, which in turn places reaction forces upon the particles, within the annular nozzle. The fluidization assembly includes a primary chamber for holding a powder sample and a secondary chamber for entraining particles of the powder sample in a transport gas stream. A pulsed gas jet directed into the primary chamber disperses particles of the powder sample into the secondary chamber.

Abstract: A bulk material conveying system includes a closed chamber having an inlet and an outlet and a conveyor communicating with the chamber outlet for receiving bulk material from the chamber. A pressurized gas is supplied to the upper portion of the chamber and to the conveyor to provide a pressure differential in the chamber which causes the bulk material in the chamber to flow through the outlet and conveyed through the conveyor. A pressure regulator is provided for automatically maintaining the pressure in the upper portion of the chamber at a predetermined value not to exceed a pressure sufficient to maintain the pressure differential during normal material flow rate conditions.

Abstract: A control system for the suction line relief valve of a hydraulic dredge is disclosed. The system includes a relief valve actuator which is hydraulically operated; a hydraulic pump powered by a motor; a directional valve; an energy storage device; and hydraulic lines connecting the hydraulic pump, the accumulator, and the relief valve actuator. The accumulator converts the hydraulic pressure in the hydraulic lines into potential energy which is used to generate hydraulic pressure if the pump fails or loses power. The pressure generated is enough for the operator to move the relief valve actuator which will reposition the relief valve to a desired position after pump failure.

Abstract: A powder feeding apparatus which has a substantially simplified structure compared to conventional powder feeding apparatuses and which can be easily installed, without requiring any substantial adjustment work. The powder feeding apparatus includes a powder flow rate measuring capillary, the inlet of which is connected to a powder introducing device and to a sensor nozzle for a powder flow rate detection gas provided with a flow control device. A pressure difference detecting device whose interior volume is invariant during normal operation is connected between the inlet and the outlet of the capillary. Further, a pressure difference adjusting device and a large-diameter feeding duct are connected together.

Abstract: A continuous dense phase conveying method and apparatus, for conveying large quantities of dry bulk material through a material conveying pipe, feed particulate material into the conveying pipe and supply a quantity of low pressure gas into the pipe to force particulate material to move therealong. A gas pressure within the conveying pipe is monitored. When this monitored pressure reaches a predetermined gas pressure level, a quantity of high pressure gas is supplied to the conveying pipe to force the particulate material to move continuously therealong.

Abstract: A device is proposed which has a nozzle, in particular constructed to resemble a Laval nozzle, as a control device for setting a prescribed fluid mass flow and in which for the purpose of varying the flowing gas quantity the nozzle cross section or the nozzle geometry can be variably set during operation.

Abstract: By utilizing two inlet pumps and one discharge pump, and controlling the speed of the discharge pump, the pressure in a slurry processing unit can be controlled to facilitate measurement and handling of compressible slurry. It has been found that multiple specific gravity measurements with water injection between the measuring stations can provide an accurate indicate of clear water to be added, even though the slurry is compressible and of varying composition, by allowing controlled undershooting of the required water at one or more injection stations, followed by accurate specific gravity measurement under closely controlled pressure and flow rate conditions, followed by a small final clear water addition.

Abstract: An apparatus for facilitating solids transport in a pneumatic conveying l. The apparatus reduces the velocity of a gas within the pneumatic conveying line. The following describes a preferred embodiment. An inner cylinder is spliced into the line. An upper portion of the inner cylinder is made of a porous material. An outer cylinder having a diameter larger than the inner cylinder encircles the inner cylinder and defines a cavity therebetween. Two solenoid valves are associated with the outer cylinder; one for purging the gas and the other for introducing a reverse jet of gas to dislodge particles from the porous material. A pressure transducer measures fluctuations across the top of the inner cylinder and is connected to a control unit which, in turn, controls the valves.

Abstract: An apparatus for pneumatically delivering fiber tufts to a fiber processing machine includes a duct; a blower having a pressure side communicating with the duct for pneumatically driving fiber tufts therein in a stream M.sub.1 ; a branch conduit extending from the duct at a branch-off location situated downstream of the blower as viewed in a direction of flow of the stream M.sub.1 for separating a stream M.sub.3 from the stream M.sub.1, leaving a stream M.sub.2 to proceed in the duct downstream of the branch-off location; and a flow varying arrangement for changing a flow rate of the stream M.sub.3 in the branch conduit. The flow varying arrangement has a throttle mechanism situated in the branch conduit.

