A fluid control system in pneumatic conveying ducts of powdered or granular material, comprising: a supply source of a pressurized gas for transporting said powdered or granular material; an injection line of said gas to put said source in fluid communication with a conveying duct inside which the material is conveyed; a self-regulating pressure valve arranged on the injection line between the source and said duct; a control member of the self-regulating valve to provide a control signal to said valve representing a pressure value, said valve maintaining the gas flow supplied in said duct constant; and a flow and flow rate meter, arranged on the injection line upstream of the valve to transmit a flow and flow rate value to said control member.

In one aspect, a system for removing blockages present within a delivery conduit of a seeder may include a plurality of delivery conduits, a plurality of flow blocking devices, and a plurality of blockage sensors. A controller may be configured to determine when a blockage is present within a first delivery conduit of the plurality of delivery conduits based on measurement signals received from the plurality of blockage sensors. The controller may be further configured to control the flow blocking devices to occlude the flow of air through the other delivery conduits of the plurality of delivery conduits such that an air pressure in the first delivery conduit is increased.

In one aspect, a system for removing blockages present within a delivery conduit of a seeder may include a plurality of delivery conduits, a plurality of flow blocking devices, and a plurality of blockage sensors. A controller may be configured to determine when a blockage is present within a first delivery conduit of the plurality of delivery conduits based on measurement signals received from the plurality of blockage sensors. The controller may be further configured to control the flow blocking devices to occlude the flow of air through the other delivery conduits of the plurality of delivery conduits such that an air pressure in the first delivery conduit is increased.

In one aspect, a system for removing blockages present within a delivery conduit of a seeder may include a plurality of delivery conduits, a plurality of flow blocking devices, and a plurality of blockage sensors. A controller may be configured to determine when a blockage is present within a first delivery conduit of the plurality of delivery conduits based on measurement signals received from the plurality of blockage sensors. The controller may be further configured to control the flow blocking devices to occlude the flow of air through the other delivery conduits of the plurality of delivery conduits such that an air pressure in the first delivery conduit is increased.

In one aspect, a system for removing blockages present within a delivery conduit of a seeder may include a plurality of delivery conduits, a plurality of flow blocking devices, and a plurality of blockage sensors. A controller may be configured to determine when a blockage is present within a first delivery conduit of the plurality of delivery conduits based on measurement signals received from the plurality of blockage sensors. The controller may be further configured to control the flow blocking devices to occlude the flow of air through the other delivery conduits of the plurality of delivery conduits such that an air pressure in the first delivery conduit is increased.

A decelerating device is mounted in series within a pneumatic particulate material delivery passage that communicates from a particulate material supply to a material outlet of a furrow opener for depositing particulate material into a furrow formed by the furrow opener. The decelerating device has a duct member extending longitudinally between opposing open ends for connection in line with the pneumatic particulate material delivery passage. A plurality of exhaust openings communicating through a peripheral wall of the duct member to exhaust air therethrough. A gate member is supported on the duct member so as to be movable relative to the exhaust openings to vary a cumulative exposed area of the exhaust openings. A perforated screen member spans across the exhaust openings having a smaller aperture size than the exhaust openings to ensure small particulate materials being conveyed do not escape through the exhaust openings.

A decelerating device is mounted in series within a pneumatic particulate material delivery passage that communicates from a particulate material supply to a material outlet of a furrow opener for depositing particulate material into a furrow formed by the furrow opener. The decelerating device has a duct member extending longitudinally between opposing open ends for connection in line with the pneumatic particulate material delivery passage. A plurality of exhaust openings communicating through a peripheral wall of the duct member to exhaust air therethrough. A gate member is supported on the duct member so as to be movable relative to the exhaust openings to vary a cumulative exposed area of the exhaust openings. A perforated screen member spans across the exhaust openings having a smaller aperture size than the exhaust openings to ensure small particulate materials being conveyed do not escape through the exhaust openings.

Disclosed is a system for conveying particulate material, in which particulate material is conveyed along a conveying pipeline (117) by a flow of a conveying gas. A plurality of injector arrangements (121) are positioned along the conveying pipeline, for injecting a continuous flow of conveying gas into the pipeline. The system includes pressure differential apparatus for detecting whether a pressure differential in the pipeline between an injector arrangement and an adjacent injector arrangement is above or below a threshold value. In use each injector arrangement is operable to increase the flow rate at which conveying gas is injected into the pipeline when a pressure differential rises above the threshold value is detected between adjacent injection locations along the pipeline. The present invention provides a continuous flow of conveying gas at each of the plurality of injector arrangements, reducing the risk of blockage. Pressure differentials along the conveying pipeline are reduced. Together this facilitates stable and predictable conveying of the particulate material and reduced conveying gas usage.

Disclosed is a system for conveying particulate material, in which particulate material is conveyed along a conveying pipeline (117) by a flow of a conveying gas. A plurality of injector arrangements (121) are positioned along the conveying pipeline, for injecting a continuous flow of conveying gas into the pipeline. The system includes pressure differential apparatus for detecting whether a pressure differential in the pipeline between an injector arrangement and an adjacent injector arrangement is above or below a threshold value. In use each injector arrangement is operable to increase the flow rate at which conveying gas is injected into the pipeline when a pressure differential rises above the threshold value is detected between adjacent injection locations along the pipeline. The present invention provides a continuous flow of conveying gas at each of the plurality of injector arrangements, reducing the risk of blockage. Pressure differentials along the conveying pipeline are reduced. Together this facilitates stable and predictable conveying of the particulate material and reduced conveying gas usage.

Disclosed is a valve for use in particulate material processing. The valve has a rotatable closure member having a convex sealing surface and a resilient sealing ring moveable between a first configuration in which the sealing ring forms a seal around a circumference of the convex sealing surface; and a second position in which a circumferential gap is defined between the convex sealing surface and the sealing ring. The valve body defines a fluid-directing surface extending around the fluid passage between the inlet and the sealing ring to define an annular clearance which tapers towards the sealing ring and becomes narrower than the annular gap. When there is a pressure drop across the valve and before the closure member is moved to fully open the valve, material flowing through the valve experiences a dynamic pressure rise towards the circumferential gap, decreasing flow velocity and wear.