A gas transportation device includes an inlet plate, a substrate, a resonance plate, an actuating plate, a piezoelectric component and an outlet plate stacked sequentially. The gas transportation device includes a valve disposed within at least one of the inlet of the inlet plate and the outlet of the outlet plate. A first chamber is formed between the resonance plate and the actuating plate, and a second chamber is formed between the actuating plate and the outlet plate. When the piezoelectric component drives the actuating plate, a pressure gradient is formed between the first and second chambers and the valve is opened. Accordingly, gas is inhaled into the convergence chamber via the inlet, transported into the first chamber through a central aperture of the resonance plate, transported into the second chamber through a vacant space of the actuating plate, and then discharged out from the outlet, so as to transport the gas.

A fluid bladder valve for a pneumatic vehicle seat adjustment device is disclosed. The valve comprises a first chamber configured to connect to a fluid source, a second chamber configured to connect to the fluid bladder, a third chamber configured to connect to an environment, a fourth chamber connected to the first chamber via a first fluid passage, connected to the second valve chamber via a second fluid passage, and connected to the third valve chamber via a third fluid passage; and an actuator comprising a blocking element disposed in the fourth chamber and an actuator element disposed in the third valve chamber and coupled to the blocking element and configured to move the blocking element between a first position wherein the first passage is opened and the third passage is closed, and a second position wherein the first passage is closed and the third passage is opened.

A control valve includes a casing, a valve body, and a seal cylindrical member. The casing includes an inlet and an outlet. The valve body is rotatably disposed inside the casing and includes a circumferential wall portion in which a valve hole that allows the inside and outside to communicate is formed. The seal cylindrical member includes one end portion which communicates with a downstream side of an outlet and the other end portion on which a valve sliding contact surface is provided. In the other end portion of the seal cylindrical member, a protrusion height changes continuously in a circumferential direction along a shape of an outer circumferential surface of the circumferential wall portion. A thick portion which is thicker compared to other portions is provided in a region of the other end portion of the seal cylindrical member at which the protrusion height is high.

A piezoelectric ring bender servo valve assembly reduces mechanical wear by removing mechanical components used in prior art servo valves. The assembly does not use torque motor, flapper, and feedback spring. In this manner, no moving parts are required, which reduces maintenance and costs. A pair of piezoelectric ring benders mount adjacently to a pair of nozzles. The piezoelectric ring benders independently regulate the flow of fluid through the nozzles by moving between an open position to enable flowage, and a closed position to restrict flowage. A linear position sensing device measures and provides feedback about the spool position to a valve controller. The valve controller allows the spool valve to move until valve position achieves command position and the force on the spool valve is in equilibrium with pressure difference across spool valve. An H-bridge operable to switch the polarity of a differential pressure applied across to a load.

An actuator including a housing, a piezo electric disc having a first side and a second side and defining an outer rim, an elastomeric seal, wherein the outer rim is received in the housing and the elastomeric seal engages the first side proximate the outer rim to seal the first side to the housing, the elastomeric seal engages the second side proximate the outer rim to seal the second side to the housing.

A fluidic control valve configured to control a flow of fluid through a conduit includes a piezostack actuator, a seal plate having a sealing face, an orifice plate including a plurality of orifices, and a suspension connected to the seal plate. The piezostack actuator is configured to displace the seal plate along a longitudinal axis of the conduit between a closed position, in which the sealing face engages the orifice plate, seals the orifices of the orifice plate and closes the valve, and an open position, in which the seal plate is displaced from the orifice plate to open the valve. The suspension is configured to flex and adjust an orientation of the sealing face relative to the orifice plate during movement of the seal plate from the open position to the closed position.

The MEMS actuator is formed by a body, which surrounds a cavity and by a deformable structure, which is suspended on the cavity and is formed by a movable portion and by a plurality of deformable elements. The deformable elements are arranged consecutively to each other, connect the movable portion to the body and are each subject to a deformation. The MEMS actuator further comprises at least one plurality of actuation structures, which are supported by the deformable elements and are configured to cause a translation of the movable portion greater than the deformation of each deformable element. The actuation structures each have a respective first piezoelectric region.

A servovalve has a pilot stage having a piezoelectric element actuating a pilot stage spool valve, which pilot stage spool valve comprises an output control fluid line to a main stage.

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.

A fluid system includes a fluid active region, a fluid channel, a convergence chamber and plural valves. The fluid active region includes at least one fluid-guiding unit enabled to transport fluid and the fluid is discharged out through an outlet aperture of the fluid active region. The fluid channel is in communication with the outlet aperture, and includes plural branch channels. The convergence chamber is in communication with the fluid channel. Each valve includes a base, a piezoelectric actuator and a linking bar. When the piezoelectric actuator is enabled, the carrier plate is driven to move, and the stopping part of the linking bar is correspondingly moved to selectively close or open an outlet of the base. Each valve is disposed in the corresponding branch channel, and the fluid is selectively transported through the branch channels under control of the on/off states of the valves disposed therein.