Abstract: In a method of controlling the infeed of air from an auxiliary conduit of a pneumatic conveyor installation into a tubular conveyor conduit into which compressed gas is introduced from a connecting conduit and the latter, upon a rise in pressure occurring upstream of the mouth thereof in the conveyor direction, in the conveyor conduit, is opened with a supply of air from an auxiliary conduit at high pressure, said supply of air into the conveyor conduit is interrupted in the event of pressure equalisation building up therein, by a control member which opens and closes the connecting conduit and which is guided in a path of movement which can be acted upon by at least one secondary flow of the auxiliary conduit, and a closing force is applied in a pulse-wise fashion to the control member.

Abstract: A method and apparatus conveys solid particles from a supply device to a charging device for charging free-flowing cutting jets. Positive charging of the cutting jets even when located at a greater or remote distance from the supply device is ensured. To that end, the solid particles are transported in a closed circuit between the supply device and a charging or intermediate storage device and the momentarily required partial quantity of solid particles needed for charging the cutting jet is removed from the closed circuit.

Abstract: In a conveyor system of dust containers for using in a building, particularly an apartment house, dust discarded from respective houses is contained in a cylindrical polysheet, which is clipped at separated points to form dust capsules having a smaller diameter than the inner diameter of a vertical chute so that the capsules in the chute are subjected to air resistance. A pressure detector is provided near the bottom of the chute. In response to the output of the pressure detector the quantity of air escaping to the outside from the upper end of the chute is controlled so that the falling speed of the capsule is adjusted to a safe value.

Abstract: A method of operating a pneumatic transport system in a process line of a spinning mill, wherein fiber flocks are transported through ducts by means fo airflows generated by fans and these airflows can be influenced by units such as fans, adjustable flats, leakage air openings and induction boxes. In critical regions the respectively prevailing static pressure is measured by means of pressure sensors and, in so far as this pressure lies outside of a predetermined desired range a correction is first made at one of the units which contributes to determining this pressure in the sense of changing the pressure into the desired range or in the direction towards the desired range. The effect of this change in other critical regions effected thereby is then determined with reference to the pressure measured there and a change is subsequently effected of a further unit responsible for the pressure in these regions. The above process steps are repeated in the sense of an iterative adaptation to the desired ranges, i.

Abstract: A system for delivering a particulate material has a closed storage hopper for the material, the hopper having a bottom hopper outlet and a check valve connected to a top portion of the chamber for venting positive pressure from the chamber; a venturi eductor having a material inlet for feeding the material, an eductor outlet, and a gas inlet; a gas feed valve, the gas feed valve being openable in response to a feed signal for activating the eductor; a hopper passage connecting the hopper outlet to the eductor material inlet; a hopper outlet valve for closing the hopper outlet in response to a hopper signal; a stir valve for pressurizing the hopper passage in response to a stir signal for agitating the material in the hopper; and a pressure sensor for momentarily activating the stir signal in response to an absence of the material at the material inlet, the system being operative in a transporting mode wherein the hopper valve is open, the feed valve is open, and the stir valve is closed; a stirring mode wher

Abstract: A liquid level valve control system includes pressure responsive means compring a first chamber containing a first diaphragm having a port for applying pressure; bleed means enabling air to pass this diaphragm; and passageway means enabling air then to pass into a further chamber also containing a diaphragm operatively linked to the valve operating apparatus; so that, when a predetermined and substantially constant pressure is applied at the port, air bleeds past the first diaphragm into the further chamber to move the diaphragm therein to activate the valve control system, but when a surge of pressure is applied at the port the first diaphragm moves to block the passageway into the further chamber, thus preventing pressure being applied to the latter's diaphragm to activate the valve control system.

Abstract: A method and the related system for sampling solid materials. Materials as continuously manufactured from a compression molding machine are sampled at fixed intervals and the materials thus sampled are fed into a transport pipe so as to be transferred by being accompanied by a transport plug into an inspecting station at low speed from its stand-by position in the pipe when a gas control means is set in a feed mode. After transferring sampled materials the transport plug left at its terminal position in the transport pipe is automatically returned to the stand-by position through the transport pipe when the gas control means is set in a suction mode. By executing the above steps repeatedly, sampled materials are successively transferred into the inspecting station by being accompanied by the transport plug under unmanned operation.