Abstract: An apparatus for conveying thick matter has a drive cylinder for receiving hydraulic fluid, a drive piston, which is arranged in the drive cylinder, a conveying cylinder for receiving thick matter, a conveying piston, which is arranged in the conveying cylinder, and a piston rod, which is fastened to the drive piston for coupling motion together with the conveying piston. The drive cylinder has a rod-side opening for applying pressure to a rod side of the drive piston by way of hydraulic fluid and a crown-side opening for applying pressure to a crown side of the drive piston facing away from the rod side by the hydraulic fluid. A drive pump is designed to generate a drive volume flow having a drive pressure of hydraulic fluid for moving the drive piston. A pump connection is designed for variable connection of the drive pump to the rod-side opening or the crown-side opening for the flow of hydraulic fluid.

Abstract: A method monitors the state of a device having a first drive cylinder for receiving hydraulic fluid and a first drive piston which is movably arranged in the first drive cylinder. The method determines a speed of the first drive piston, establishes a difference between the determined speed of the first drive piston and an expected speed of the first drive piston, and determines a faulty state as a function of the difference established between the determined speed of the first drive piston and the expected speed of the first drive piston.

Abstract: A fuel filter element has a screen fabric as a filter medium and a support tube supporting the screen fabric. A valve body guide for guiding a spherical valve body is provided. The valve body guide has a fluid channel and one or more support ribs for supporting the spherical valve body. The support ribs extend along a longitudinal direction of the fluid channel and project radially into the fluid channel. A filter assembly with such a fuel filter element is provided. The filter assembly has a ball valve with spherical valve body and a filter housing with a valve seat for the spherical valve body of the ball valve.

Abstract: A method operates a construction material and/or viscous-material pump having: at least one conveying cylinder, the conveying cylinder being designed to receive and discharge construction material and/or viscous material; and at least one conveying piston, the conveying piston being disposed in the conveying cylinder for movement in order to draw construction material and/or viscous material into the conveying cylinder and to displace drawn-in construction material and/or viscous material out of the conveying cylinder.

Abstract: A fuel filter element has a screen fabric as a filter medium and a support tube supporting the screen fabric. A valve body guide for guiding a spherical valve body is provided. The valve body guide has a fluid channel and one or more support ribs for supporting the spherical valve body. The support ribs extend along a longitudinal direction of the fluid channel and project radially into the fluid channel. A filter assembly with such a fuel filter element is provided. The filter assembly has a ball valve with spherical valve body and a filter housing with a valve seat for the spherical valve body of the ball valve.

Abstract: A vehicle having a thick matter pump has multiple supporting devices, a rotatable mast assembly with part-mast members, and a hydraulic drive assembly with hydraulic drives for the supporting devices and the mast assembly. A valve assembly is provided for the hydraulic drive assembly. The valve assembly has a group of proportional valves and a group of switching valve devices which are each connected to at least one hydraulic drive of the supporting devices or the part-mast members. The switching valve devices are connected downstream of the proportional valves. Exactly one switching valve device is supplied by exactly one proportional valve and is connected downstream of exactly one proportional valve such that outputs of the proportional valves lead exclusively to inputs of the switching valve devices.

Abstract: A method monitors the state of a device having a first drive cylinder for receiving hydraulic fluid and a first drive piston which is movably arranged in the first drive cylinder. The method determines a speed of the first drive piston, establishes a difference between the determined speed of the first drive piston and an expected speed of the first drive piston, and determines a faulty state as a function of the difference established between the determined speed of the first drive piston and the expected speed of the first drive piston.

Abstract: A vehicle having a thick matter pump has multiple supporting devices, a rotatable mast assembly with part-mast members, and a hydraulic drive assembly with hydraulic drives for the supporting devices and the mast assembly. A valve assembly is provided for the hydraulic drive assembly. The valve assembly has a group of proportional valves and a group of switching valve devices which are each connected to at least one hydraulic drive of the supporting devices or the part-mast members. The switching valve devices are connected downstream of the proportional valves. Exactly one switching valve device is supplied by exactly one proportional valve and is connected downstream of exactly one proportional valve such that outputs of the proportional valves lead exclusively to inputs of the switching valve devices.

Abstract: A hydraulic drive system for a construction material pump has a hydraulic circuit for hydraulic fluid, a feed pump which is designed to feed hydraulic fluid into the hydraulic circuit, at least one controllable pressure-limiting valve unit, which is designed for variable adjustment of a limit pressure of hydraulic fluid of at least one portion of the hydraulic circuit within a pressure range, and a control unit. The control unit is designed to control the pressure-limiting valve unit according to at least one operating parameter of the hydraulic drive system and/or according to the hydraulic fluid in such a way that the pressure-limiting valve unit adjusts the limit pressure of the portion of the hydraulic circuit.

Abstract: An apparatus for conveying thick matter has a drive cylinder for receiving hydraulic fluid, a drive piston, which is arranged in the drive cylinder, a conveying cylinder for receiving thick matter, a conveying piston, which is arranged in the conveying cylinder, and a piston rod, which is fastened to the drive piston for coupling motion together with the conveying piston. The drive cylinder has a rod-side opening for applying pressure to a rod side of the drive piston by way of hydraulic fluid and a crown-side opening for applying pressure to a crown side of the drive piston facing away from the rod side by the hydraulic fluid. A drive pump is designed to generate a drive volume flow having a drive pressure of hydraulic fluid for moving the drive piston. A pump connection is designed for variable connection of the drive pump to the rod-side opening or the crown-side opening for the flow of hydraulic fluid.

