A valve device is provided. In the valve device, a valve element is rotated about a support shaft, based on rotation of a valve element drive member to switch a through hole that communicates with an outlet formed in a valve seat to adjust a flow rate. The through hole opens in a bottom surface of a flow channel securing groove formed in the valve element. The flow channel securing groove has a long hole shape in which a width in a first direction being a moving direction of the valve element, is smaller than a width in a second direction orthogonal to the first direction. Thus, a region overlapping with the outlet is large as compared to a case where a perfect circular flow channel securing groove is formed.

A water valve may comprise a valve shell, and a rotating base is installed in the valve shell. A lower end of the rotating base is sequentially connected to a driving valve piece and a fixed valve piece which are installed in the valve shell. A center of a top portion of the rotating base comprises a valve rod upwardly protruding out of the valve shell. The rotating base is configured to engage with the driving valve piece, and through operating the valve rod, the rotating base driven by the valve rod is adapted to drive and have synchronous rotation with the driving valve piece so as to change the relative positions between the driving valve piece and the fixed valve piece and then to control on/off operation of a faucet, ratio of hot and cold water and the amount of water flow.

A water valve may include a valve shell, and a rotating base is installed in the valve shell. A lower end of the rotating base is sequentially connected to a driving valve piece and a fixed valve piece, and the driving valve piece and the fixed valve piece are installed in the valve shell. A bottom portion of the driving valve piece comprises a concave portion to form a mixing chamber, and the mixing chamber has a first mixing space and a second mixing space, and the diameter of the first mixing space is larger than the second mixing space so as to increase the coverage of the mixing chamber. Each of two sides of the second mixing space comprises a pressure relief slot.

A control valve includes a valve housing, a joint member, a valve body, and a sealing tube member. A seal ring, which receives a liquid pressure inside the valve housing and comes into tight contact with the joint member and the sealing tube member, is provided between the joint member and the sealing tube member. The sealing tube member has a biasing pressure receiving surface receiving the liquid pressure inside the valve housing in a direction along a direction of the valve body. The seal ring is disposed at a position where the sealing tube member is not pressurized in the direction of the valve body. An area of a valve sliding contact surface is set to be larger than an area of the biasing pressure receiving surface.

A directional control and servo valve is provided. The valve includes a valve housing and a valving element. The valve housing includes a space, and a plurality of first cavities. The valving element includes two sides thereof. Each side includes a plurality of second cavities that corresponds the plurality of first cavities. The valving element includes plurality of webs formed in the plurality of second cavities. Each web separates the plurality of second cavities on each side from each other. The plurality of webs includes a plurality of holes adapted to connect the plurality of second cavities of both sides. The valving element is disposed in the space of the valve housing such that a plurality of control edges is configured that separates at least one first cavity with respective at least one second cavity to form control orifices that are symmetrical along both sides of the valving element.

A synchronous switch valve core with a voltage stabilizing function, comprising: a valve core housing (1), a valve core base (2), a flow regulating module, and a balancing hydraulic module. The flow regulating module is capable of cutting off a cold/hot water path before water enters a pressure balancing module, thus preventing high-temperature water from immersing the valve core, preventing the building of lime scale, protecting the valve core, and extending the service life; moreover, water flow can enter the pressure balancing module only after flowing through the flow regulating module, thus preventing the channeling of hot and cold, and obviating the need to install a check valve at a water intake elbow. By means of an optimized design with respect to the parts of the synchronous switch valve core, the synchronous valve core is transformed from a switch capable only of regulating flow into a switch not only capable of regulating flow but also capable of synchronized switching, and also capable of balancing the pressures within two channels, thus transforming a product equipped with the vale core from a complex channel into a simple channel, and obviating the need for separately providing a balancing module part; a valve body is structurally simple, has a shortened water path, and is inexpensive.

A pressure reducing valve includes: a housing having an input port, an input channel connected to the input port, a pressure reducing chamber connected to the input channel, a delivery channel connected to the pressure reducing chamber, an output channel and an auxiliary channel branched off from the delivery channel, an output port connected to the output channel, and an auxiliary port connected to the auxiliary channel; and a valve mechanism which is provided inside the pressure reducing chamber connected to the delivery channel and of which the amount of opening is changed to regulate the pressure inside the pressure reducing chamber. Centerlines of the delivery channel, the output channel, and the auxiliary channel are arranged in the same plane.

A fluid control device includes a fluid manifold, a valve stator, a valve rotor and dual driving units. The fluid manifold includes microchannels connected with a sample reaction unit and fluid input channels connected with fluid sources. When the valve rotor is rotated to different positions, the fluid input channel is connected with at least one microchannel via through holes of the valve stator and a groove of the valve rotor. The first driving unit drives a rotation of the valve rotor. The second driving unit drives a motion of the valve rotor or the valve stator to adjust a distance between the valve rotor and the valve stator, so that when the valve rotor is rotating, the valve rotor and the valve stator are separated by a gap, and after the valve rotor is rotated to a predetermined position, the valve rotor is tightly contacted the valve stator.

The servovalve incorporates a rotating plate valving element which connects between the valve ports through cavities formed inside it. The valving element cavities are formed symmetrically in both the valving elements sides, where each pair of symmetrical cavities is optionally separated by a stiffening web. Holes through the webs connect between the symmetrical cavities. The control orifices are formed between some edges in the valving element cavities and edges of cavities in adjacent fixed elements surrounding the valving element and properly designed for this purpose. The flow ducts inside the valves are formed by the cavities in the valving element and the adjacent parts to provide enough flowing cross sectional areas. The control orifices are formed in pairs at both valving element sides to duplicate the area and provide symmetry for flow forces lateral components balance. Each portion of the valving elements is subjected to the same pressure at its both sides to provide static balance. The rotational movement generates relatively large control orifice from rotary or linear drivers of short strokes. Thin valving elements with cavities provide lowest inertia for high speed of response.

A fluid control device includes a fluid manifold, a valve stator, a valve rotor and dual driving units. The fluid manifold includes microchannels connected with a sample reaction unit and fluid input channels connected with fluid sources. When the valve rotor is rotated to different positions, the fluid input channel is connected with at least one microchannel via through holes of the valve stator and a groove of the valve rotor. The first driving unit drives a rotation of the valve rotor. The second driving unit drives a motion of the valve rotor or the valve stator to adjust a distance between the valve rotor and the valve stator, so that when the valve rotor is rotating, the valve rotor and the valve stator are separated by a gap, and after the valve rotor is rotated to a predetermined position, the valve rotor is tightly contacted the valve stator.