Eaton 145406 Installation, Operation And Maintenance Manual

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specifications

QRV 9100 (PDF FORMAT) 2 © Copyright Eaton Corp. 2006, All Rights reserved.1.0 INTRODUCTIONThroughout this manual there are a number ofHAZARD WARNINGS that must be read andadhered to in order to prevent possible personalinjury and/or damage to equipment. Three sig-nal words “DANGER”, “WARNING” and“CAUTION” are used to indicate the severity ofa hazard, and are preceded by the safety alertsymbolDenotes the most serious hazard, and isused when serious injury or death WILLresult from misuse or failure to follow spe-cific instructions.Used when serious injury or death MAYresult from misuse or failure to follow spe-cific instructions.Used when injury or product/equipmentdamage may result from misuse or failure tofollow specific instructions.It is the responsibility and duty of all personnelinvolved in the installation, operation and main-tenance of the equipment on which this deviceis used to fully understand the:procedures by which hazards can be avoided.1.1 DescriptionThe Airflex® QRV is a quick release valve thatfacilitates the release of air from a pressurizedchamber i.e., air cylinders, clutches, brakes orother pneumatic devices. In essence it providesan exhaust port at the chamber rather thanexhausting through long supply lines and con-trol components. The function they perform isespecially important in high speed cyclingequipment. They prevent sluggish operation,overlap and excessive wear. Their importancein an air control system cannot be overempha-sized.QRV’s are available in four sizes for direct con-nection to 3/8, 1/2, 3/4 and 1 inch pipe. Modelsare also available which permit 1/2, 5/8 and 3/4inch outside diameter tubing connections to theQRV inlet port.Exhaust noise from the valve can be reducedby using a muffler, which threads into thetapped hole in the end cap.1.2 How It WorksFigure 2The Airflex QRV contains a diaphragmdesigned to function on a pressure differential.Air pressure at the valve inlet seats the dia-phragm on the end cap, closing the exhaustport. Applied pressure, acting on the outerunsupported diaphragm area, deflects it andallows air to flow to the cylinder port. See Fig-ure 2.When a pressure drop occurs in the air supply,the pressure differential lifts the diaphragm fromthe exhaust port and seats it on the inlet port.Air from the pressurized device can now flowfreely to atmosphere through the valve’sexhaust port.If the cylinder pressure falls below the inletpressure, the pressure differential on the dia-phragm will close the exhaust port, preventingfurther exhaust.