A jet pump assembly is adapted to be releasably attached to a tubular member of a tubular string in an oil well. The jet pump may be pumped out of the tubular string to the surface by a reverse flow of power fluid down the well between the tubular string and the casing of the well. Consequently the jet pump may be serviced or reconfigured to a direct pumping mode without the necessity of a wire line or other apparatus. A sensor for measuring downhole parameters such as temperature and pressure etc. is positioned within a cavity located in a lower portion of the jet pump so as to be removable from the well with the pump.

A jet valve spool includes: a spool housing on which is provided with a cold water port and a hot water port; a spray nozzle arranged in the valve core shell and having a cold water inlet of the spray nozzle and a cold water outlet of the spray nozzle, with the cold water inlet and the cold water outlet being in communication with a cold water channel of a valve by means of the cold water opening; and a spray needle which can be assembled inside the spray nozzle, can form a cold water inflow space with an inner chamber of the spray nozzle, and form a cold water jetting outlet with the cold water outlet of the spray nozzle, wherein the position of the spray needle in the axial direction of the jet valve core is fixed, and the position of the spray nozzle in the axial direction of the jet valve core is adjustable.

An ejector and a refrigeration cycle apparatus having an ejector are provided. The ejector may include an ejector body having an accommodation space therein, a suction portion through which a high pressure refrigerant and a low pressure refrigerant may be suctioned into the accommodation space, and a mixing portion configured to mix the high pressure refrigerant with the low pressure refrigerant; a nozzle provided in the ejector body, having a nozzle neck and an expansion portion, and configured to inject the high pressure refrigerant into the mixing portion; a first needle moveably provided at the expansion portion, and configured to control a flow sectional area of the expansion portion; a second needle moveably provided at the nozzle neck, and configured to control a flow sectional area of the nozzle neck; a first needle drive configured to drive the first needle; and a second needle drive configured to drive the second needle. With such a configuration, the flow sectional area of the nozzle neck and the flow sectional area of the expansion portion may be independently controlled in correspondence to a drive condition.

The present disclosure generally relates to fuel cell systems and methods of sizing a venturi or ejector by using aby-pass valve for determining or controlling fuel flow through the venturi or ejector.

An aspirator system is disclosed comprising a collapsible/extendable aspirator air channel, wherein a burstable seal for entrapping air across the exit channel is provided, wherein said entrapped air creates a pressure causing the aspirator to extend to its extended state, whereupon the seal bursts and opens the air channel.

In an ejector, a passage formation member is disposed inside a body forming a space therein. Provided between an inner peripheral surface of the body and the passage formation member are a nozzle passage functioning as a nozzle, a mixing passage in which an ejection refrigerant ejected from the nozzle passage and a suction refrigerant drawn through a suction passage are mixed together, and a diffuser passage that converts a kinetic energy of the refrigerant that has flowed out of the mixing passage into a pressure energy. The mixing passage has a shape gradually reducing in cross-sectional area toward a downstream side in the refrigerant flow.

Disclosed are methods and devices useful for aerating and or adding additives to carbon-containing aqueous waste.

An ejector has a nozzle, a body, a passage defining member and a drive portion. The body has a refrigerant suction port and a pressure increasing portion. A nozzle passage is defined between an inner surface of the nozzle and an outer surface of the passage defining member and has a minimum sectional area portion, a tapered portion, and an expansion portion. The minimum sectional area portion has a smallest passage sectional area. The tapered portion is located upstream of the minimum sectional area portion in a refrigerant flow direction and has a passage sectional area decreasing toward the minimum sectional area portion gradually. The expansion portion is located downstream of the minimum sectional area portion in the refrigerant flow direction and has a passage sectional area increasing gradually. The passage defining member has a groove that is recessed to increase the passage sectional area of the nozzle passage.

An adjustable jet valve includes a valve body containing a cold water opening, a hot water opening and a mixed water opening for outputting mixed water; a spray nozzle arranged in the valve body includes a cold water inlet and a cold water outlet connected to a cold water channel of a valve by means of the cold water opening; a spray needle assembled inside the spray nozzle forms a cold water inflow space with an inner chamber of the spray nozzle, and forms a cold water spray outlet with the cold water outlet of the spray nozzle; and a throat pipe connected to the mixed water opening of the valve body for guiding the mixed water to flow into a device using mixed water.

An aspirator system is disclosed comprising a collapsible/extendable aspirator air channel, wherein a burstable seal for entrapping air across the exit channel is provided, wherein said entrapped air creates a pressure causing the aspirator to extend to its extended state, whereupon the seal bursts and opens the air channel.