A switching method of a button switching shower includes: step 1, pressing a button slidingly connected to the shower, and then the button slides; step 2, the button acts on the linking seat of the pawl for rotating the pawl; step 3, the pawl rotates the ratchet wheel through the control end of the pawl, and the shape of the elastic claw of the pawl is changed for restoring energy; step 4, the rotation of the ratchet wheel rotates the water diversion disc, and then the water diversion disc is in place, and then the water diversion disc switches the outlet functions, the stopping claw of the pawl is against the ratch of the ratchet wheel for stopping the ratchet wheel inversion; step 5, the pressing is loosened for resetting the button, and the elastic energy of the elastic claw is released for resetting the pawl.

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 method of controlling the flow of different flow paths of fluid is provided. The method includes rotating a valve to a first position, receiving a first concentrate in the first position, discharging the first concentrate through one of two outlets, rotating the valve to a second position, receiving a second concentrate in the second position, and discharging the second concentrate through one of the two outlets.

The present invention describes a device consisting of a rotor, a holding-down device, and a base plate. The base plate is normally a fluidic system, a planar fluidic system for example or a fluidic system with several fluidic ports for a directed guidance of liquids or gases through different channels, channel systems, cavities or tubing, for the combination liquid and gas streams, or for prevention of liquid flows.

Gas flow control valves comprising a valve housing including a cylindrical interior passage, and a housing opening extending from the interior passage through the housing. The gas flow control valve further comprises a cylindrical rotary valve element including a sidewall, and a rotary valve element opening extending through the sidewall. The valve element is rotatably received within the interior passage of the valve housing, such that the housing opening may be selectively aligned with the rotary valve element opening, and an area of overlap of the housing opening and the valve element opening may be varied by rotating the valve element within the interior passage of the valve housing.

A faucet with two outlets includes a main body, an outlet pipe, a hot water inlet conduit, a cold water inlet conduit, a cold water conduit, a filtered water conduit and a switch member. The outlet pipe has an inner channel and an outer channel. Filtered water flows through the inner channel, running water flows through the outer channel. The switch member laterally formed a peripheral wall of the main body, and having a valve core being mounted inside the main body. The valve core has control filtered water or running water outlet from the outlet pipe. The faucet with two outlets respectively outputs filtered water and running water through two different waterways in the outlet pipe and ensures simple structure, convenient operation and multiple water output modes.

An integrated microfluidic device for carrying out a series of fluidic operations includes a housing including a plurality of n microfluidic conduits, wherein n is at least three, and a rotating valve having an internal channel with an entrance port and an exit port that are angularly separated. The rotating valve is positionable in a first position to connect two of the n fluidic conduits via the internal channel, and upon rotating the valve to a second position, two other of the n fluidic conduits are connected by the internal channel. The device further may include one or more fluidic chambers in fluid communication with respective fluidic conduits. Fluid contained in one fluidic chamber is transferrable by application of positive or negative gas pressure through associated fluidic conduits into another fluidic chamber via the internal channel. The device may be utilized to perform a variety of fluidic operations.

A system may include a first conduit configured to form a first batch of discrete volumes of aqueous fluid separated by spacing liquid disposed between consecutive volumes of aqueous fluid, the spacing liquid being immiscible with the aqueous fluid volumes; a second conduit, fluidically coupled to the first conduit, the second conduit configured to statically hold the first batch of discrete volumes of aqueous fluid; and a third conduit configured to receive the first batch of discrete volumes of aqueous fluid from the second conduit. The third conduit can be configured to transfer the discrete volumes of aqueous fluid of the first batch for downstream 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.

An isolation valve can be used subsea such as with a fluid handling system which may be associated with a subsea Christmas tree and comprises a housing comprising a material created by a sintering process and a vertical axis defined in-between a first housing end and a second housing end; two or more seats comprising a sintered material and disposed radially opposite each other; a first annulus extending through a predetermined portion of the second housing end and the first seat at a first position radially offset from and substantially parallel to the vertical axis; a second annulus extending through a predetermined portion of the second housing end and the second seat at a second position radially offset from the first annulus along the vertical axis and substantially parallel to the housing vertical axis; a first fluid port disposed through the second end of the housing and in fluid communication with the first annulus; second fluid port disposed through the second end of the housing and in fluid communication with the second annulus; and an actuator disposed at least partially within the housing and rotatable about the vertical axis of the housing, the actuator comprising a sintered material, the actuator configured to allow fluid flow in a first rotational position of the actuator and block fluid communication in a second rotational position of the actuator, and a predetermined surface uniformly machined to a surface of the first seat which is exposed to the fluid annulus and to a surface of the second seat which is exposed to the fluid annulus, the predetermined surface defining a metal-to-metal seal at the exposed surfaces of the first seat and the second seat when the actuator is in the second rotation position.