A plunger pump includes a pump head assembly, which includes: a pump head body, a chamber in the pump head body; a liquid suction valve assembly, a liquid discharge valve assembly, and a separation sleeve for separating the liquid suction valve assembly from the liquid discharge valve assembly that are located in the chamber. The chamber includes: a liquid suction valve base mounting portion for mounting the liquid suction valve assembly, a separation sleeve mounting portion for mounting the separation sleeve, a liquid discharge valve base mounting portion for mounting the liquid discharge valve assembly, and a liquid suction chamber on a lower side of the liquid suction valve base mounting portion and in communication with an emulsion supply device by a pipeline.

A low-force, non-displacement, micro/miniature valve and/or pump assembly is provided. A tube component having a first side port coupled to an inlet portion and a second side port coupled to an outlet portion can be selectively moved to alternatively couple the side ports to a first or second piston pump chamber. First and second pistons can be actuated after positioning the tube component to either draw in fluid or push out fluid from either the first or second piston pump chambers during each actuation of the pistons. The fluid can be drawn in from a reservoir and can be expelled to a patient for providing a dose of the fluid to the patient.

An air sampling pump includes a reciprocating piston for operating a diaphragm assembly. The diaphragm includes a valve head including a fluid inlet and a fluid outlet and a fluid chamber defining a fluid path between the inlet and outlet. A diaphragm sealing engages the valve head and encloses the fluid chamber. The diaphragm includes a piston diaphragm membrane portion coupled to the piston for reciprocating with the piston and reciprocation of the piston causes a change in air pressure within the fluid chamber to cause air to move from the fluid inlet toward the fluid outlet. The diaphragm includes a damper membrane portion, which cooperate to reduce an amplitude of pulsation in the airflow at the fluid inlet and fluid outlet.

A low-force, non-displacement, micro/miniature valve and/or pump assembly is provided. A tube component having a first side port coupled to an inlet portion and a second side port coupled to an outlet portion can be selectively moved to alternatively couple the side ports to a first or second piston pump chamber. First and second pistons can be actuated after positioning the tube component to either draw in fluid or push out fluid from either the first or second piston pump chambers during each actuation of the pistons. The fluid can be drawn in from a reservoir and can be expelled to a patient for providing a dose of the fluid to the patient.

A high pressure reciprocating pump (10) for high fluid pressures having a valve cartridge (57) positioned within a manifold block (15) of the pump (10). The valve cartridge (57) has a fixed body (58) with a plurality of equally spaced suction opening (69) extending therethrough. A central bore (70) of the valve cartridge body (58) has a valve assembly (72) mounted therein. Valve assembly (72) include a discharge valve member (74) and a two-piece suction valve member (280) mounted for sliding movement about the outer surface of discharge valve member (74). A spring (84) biased between spring retainer (87) and the two-piece suction valve member (280) continuously urges the valve members (74, 280) toward closed position. On the suction stroke, the two piece suction valve member (280) is opened and fluid through suction openings (69) enters the pump chamber (37). On the discharge stroke, high pressure fluid is discharged through the central bore (77) and lateral slots (79) of open discharge valve member (74) past seat (78). The two-piece suction valve 280 includes a spring seat 282 and a hard sealing member 284.

An automatic double-acting valve includes: a valve body, a central duct, passing through the valve body and is equipped with a first opening made in a first end of the valve body and a second opening made in an opposite second end, a peripheral duct made in the valve body, eccentric to the central duct and equipped with a first opening, in a side surface between the first end and the second end, and a second opening in the second end of the valve body, a first blocking body movable at least between a closed position, in which it obstructs the first opening of the central duct, and an open position, a first elastic element configured to generate a force adapted to keep the first blocking body closed, a second blocking body movable at least between a closed position, in which it obstructs the second opening, and an open position.

A medical fluid pumping system includes a medical fluid pump for pumping a process fluid, the medical fluid pump including a first pump chamber, a first inlet valve chamber including a first inlet valve diaphragm, a first outlet valve chamber, a second pump chamber, a second inlet valve chamber including a second inlet valve diaphragm, and a second outlet valve chamber; and a medical fluid chassis operable with the medical fluid pump, the medical fluid chassis including a motive fluid source providing motive fluid at a motive fluid pressure, and wherein the first and second inlet valve diaphragms are configured to actuate from an open to a closed position at a pressure less than the motive fluid pressure to mitigate process fluid backflow through the first and second inlet valves.

The present disclosure generally relates to a pumping element of a fuel pump for an internal combustion engine wherein the pumping element comprises a pumping chamber and a check valve assembly having a first insert including an angled passage in flow communication with a fuel outlet, and a second insert being disposed adjacent the pumping chamber, the second insert including a central bore in flow communication with a fuel inlet, a plurality of through holes in flow communication with the pumping chamber.

An air sampling pump includes a reciprocating piston for operating a diaphragm assembly. The diaphragm includes a valve head including a fluid inlet and a fluid outlet and a fluid chamber defining a fluid path between the inlet and outlet. A diaphragm sealing engages the valve head and encloses the fluid chamber. The diaphragm includes a piston diaphragm membrane portion coupled to the piston for reciprocating with the piston and reciprocation of the piston causes a change in air pressure within the fluid chamber to cause air to move from the fluid inlet toward the fluid outlet. The diaphragm includes a damper membrane portion, which cooperate to reduce an amplitude of pulsation in the airflow at the fluid inlet and fluid outlet.

A blood treatment system includes (i) a blood pump including a first blood pump chamber operable with a first inlet valve and a first outlet valve, and a second blood pump chamber operable with a second inlet valve and a second outlet valve; (ii) an arterial blood line; (iii) a dialyzer placed in fluid communication with the arterial blood line, wherein the blood pump is provided along the arterial blood line upstream of the dialyzer; and (iv) a venous blood line extending downstream from the dialyzer. The system also includes a processor configured to sequence the first and second blood pump chambers so as to achieve a pulsatile pattern of filling the first and second blood pump chambers and an at least substantially constant pattern of discharging blood from the first and second blood pump chambers to the dialyzer.