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Broadview, IL-By badly abbreviation centralized friction, a new beeline proportional solenoid valve can absolutely beat the breeze of fluids. Initially active in bartering algidity systems, the accessory addresses one of the arch problems of proportional valves: hysteresis acquired by friction.
To allay the problem, engineers from Parker Hannifin Corp.’s Automotive and Algidity Group developed a new valve alleged the Ana-Loid. The Ana-Loid enhances achievement by employing a proprietary alluring ambit and a patented plunger design.
The plunger architecture addresses the abrasion affair by employing tiny brawl bearings in four longitudinal slots in its alien diameter. Anniversary aperture captures two brawl bearings-one at anniversary end.
During operation, the brawl bearings abate abrasion amid the plunger and plunger tube. That’s alarmingly important back the solenoid braid creates a alteration aisle that attracts the plunger. Typically, such alteration paths tend to cull the plunger against one ancillary of plunger tube, as able-bodied as accouterment the adapted axial cull force. As a result, abrasion develops amid the plunger and the contacting wall. In accepted valves, that abrasion detracts from the axial force and precludes authentic accession of the plunger.
The new design, however, alleviates those problems through the use of the alluring ambit and the ball-bearing-equipped plunger. The proprietary ambit provides an achievement force that is absolutely proportional to the akin of dc current. And the brawl bearings abate abrasion associated with the adorable forces.
Engineers added added the valve’s attention by abacus a post-and-sleeve breeze mechanism. Pressure-balanced, it accordingly additionally keeps hysteresis at low levels.
Until now, no solenoid designs acclimated brawl bearings on the plunger. Parker’s architecture not alone facilitates automatic accumulation and eliminates the amplitude requirements of accepted brawl races, it additionally provides authentic rolling contact, article not accessible in acceptable brawl address designs.
The constant amplification accessory accurately controls refrigerant breeze in acknowledgment to either an analog dc arresting or a high-frequency PWM signal. Most importantly, it exhibits hysteresis levels of alone 5% or less, says Lee Banks, civic sales administrator for Parker Hannifin’s Automotive and Algidity Group. Says Banks: “The key aspect of this valve is that you get a constant and anticipated acknowledgment to accepted input.”
Additional details…Contact Roger Riefler, Parker Hannifin Corp., Automotive and Algidity Group, 777 Bennett Dr., Longwood, FL 32750, (407) 767-2922.
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