V-Series vacuum pumps are available in 24 models with anodized aluminum bodies plus 12 cartridge models for integration into custom vacuum manifold systems.
EDCO single-stage pumps provide the instantaneous response common to air operated devices in addition to being compact, light and cost-effective. Rugged, all-metal construction will provide years of trouble-free service.
Our no-clog flow-through design is perfectly suited for packaging and other applications involving paper fibers or other debris that can be ingested into the vacuum system. Our optional straight-through silencer passes the exhaust directly to atmosphere after absorving high-frequency noise from the air stream. Many of our competitors use closed-end plastic exhaust mufflers where the exhaust is passed through a filter media that will accumulate debris eventually causing a loss of pump performance. In systems where conditions are very dirty, such as woodworking, a vacuum filter should be used to remove dust and debris so they will not be dispersed in the exhaust and breathed by workers.
As always, to obtain maximum benefit of EDCO compressed air powered vacuum pumps, they should be mounted close to the point of vacuum usage to minimize line losses, reduce vacuum system volume and minimize system evacuation time.
For ease of mounting, V-style pump bodies feature square or rectangular cross-sections and include mounting holes. A much simpler installation with better appearance will be the result of choosing an EDCO V pump over cylindrical body vacuum pumps.
Principle of Operation
To generate vacuum, compressed air is supplied to the inlet of a shaped primary nozle to concentrate the air stream so that it increases in velocity as it passes through the nozzle throat. As velocity increases, pressure decreases until it is below atmospheric pressure (vacuum) and the high-velocity air stream is passed into a second nozzle that is spaced away from the end of the primary nozzle. THe gap between the two nozzles occurs with a chamber with a threaded port for connecting to a system requiring a vacuum source. As evacuated air flows into the vacuum port, it is drawn into the second nozzle where it is mixed with the air from the primary nozzle and the combined flow is exhausted to atmosphere after passing through a silencer where expansion continues and noise is absorbed by an acoustic media.
To stop the vacuum, the compressed air supply is removed and vented by a 3-way supply valve. When air flow stops, vacuum is no longer generated and ambient air flows into the exhaust and into the vacuum line to dissipate the residual vacuum, thereby releasing work pieces from the vacuum cups or other vacuum holders in the system. Geometry of the primary and secondary nozzles determines the shape of the pump performance curve, depth of vacuum that can be achieved and air consumption at a particular supply pressure. Nozzles are optimized for operation at specific pressures but can be used at other supply pressures to suit an applicaiton. When operating at some non-optimum air pressures, a rapid popping noise bay be heard in the exhaust which is caused when air velocity achieves unstable, supersonic/subsonic velocity and can be eliminated by slightly increasing or reducing the air supply pressure.
There are many terms for these devices, including generator, ejector and venturi, but they are commonly called vacuum pumps in industry so that is the term we use. No matter what the name, they are very useful for providing a fast, reliable, compact and low-cost vacuum source for all manner of applications.