A two-stage thermal hydraulic engine utilizes the expansion and contraction of a working fluid to convert heat energy to mechanical or electrical energy. The transfer of heat to and from the working fluid occurs in at least two process heat exchangers and may be aided by thin twisted strips of a thermally conductive material that are in contact with the working fluid. The engine does not require the working fluid to undergo a phase change to operate. The subsequent expansion of the working fluid is used to drive pistons contained within at least two triplex hydraulic cylinders. The pistons may be alternately and sequentially driven to pump a fluid with a laminar flow and at a constant pressure. The cylinders may include a self-lubrication system.

A peristaltic pump for conveying fluid in an apparatus for extracorporeal blood treatment includes a pump housing that accommodates a rotor. The rotor includes squeezing elements offset against each other in the circumferential direction. The pump housing includes a support surface extending in a curved shape around the rotor's axis. The support surface is radially spaced from the rotor and arranged to support a tube segment radially inserted between the rotor and the support surface. The rotor is driven by a rotor shaft, the rotary movement of which can be transmitted to a rotor base body via a freewheel press-fitted into a toothed driver sleeve. The freewheel has bearing positions for the rotor base body on both sides of the freewheel. To ensure coaxiality between the freewheel and the bearing support of the rotor base body, the bearing positions are defined by the geometry of the finished driver sleeve.

The present invention discloses a hydraulic fracturing system for driving a plunger pump with a turbine engine using a drive train. The driving train may include a reduction gearbox and a transmission device. The turbine engine is connected to an input of the reduction gearbox, an output of the reduction gearbox is connected to an input of the transmission device, and an output of the transmission device is connected to a drive input of the fracturing pump. The transmission device is configured to be switchable to one of a set of rotational speed conversion ratios. The transmission device may further include a clutch for effectuate a switching between the set of rotational speed conversion ratios. The drivetrain may alternatively or further include a torque convertor disposed between the reduction gearbox and the transmission device.

A piston member for a high-pressure pump for pumping fluid in a sample separation apparatus, wherein the piston member comprises a piston configured for being mountable to reciprocate in a piston chamber for displacing fluid, and a sealing for sealing between the piston member and the piston chamber when the piston member is mounted in the piston chamber to reciprocate, wherein the sealing is mounted on the piston so as to reciprocate together with the piston.

The present application relates to an actuation device for a piston of a syringe. The actuation device comprises a holder for a barrel of the syringe, a coupling which is linearly movable relative to the holder and has a seat into which the piston of the syringe can be inserted, at least one securing element with which the piston can be secured releasably in the seat, and a linear drive for the coupling. The coupling has at least two electrically conductive contact elements which are arranged inside the seat in order to come into contact with corresponding electrically conductive contact faces of the piston when the piston is inserted into the seat. The present application further relates to a sampling system with an actuation device and with at least one syringe, and also to a syringe suitable for the sampling system.

The present application relates to an actuation device for a piston of a syringe. The actuation device comprises a holder for a barrel of the syringe, a coupling which is linearly movable relative to the holder and has a seat into which the piston of the syringe can be inserted, at least one securing element with which the piston can be secured releasably in the seat, and a linear drive for the coupling. The coupling has at least two electrically conductive contact elements which are arranged inside the seat in order to come into contact with corresponding electrically conductive contact faces of the piston when the piston is inserted into the seat. The present application further relates to a sampling system with an actuation device and with at least one syringe, and also to a syringe suitable for the sampling system.

A pressure exchanger includes a rotor including rotor ducts extending parallel to an axis, a first end cover disposed at a first side of the rotor, and a second end cover disposed at a second side of the rotor. The rotor is configured to rotate about the axis, communicate first fluid and second fluid through the rotor ducts, control pressure of the first fluid or the second fluid discharging from the rotor, and allow a least a portion of the first fluid to contact the second end cover to thereby reduce or eliminate a dead volume inside of the rotor. The second fluid includes a flush volume that passes through the rotor ducts.

A pressure exchanger includes a rotor including rotor ducts extending parallel to an axis, a first end cover disposed at a first side of the rotor, and a second end cover disposed at a second side of the rotor. The rotor is configured to rotate about the axis, communicate first fluid and second fluid through the rotor ducts, control pressure of the first fluid or the second fluid discharging from the rotor, and allow a least a portion of the first fluid to contact the second end cover to thereby reduce or eliminate a dead volume inside of the rotor. The second fluid includes a flush volume that passes through the rotor ducts.

A pump for pumping fluid, wherein the pump includes a working chamber, a piston assembly configured for reciprocating within the working chamber to thereby displace fluid, a piston actuator being rigidly assembled with the piston assembly at least in a working mode of the pump to thereby transmit drive energy to the piston assembly to reciprocate along a common rigid axis of the piston-actuator-assembly, and a bearing arrangement bearing the piston assembly and the piston actuator in the pump so that the piston-actuator-assembly provided by the piston assembly and the piston actuator is capable of performing a pendulum-type compensation motion around a pendulum point at the piston actuator on the common rigid axis.

A peristaltic pump for conveying fluid in an apparatus for extracorporeal blood treatment includes a pump housing that accommodates a rotor. The rotor includes squeezing elements offset against each other in the circumferential direction. The pump housing includes a support surface extending in a curved shape around the rotor's axis. The support surface is radially spaced from the rotor and arranged to support a tube segment radially inserted between the rotor and the support surface. The rotor is driven by a rotor shaft, the rotary movement of which can be transmitted to a rotor base body via a freewheel press-fitted into a toothed driver sleeve. The freewheel has bearing positions for the rotor base body on both sides of the freewheel. To ensure coaxiality between the freewheel and the bearing support of the rotor base body, the bearing positions are defined by the geometry of the finished driver sleeve.