Abstract: A hydraulic drive system for a construction material pump has a hydraulic circuit for hydraulic fluid, a feed pump which is designed to feed hydraulic fluid into the hydraulic circuit, at least one controllable pressure-limiting valve unit, which is designed for variable adjustment of a limit pressure of hydraulic fluid of at least one portion of the hydraulic circuit within a pressure range, and a control unit. The control unit is designed to control the pressure-limiting valve unit according to at least one operating parameter of the hydraulic drive system and/or according to the hydraulic fluid in such a way that the pressure-limiting valve unit adjusts the limit pressure of the portion of the hydraulic circuit.

Abstract: A fuel filter element has a screen fabric as a filter medium and a support tube supporting the screen fabric. A valve body guide for guiding a spherical valve body is provided. The valve body guide has a fluid channel and one or more support ribs for supporting the spherical valve body. The support ribs extend along a longitudinal direction of the fluid channel and project radially into the fluid channel. A filter assembly with such a fuel filter element is provided. The filter assembly has a ball valve with spherical valve body and a filter housing with a valve seat for the spherical valve body of the ball valve.

Abstract: A water separation element is provided with a cylindrical woven fabric screen for separating water. The woven fabric screen is made of woven fabric yarns positioned angularly relative to each other. A first annular support piece is arranged at a first end face of the woven fabric screen and is fixedly connected to a rim area of the woven fabric screen. The first annular support piece has a lateral edge facing the woven fabric screen. The woven fabric screen is flowed through in radial direction. The woven fabric yarns of the woven fabric screen are positioned, at least over sections, at an angle greater than 0° and smaller than 90° relative to the facing lateral edge of the first annular support piece. A second annular support piece is connected to the second end face. A filter element and a filter device with such a water separation element are provided.

Abstract: A filter element arranged in a filter housing is provided with an annular filter medium flowed through by a liquid medium in a flow direction radial to a longitudinal axis of the filter element. A clean chamber is arranged in the flow direction of the liquid medium downstream of the filter medium. A filtered liquid medium outlet is fluidically connected to the clean chamber. A cylinder-shaped water separating screen is arranged in the clean chamber to separate water contained in the liquid medium. A water outlet opening fluidically connects the clean chamber to a water collecting chamber of the filter housing. A particle filter is arranged at the water outlet opening or arranged between the water outlet opening and the filtered liquid medium outlet of the filter element. The water outlet opening of the filter element is fluidically connected with the water collecting chamber of the filter housing.

Abstract: A coalescing element for a water separator device for fuel is provided with at least one coalescing medium that separates water contained in the fuel from the fuel. The coalescing element is arranged in a housing of the water separator device such that the coalescing element separates at least one fuel inlet of the housing from at least one fuel outlet of the housing. The at least one coalescing medium is arranged in a flow path of the fuel from the at least one fuel inlet to the at least one fuel outlet. The at least one coalescing medium contains at least one sponge-like coalescing material suitable for coalescing water. The coalescing element is used in fuel filters such as diesel fuel filters of an internal combustion engine.

Abstract: A filter element arranged in a filter housing is provided with an annular filter medium flowed through by a liquid medium in a flow direction radial to a longitudinal axis of the filter element. A clean chamber is arranged in the flow direction of the liquid medium downstream of the filter medium. A filtered liquid medium outlet is fluidically connected to the clean chamber. A cylinder-shaped water separating screen is arranged in the clean chamber to separate water contained in the liquid medium. A water outlet opening fluidically connects the clean chamber to a water collecting chamber of the filter housing. A particle filter is arranged at the water outlet opening or arranged between the water outlet opening and the filtered liquid medium outlet of the filter element. The water outlet opening of the filter element is fluidically connected with the water collecting chamber of the filter housing.

Abstract: The invention relates to a filter element (10) having a first fluid path (12) on a raw side (60) for filtering a first fluid (64) and a second fluid path (14) having a fluid line (16) on a clean side (62) for carrying a second fluid (66). The filter element (10) is provided at least on one side with a first end plate (20). Here, the fluid line (16) is arranged in the central inner region (36) of the filter element (10) and connected with the end plate (20) for joint disassembly, especially securely connected to the filter element. The invention further relates to a filter system (100) including such a filter element (10).

Abstract: The invention relates to a filter element (10) having a first fluid path (12) on a raw side (60) for filtering a first fluid (64) and a second fluid path (14) having a fluid line (16) on a clean side (62) for carrying a second fluid (66). The filter element (10) is provided at least on one side with a first end plate (20). Here, the fluid line (16) is arranged in the central inner region (36) of the filter element (10) and connected with the end plate (20) for joint disassembly, especially securely connected to the filter element. The invention further relates to a filter system (100) including such a filter element (10).

Abstract: A hydraulic system, preferably for actuating and engaging a mobile slurry pump, includes a primary circuit, actuating a first hydraulic consumer, which circuit has a hydraulic drive assembly including at least one motor-driven hydraulic pump. The hydraulic system further includes a secondary circuit, actuating a second hydraulic consumer, which circuit has a second hydraulic drive assembly including at least one additional motor-driven hydraulic pump. In a first operating state, hydraulic oil from a common tank can be admitted to the hydraulic consumers arranged in the primary circuit and in the secondary circuit via the hydraulic drive assemblies thereof, independently of one another. In a second operating state, a portion of the hydraulic oil is supplied from the primary circuit to the secondary circuit to actuate the second consumer.

Abstract: Disclosed is a control system for a hydraulic work machine, comprising a plurality of hydraulic work circuits for supplying actuators and/or drive units of movable machine parts with hydraulic fluid, and an emergency stop circuit for the work circuits for avoiding danger caused by the machine parts. According to this disclosure, the emergency stop circuit comprises a single safety valve which is connected in parallel to the work circuits via at least one branch line each at the inlet and to a pressure relief point at the outlet.