An oil suction pump contains: an oil storage cylinder, a pumping mechanism, and a cap. The pumping mechanism includes a body, a drive rod, a plug, and a pressure relief valve. The cap is disposed on the body and the oil storage cylinder, and the cap includes a connector. The drive rod has a press lever, the cap further includes a first air conduit, a first one-way valve assembly, and a second air conduit. The second air conduit has an inlet segment, an outlet opposite to the inlet segment, and a pump segment defined between the inlet segment and the outlet segment and communicating with the oil storage cylinder. The cap further includes a second one-way valve assembly accommodated in the oil storage cylinder and connected with the pump segment, and the second conduit accommodates a pressure reducing valve.

A multifunctional air extraction boosting pump includes an upper cover, two positioning rings mounted in the upper cover, a control valve mounted in the upper cover, an air inlet pipe connected with the upper cover, and a container connected with the upper cover. One of the positioning rings is initially mounted in the upper cover. Then, the control valve is mounted in the upper cover. Then, the other one of the positioning rings is mounted in the upper cover. Then, the air inlet pipe is mounted on the upper cover. Thus, the air extraction boosting pump is assembled easily and conveniently.

A multifunctional air extraction boosting pump includes an upper cover, two positioning rings mounted in the upper cover, a control valve mounted in the upper cover, an air inlet pipe connected with the upper cover, and a container connected with the upper cover. One of the positioning rings is initially mounted in the upper cover. Then, the control valve is mounted in the upper cover. Then, the other one of the positioning rings is mounted in the upper cover. Then, the air inlet pipe is mounted on the upper cover. Thus, the air extraction boosting pump is assembled easily and conveniently.

This invention disclosures a liquid storage tank upper cover assembly of a drawing or adding liquid machine and a drawing or adding liquid machine. The liquid storage tank upper cover assembly includes an upper cover, a switching valve foundation disposed at an upper end of the upper cover and a valve cartridge cooperated with the switching valve foundation. The upper cover and the switching valve foundation are a one-piece molded part. The switching valve foundation has a sliding hole, a lower part of the upper cover has a first through-hole and a second through-hole which are spaced apart, and the first through-hole and the second through-hole are both connected to the sliding hole. The switching valve foundation has a third through-hole connected with the sliding hole. The valve cartridge is glidingly provided in the sliding hole.

Embodiments described herein are generally directed to a venturi valve. The venture valve includes an inlet; an outlet opposite of the inlet; a passage, a primary orifice, and an insert. The passage is positioned between the inlet and the outlet and fluidly coupling the inlet to the outlet. The primary orifice is positioned between the inlet and the outlet and in fluid communication with the passage such that the primary orifice permits fluid to enter the passage. The insert is positioned between the inlet and the outlet, the insert configured to enclose at least a portion of the passage.

Embodiments described herein are generally directed to a venturi valve. The venture valve includes an inlet; an outlet opposite of the inlet; a passage, a primary orifice, and an insert. The passage is positioned between the inlet and the outlet and fluidly coupling the inlet to the outlet. The primary orifice is positioned between the inlet and the outlet and in fluid communication with the passage such that the primary orifice permits fluid to enter the passage. The insert is positioned between the inlet and the outlet, the insert configured to enclose at least a portion of the passage.

A vacuum airlift system for treating an aqueous effluent includes an upflow liquid portion, where the upflow liquid portion is configured to retain a fluid, and a fluid inlet, the fluid inlet being fluidly coupled with the upflow liquid portion, where the fluid inlet is positioned at about a bottom of the upflow liquid portion. The vacuum airlift system can also include a downflow liquid portion, where the downflow liquid portion is fluidly coupled with the upflow liquid portion, and a fluid outlet, the fluid outlet being fluidly coupled with the downflow liquid portion, where the fluid outlet is positioned at about a bottom of the downflow liquid portion. The vacuum airlift system can also include a photobioreactor fluidly coupled with the downflow liquid portion such that the fluid is configured to pass through the upflow liquid portion, into the downflow liquid portion, and into the photobioreactor.

Embodiments include a vacuum airlift system for treating an aqueous effluent including an upflow liquid column, where the upflow liquid column is configured to retain a fluid, a fluid inlet, the fluid inlet being fluidly coupled with the upflow liquid column, where the fluid inlet is positioned at about the bottom of the upflow liquid column, a downflow liquid column, a fluid outlet, the fluid outlet being fluidly coupled with the downflow liquid column, wherein the fluid outlet is positioned at about the bottom of the downflow liquid column, and a plurality of moving bed biofilm reactors, the plurality of moving bed biofilm reactors being positioned in the upflow liquid column or the downflow liquid column.

A multifunctional air extraction boosting pump includes an upper cover, two positioning rings mounted in the upper cover, a control valve mounted in the upper cover, an air inlet pipe connected with the upper cover, and a container connected with the upper cover. One of the positioning rings is initially mounted in the upper cover. Then, the control valve is mounted in the upper cover. Then, the other one of the positioning rings is mounted in the upper cover. Then, the air inlet pipe is mounted on the upper cover. Thus, the air extraction boosting pump is assembled easily and conveniently.

A pumping system includes a first chamber and a second chamber to receive filtered medium. The pumping system includes a first motor assembly and a second motor assembly operably coupled to the first chamber and the second chamber, respectively. The first motor assembly and the second motor assembly each includes a pair of vacuum motors arranged back-to-back so that one of the vacuum motors operates to generate a negative pressure force on the chamber and the other vacuum motor operates to generate a positive pressure force on the chamber. The first motor assembly and the second motor assembly work together to alternate between siphoning material having one or both a fluid and a solid into one of the chambers and ejecting siphoned debris from another chamber.