The present disclosure provides an oil-scavenge pump, which includes a cap member, a piston member, a resilient member and a filter member. The filter member interconnects the cap member and the piston member. The resilient member is disposed between the cap member and the piston member. The cap member includes a cap head, a pump valve connected to the cap head, a first-resilient unit disposed and a first sphere disposed between the first-resilient unit and the pump valve. The piston member includes a main portion, a piston seat, a second-resilient unit, a second sphere and a rod portion. The piston seat has two ends respectively connected to the piston head and the rod portion. The second-resilient unit and the second sphere are disposed between the piston head and the piston seat. The filter member is mounted to surround the rod portion and engaged with the pump valve.

The present disclosure provides an oil-scavenge pump, which includes a cap member, a piston member, a resilient member and a filter member. The filter member interconnects the cap member and the piston member. The resilient member is disposed between the cap member and the piston member. The cap member includes a cap head, a pump valve connected to the cap head, a first-resilient unit disposed and a first sphere disposed between the first-resilient unit and the pump valve. The piston member includes a main portion, a piston seat, a second-resilient unit, a second sphere and a rod portion. The piston seat has two ends respectively connected to the piston head and the rod portion. The second-resilient unit and the second sphere are disposed between the piston head and the piston seat. The filter member is mounted to surround the rod portion and engaged with the pump valve.

A hydraulic pumping system in accordance with embodiments comprises a breast interface operably coupled to an actuatable assembly by means of an actuatable assembly interface. The breast interface comprises a distal membrane coupled to a housing to form a fluid reservoir therebetween. The actuatable assembly interface comprises a proximal membrane. The distal and proximal membranes are fluidly coupled via a tube carrying a driving fluid. The actuatable assembly interface is configured to removably couple to the actuatable assembly, in order to operably couple the actuatable assembly to the breast interface. The actuatable assembly interface comprises a fluid shut off mechanism to reversibly shut off fluid communication between the breast interface and the actuatable assembly interface when the actuatable assembly interface is decoupled from the actuatable assembly.

A hydraulic pumping system in accordance with embodiments comprises a breast interface operably coupled to an actuatable assembly by means of an actuatable assembly interface. The breast interface comprises a distal membrane coupled to a housing to form a fluid reservoir therebetween. The actuatable assembly interface comprises a proximal membrane. The distal and proximal membranes are fluidly coupled via a tube carrying a driving fluid. The actuatable assembly interface is configured to removably couple to the actuatable assembly, in order to operably couple the actuatable assembly to the breast interface. The actuatable assembly interface comprises a fluid shut off mechanism to reversibly shut off fluid communication between the breast interface and the actuatable assembly interface when the actuatable assembly interface is decoupled from the actuatable assembly.

The present invention relates to a membrane-based piston pump (400) for pumping a liquid product. The pump is provided with a device (426) for maintaining a pre-defined hydraulic fluid volume in the pump. The device comprises an axle element (440) and a bushing element (432). The invention further relates to a method for pumping a liquid product in a pump. Furthermore, the invention relates to a homogenizer provided with a membrane-based piston pump.

The present invention relates to a membrane-based piston pump (400) for pumping a liquid product. The pump is provided with a device (426) for maintaining a pre-defined hydraulic fluid volume in the pump. The device comprises an axle element (440) and a bushing element (432). The invention further relates to a method for pumping a liquid product in a pump. Furthermore, the invention relates to a homogenizer provided with a membrane-based piston pump.

A peritoneal dialysis system includes a control unit configured to cause (i) a fluid inlet valve and a fluid outlet valve to occlude a fluid inlet line and a fluid outlet line, respectively, while a linear actuator moves a piston to create a positive pressure within a pump housing, the positive pressure measured by a pressure sensor, and (ii) the fluid inlet valve to occlude the fluid inlet line and the fluid outlet valve to open the fluid outlet line, while the linear actuator moves the piston so as to maintain the positive pressure within the pump housing while fluid is pumped out of the fluid pump chamber via the opened fluid outlet line.

A diaphragm pump may comprise a housing defining a first pumping chamber, a second pumping chamber, and a hydraulic fluid chamber, a first flexible diaphragm separating the first pumping chamber from the hydraulic fluid chamber, a second flexible diaphragm separating the second pumping chamber from the hydraulic fluid chamber, a rod mechanically linking the first flexible diaphragm and the second flexible diaphragm such that an expansion of one of the first and second flexible diaphragms exerts a contraction force on the other of the first and second flexible diaphragms, and a piston disposed within the hydraulic fluid chamber and configured to reciprocate to cause a hydraulic fluid contained within the hydraulic fluid chamber to alternately exert an expansion force on the first and second flexible diaphragms.

A diaphragm pump may comprise a housing defining a first pumping chamber, a second pumping chamber, and a hydraulic fluid chamber, a first flexible diaphragm separating the first pumping chamber from the hydraulic fluid chamber, a second flexible diaphragm separating the second pumping chamber from the hydraulic fluid chamber, a rod mechanically linking the first flexible diaphragm and the second flexible diaphragm such that an expansion of one of the first and second flexible diaphragms exerts a contraction force on the other of the first and second flexible diaphragms, and a piston disposed within the hydraulic fluid chamber and configured to reciprocate to cause a hydraulic fluid contained within the hydraulic fluid chamber to alternately exert an expansion force on the first and second flexible diaphragms.

Membrane pump device, wherein the membrane pump device comprises a housing, and the housing contains a first and a second chamber, wherein the first chamber is separated from the second chamber by a movable membrane, while a liquid being pumped can be introduced in the first chamber, and a drive liquid can be introduced into the second chamber, wherein the second chamber has an outlet opening, and the outlet opening is present on an outer side of the housing. The membrane pump device is characterized in that the membrane pump device comprises a valve, while the valve is arranged at the outlet opening and closes off the second chamber from the outside.