The ratio p d / p s is the compression ratio of a jet ejector. The increase from suction pressure ps to discharge pressure p d corresponds to the delivery head for the suction flow or to the pressure difference of the jet ejector. Motive flow and suction flow pass together - as a mixture - through the diffuser, loosing velocity and Part of the kinetic energy is transferred to the suction flow. At this point the suction flow enters into the ejector head (3) through the suction connection B and is mixed with the motive fluid flowing with high velocity. The section between motive nozzle (2) and diffuser (4 + 5) has the lowest static pressure, approximately equivalent to the suction pressure p s. Conversely, the flow is decelerated in the diffuser (4 + 5) while its pressure increases to the discharge pressure at the outlet of the jet ejector. The pressure in the motive nozzle (2) decreases and the velocity rises. The flow section will change along this path. The motive fluid passes successively through these two components. The function depends, above all, on the design of the motive nozzle (2) and of the diffuser (4 + 5). The application determines the design of the flow section.Ī steam jet ejector is illustrated below as example (steam serves as motive fluid to create vacuum). This basic principle applies to every jet ejector in different models and ranges of application. A jet ejector requires no mechanical drive and has no moving parts. The term jet ejector describes a device in which a pumping effect is achieved using a motive fluid. Jet pumps for de-acidification of potable water.Jet pumps for pressurised dissolved air flotation.Waste gas cleaning and environmental technology.non-metallic vacuum systems (Graphite, PTFE).process-vapour operated ejectors with surface condensers.vacuum systems with vertical surface condensers.vacuum systems with surface condenser for non-barometric installation.vacuum systems with surface condenser and liquid ring vacuum pumps.controllable vacuum systems with surface condensers.Multi-stage steam jet vacuum systems with surface condensers.vacuum systems with process-vapour operated ejectors.vacuum systems with mixing condensers in closed alkaline loop (cooling water operation).vacuum systems with mixing condensers in closed alkaline loop (chilled water operation).vacuum systems with mixing condensers for non-barometric installation.vacuum systems with mixing condensers and liquid ring pump.controllable vacuum systems with mixing condensers.
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