A peristaltic pump dampener apparatus includes a first chamber and a second chamber separated by a flexible diaphragm. The first chamber of the peristaltic pulse dampener apparatus receives a first input flow tangent to the walls of the first chamber, and the second chamber of the peristaltic pulse dampener apparatus receives a second input flow tangent to the walls of the second chamber. The flexible diaphragm of the peristaltic pulse dampener apparatus acts to equalize the pressure between the first chamber and the second chamber so as to generate two substantially even, constant output flows.

Multiple diaphragm pumps are known in the art that are operated by compressed air and in which the valves are controlled by a slide element. The slide element is magnetically actuated without mechanical engagement involved in the actuation. This has the consequence that only a small amount of force can be applied which may not be sufficient due to static friction of the valve seal. The invention presents a hybrid solution which facilitates a mechanical actuation of a valve piston provided for valve control as well as a magnetic overcoming of a dead center that may be reached by the valve piston and the diaphragm piston that actuates the diaphragms of the multiple diaphragm pump.

A pump includes a vibrating plate, a flow path forming member, a pump chamber, and a film valve. The vibrating plate is provided with a piezoelectric element, vibrates due to distortion of the piezoelectric element, and has a gap on an outer periphery. The flow path forming member is disposed so as to face the vibrating plate, and has a hole in a portion facing the vibrating plate. The pump chamber is surrounded by the vibrating plate and the flow path forming member, and has a central space communicating with the hole and an outer edge space communicating with the gap. The film valve is disposed in the pump chamber. The film valve is in contact with the vibrating plate and the flow path forming member when a pressure in the central space is lower than a pressure in the outer edge space.

A power cable can include a conductor; an insulation layer disposed about the conductor where the insulation layer includes a first polymeric material; and a shield layer disposed about the insulation layer where the shield layer includes a second polymeric material where a solubility parameter of the first polymeric material is less than a solubility parameter of the second polymeric material.

A diaphragm type fuel pump includes a rod, one end of which is coupled to a diaphragm, a plunger which is slidably fitted with respect to the other end of the rod, and a plunger biasing member which biases the plunger toward the other end of the rod. The other end of the rod has a first pin extending outward radially. A through hole extends through the plunger in a radial direction. The through hole has a size which allows the first pin to move in a longitudinal direction of the rod. The first pin is in contact with one edge of the through hole. A gap is formed between another edge of the through hole and another end surface of the rod. A second pin in parallel to the first pin can be fitted into the gap.

Disclosed is a valve-less micro pump configuration that includes plural micro pump elements, each including a pump body having a compartmentalized pump chamber, with plural unobstructed inlet ports and outlet ports and a plurality of membranes disposed in the pump chamber to provide compartments. The membranes are anchored between opposing walls of the pump body and carry electrodes disposed on opposing surfaces of the membranes and walls of the pump body.

A description is given of a pump comprising a suction space which is at least partly bounded by a flexible body and which is located between end elements at least one of which can be driven so as to move in a reciprocating manner, a delivery space which surrounds the suction space and around which a housing is provided, and valves provided in the housing and in at least one of the end elements, the valves being constructed such that when the volume of the suction space is increased, a medium is sucked into said suction space, which, when the volume is reduced, flows through one of the valves to the delivery space from which it is expelled when the volume of the delivery space is reduced.

A device includes a pump body that has at least one variable-size compartment. The pump body is configured to be actuated to change the size of the at least one variable-size compartment. Flexible bladders are disposed in the at least one compartment. At least one common port is fluidly connected with interiors of the flexible bladders. The change in the size of the at least one variable-size compartment either compresses or expands the flexible bladders in unison and thereby, respectively, either expels the interiors through the at least one common port or draws a vacuum into the interiors through the at least one common port.

In a bellows pump, detecting any leakage with respect to the bellows can be important, for example for pump durability and life. Disclosed embodiments relate to a bellows pump system in which the bellows is configured to form an annulus, such that fluid in the annulus may be monitored in order to detect leakage. For example, a double-walled bellows may include an annulus between the walls, and the annulus may be in fluid communication with a port. Detection of fluid at the port may be indicative of leakage, and one or more action may be taken in response to such fluid detection. In some embodiments, the double-walled bellows may be formed by having an elastomeric liner disposed within a single-walled bellows, which may have an accordion-like configuration. Related methods and systems are also disclosed.

A pump is provided with a pump housing, a vibrating portion, a driving portion, and a displacement regulating portion. The pump housing internally has a pump chamber. The vibrating portion is supported against the pump housing in the pump chamber and divides the pump chamber into a first pump chamber and a second pump chamber. The driving portion drives the vibrating portion so as to bend and vibrate the vibrating portion in a predetermined direction. The displacement regulating portion is positioned to prevent displacement of the vibrating portion that results in plastic deformation.