A piezoelectric pump includes a leaf spring including a disc portion defining an actuator, an outer frame portion defining a housing, and an elastic support portion. The actuator flexurally vibrates from a center portion of a principal surface thereof to an outer periphery thereof. The elastic support portion includes a beam portion and connection portions and elastically supports the disc portion on the outer frame portion. The beam portion extends in a gap between the disc portion and the outer frame portion in a direction along an outer periphery of the disc portion. A first of the connection portions connects the beam portion to the disc portion. Second and third connection portions are offset from the first connection portion and connect the beam portion to the outer frame portion.

The present invention relates to an undulating-membrane fluid circulator having an intake port (3), a pump housing (4) delimiting a propulsion chamber (5), a discharge port (6), and an undulating membrane (2) paired with a drive means permitting an undulating movement of the membrane (2) between the upstream (8) and downstream (9) edges thereof, the undulating membrane (2) being capable of moving a fluid towards the discharge port (6). According to the invention, the circulator further comprises at least one means (7) for guiding the fluid, said means being disposed in the fluid propulsion chamber (5) near one of the edges (8, 9) of the QI undulating membrane (2) and making it possible to channel the fluid flow in a direction substantially parallel to the displacement of the wave along the membrane (2).

A volumetric pump, comprising: at least one deformable enclosure, which defines at least one variable-volume chamber, each of the at least one chamber being provided with an intake passage and with an outflow passage, magnetically-actuated elements, which act on portions of the deformable closure in order to deform the deformable enclosure between an extended configuration, having a larger volume, and a compressed configuration, having a smaller volume, drive elements for the actuation of the magnetically-actuated elements, a load-bearing frame on which the at least one deformable enclosure and the drive elements are mounted.

The present disclosure includes: a vibrating plate having a piezoelectric body connected to a main surface thereof; a cover including a top plate that faces another main surface of the vibrating plate and that has an opening part, and a side wall connected to an outer peripheral portion of the top plate so as to surround a space between the top plate and the vibrating plate; a support portion connected to the side wall and supports an outer periphery of the vibrating plate; an opening between the side wall and the vibrating plate; and a protrusion on any one out of the top plate, the side wall, and the vibrating plate so as to protrude into the space. The protrusion is provided between the opening part of the top plate and the side wall in a cross section.

A pump in which fluid is fed out through piping by compression and vacuum in a compression chamber due to linear reciprocating motion of a drive part, so as to provide a low-noise product and an energy-efficient pump. The pump has a suction port, compression chamber, outlet port, drive source having a rotating shaft; a rotating part having a central portion connected to the rotating shaft and having at least one pair of rotating-side magnets of different magnetic poles arranged in a circumferential direction; and a drive part including a pair of linear-motion-side magnets of different magnetic poles wherein the pair of linear-motion-side magnets is arranged so as to correspond to the pair of magnets, and the drive part is mounted to be able to move towards or away from the rotating part and able to perform linear reciprocating motion within the compression chamber by suction force or repulsive force between the rotating-side magnets and the liner-motion-side magnets.

A high pressure pump is disclosed. The high pressure pump comprises a compression chamber having an inlet for connecting to a fluid supply to intake a fluid, and an outlet, an inlet check valve between the compression chamber and the inlet, a digital inlet valve between the compression chamber and the inlet check valve, a variable volume chamber connected to the compression chamber through a manifold and the digital inlet valve, and a plunger or piston configured to compress the fluid in the compression chamber and the variable volume chamber.

The present invention concerns a dosing pump comprising a dosing chamber, a working chamber and a dosing diaphragm, wherein the dosing chamber and the working chamber are separated from each other by the dosing diaphragm, wherein there is provided a device for reciprocating movement of the dosing diaphragm between a first position and a second position, wherein the volume of the dosing chamber is smaller in the first position than in the second position. To provide a dosing pump, the dosing diaphragm of which has an increased service life and which as far as possible can be hydraulically operated even at very low dosing fluid pressures at the suction side it is proposed according to the invention that there is provided a prestressing device which prestresses the dosing diaphragm in the direction of the first or second position.

Liquid pumps and related systems and methods are generally described.

A dense phase pump has two housings that are attached together using a single releasable fastener. The fastener can be released to allow the two housings to be separated thereby providing access to replaceable components. The replaceable components may include one or more pinch valves or one or more barrier elements. A pinch valve for a dense phase pump has a shape or profile for aligning the pinch valve when the pinch valve is installed in a pinch valve body. The pinch valve optionally has two end flanges, with each end flange having a shaped periphery. The two end flanges may have the same size and shape so that the pinch valve can be installed in either of two orientations that are inverse. A dense phase pump has a pump chamber that can be purged by purge gas that enters the pump off-axis from a purge path axis.

A fully-draining check valve with a mushroom assembly having a tapered back edge and a drain line disposed with the lower rim of the drain line below the tapered back edge to ensure no fluid becomes trapped in the check valve when not in use. Additionally, a fully-draining diaphragm pump is disclosed having a drain line configured to drain the lowest point of a product chamber to ensure no fluid becomes trapped in the diaphragm pump when not in use. A method of cleaning a fully-draining diaphragm pump and fully-draining check valve assembly is further disclosed comprising inducing turbulent flow of water, wash solution, and/or sanitizer through the assembly and opening ball valves the drain lines of the fully-draining check valves to vent the assembly.