Systems and methods for controlling flow with a rotatable valve are provided. A described system includes a valve body having a valve chamber and a plurality of ports into the valve chamber. The plurality of ports include a first port, a second port, and a third port. The first port and the second port are aligned with a common axis and located on opposite sides of the valve chamber. The system further includes a valve member located within the valve chamber. The valve member is controllably rotatable to modulate fluid flow between the first port and the third port while maintaining the second port completely closed and to modulate fluid flow between the second port and the third port while maintaining the first port completely closed.

A portable water path switching device includes a valve body, a water diversion member, and a switching assembly. The valve body is provided with a valve cavity, a water inlet communicating with the valve cavity, and at least two water outlets. The water diversion member is arranged in the valve cavity and at least provided with first water diversion holes and second water diversion holes. The first water diversion holes communicate with the first water outlet, and the second water diversion holes communicate with the second water outlet. The switching assembly is movably connected to the valve body and includes seal balls. When the switching assembly is driven, the seal balls switchably block the first water diversion holes and the second water diversion holes, so that water flow of the water inlet switchably flows to the second water outlet and the first water outlet.

A multi-port, rotary actuated valve assembly for controlling fluid flow in a vehicle is provided, which includes a valve housing defining a puck-receiving cavity. A puck is positioned within the puck-receiving cavity and is rotatable therein. The puck has a plurality of chambers that interconnect different combinations of ports provided in the valve housing depending on the rotational position of the puck. The chambers in the puck include at least a first chamber and a second chamber, each of which include a chamber opening on the distal end of the puck. The opening to the first chamber on the distal end of the puck is radially inboard of the opening to the second chamber such that at least two separate and parallel fluid flow paths are provided on the distal end of the puck along which fluid may enter or exit the first and second chambers, respectively.

Various embodiments of the teachings relate to a system or method for sample preparation or analysis in biochemical or molecular biology procedures. The sample preparation can involve small volume processed in discrete portions or segments or slugs, herein referred to as discrete volumes. A molecular biology procedure can be nucleic acid analysis. Nucleic acid analysis can be an integrated DNA amplification/DNA sequencing procedure.

A valve device includes a housing, a valve, a partition wall, and a seal member. The partition wall is fit into the housing. The housing includes a first cylindrical inner wall, a second cylindrical inner wall, and a third inner wall. The second cylindrical inner wall is tapered from the third inner wall to the first cylindrical inner wall and the third inner wall defines a housing through hole. The partition wall defines a partition wall through hole that extends in the radial direction and that overlaps with both the first cylindrical inner wall and the second cylindrical inner wall in the radial direction. An annular space that is in communication with both the partition wall through hole and the housing through hole is defined between the second cylindrical inner wall and the outer wall of the partition wall.

A method for forming discrete volumes of aqueous fluid may comprise flowing aqueous fluid into a first conduit from a supply of aqueous fluid and flowing into the first conduit a spacing liquid supplied from a second conduit, the spacing liquid being immiscible with the aqueous fluid. The flowing of the aqueous fluid and the spacing liquid into the first conduit forms discrete volumes of the aqueous fluid, with consecutive discrete volumes of the aqueous fluid separated by the spacing liquid. The method may further comprise transferring the discrete volumes of the aqueous fluid and spacing liquid from the first conduit to a third conduit for processing.

In general, one aspect disclosed features a medical device, comprising: a four-way medical stopcock, comprising: a body defining a cock barrel and comprising: a first stem having a first port, a second stem having a second port, and a side stem having a side port; and a rotatable cock disposed within the cock barrel, wherein: the cock places the first port and second port in fluid communication when the cock is in a first position, and the cock places the first port, second port, and side port in fluid communication when the cock is in a second position; and a needleless valve having a valve stem, wherein the valve stem is disposed within the side stem such that an internal volume defined by the side stem, the valve stem, and the cock when the cock is in the third position, is approximately 0.09 ml.

A multi-mode fluid control valve that has a housing with a fluid control chamber having a first end wall with at least one passage and a second end wall with at least two passages. There is also a puck positioned in the fluid control chamber that is rotatably connected to a drive shaft at a drive shaft connection aperture in the puck. The puck has a first side facing the first end wall of the flow control chamber. The puck has at least two passages separated by divider walls. The puck further includes at least one flow diverter extending between the first side of the puck to the second side of the puck. The flow diverter is adjacent one of the two passages and is configured to divert fluid in the fluid control chamber toward the passage that is adjacent the flow diverter.

A multi-mode fluid control valve that has a housing with a fluid control chamber having a first end wall with at least one passage and a second end wall with at least two passages. There is also a puck positioned in the fluid control chamber that is rotatably connected to a drive shaft at a drive shaft connection aperture in the puck. The puck has a first side facing the first end wall of the flow control chamber. The puck has at least two passages separated by divider walls. The puck further includes at least one flow diverter extending between the first side of the puck to the second side of the puck. The flow diverter is adjacent one of the two passages and is configured to divert fluid in the fluid control chamber toward the passage that is adjacent the flow diverter.

A coolant control ball valve assembly comprises a housing that includes a housing chamber. The coolant control ball valve assembly further comprises a channel and a plurality of ports that extend from the housing chamber, and a valve element positioned in line with the channel and the plurality of ports. Additionally, the coolant control ball valve assembly comprises an actuator assembly in communication with the valve element. The actuator assembly includes an expansion element, and linear translation of the actuator assembly results in rotational translation of the valve element. Further, the coolant control ball valve comprises a flow diverter positioned adjacent the valve element. The flow diverter allows for coolant to reach a minimum velocity around the expansion element.