Transcription of Catalog 11 pg. - okcc.com
1 BOX Q TRUMBULL, CT 06611 CT PHONE (203) 261-6711 TOLL FREE PHONE (800) 533-3285 FAX (203) 261-8331 O'KEEFE CONTROLS CO. 2003 ALL RIGHTS RESERVED e-mail website OrificesWATER OR AIR FLOWAir FlowFor flow standards or other critical uses,O'Keefe Controls Co. can provide measuredair flow data for any of the standard preci-sion orifice products. This optional serviceis available at a nominal charge and can beprovided for pressure or vacuum flow con-ditions in the standard ranges listed calibration sheet with measured data isprovided for each orifice (see sample below).
2 Data is obtained using a digital mass flow-meter traceable to the National Institute ofStandards Technology (NIST). Standardconditions are 70 F and psia(See photo page 45).Air flow can be measured for any of thefollowing conditions:Pressure0-5, 0-10, 0-20, 0-50, 0-100 psigVacuum0-30" , , , , , , , 0-1, 0-2, 0-5,0-10, 0-20, 0-50, 0-200 , , , , , , 0-1, 0-2, 0-4, 0-10,0-20, 0-40, 0-100, 0-400 SCFHW ater FlowCalibration of standard orifices using wa-ter flow is accomplished by measuring thequantity of water flowing through an ori-fice in a given time period at a specific in-let calibration procedure determines thewater flow rate through the orifice and thecorresponding Cv of the orifice is calcu-lated.
3 The Cv can then be used to predictthe water flow rate at varying differentialpressure conditions using the equation:Q = Cv PFor liquids other than water flow rate canalso be predicted using the Cv method. Seepage 47 for details on liquid flow - calibration sheet with measured data isprovided for each orifice. The calculated Cvis the average value computed from fiveseparate tests (see sample below).Cv MeasurementWater at a constant height equivalent to 1 psig isused to determine the amount of water that passesthrough a test orifice in a measured time Cv is calculated from the measured
