Compressed Air Best Practices - September 2008 - (Page 55) Compressed Air Industry FOOD PACKAGING & PROCESSING | 09/08 | Venturi Vacuum Generators should generally be located as close to the actual process as possible. p An effective Venturi vacuum generator offers great flexibility in a decentralized system and when well-controlled With a decentralized system and Venturi vacuum generators mounted close to the suction cups, losses caused by long, small hoses, bends, fittings, valves, filters, etc., are eliminated When proper system design strategy is implemented, it will take advantage of the ability of the Venturi vacuum generator located near the process to react quickly and pull the required vacuum quickly; then shut off the supply to refill the vacuum Most of the newer Venturi vacuum generators are much less sensitive to varying inlet pressures p p p New Changes in Vacuum Generators Lending to Better Productivity and Lower Operating Cost: The multi-stage Venturi vacuum generator utilizes built-in flapper type valves to increase the avenues of evacuation and significantly reduce the evacuation time; therefore, possibly increasing the “cycle time.” Appropriately applied “multi-stage” design is reputed to reach the target vacuum up to twice as fast as similar sized single-stage units with the same or almost the same compressed air usage. If the cycle time can be economically increased, this can be a significant gain in production, but not necessarily any reduction in compressed air energy cost. Typical Multi-Stage Venturi Vacuum Generator www.airbestpractices.com 55 http://www.airbestpractices.com
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