커피 장비


https://www.youtube.com/watch?v=1C3Do4j4Qvw (0.7mm jet)

https://www.youtube.com/watch?v=Q2cIoIhHyNQ (0.5mm jet) 

https://www.youtube.com/watch?v=pHXA9Yepw90 (sample extraction with a 0.5mm jet)



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11264_topdown.jpg


0.5mm, 0.7mm jet Photo From HB by Will







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269_orificeflow.jpg



What does your pump discharge pressure gage read during this measurement? 

As an FYI, the flow in liters/minute (Q) is equal to (3.785) times the flow coefficient (Cv) times the square root of the "delta P". 3.785 is just a conversion from gallons per minute to liters per minute. Delta P is 130.5 psi when you convert 9.0 bar to psi. Cv is 0.0230 for a 0.80 mm orifice; 0.0176 for 0.70 mm; 0.0126 for 0.60 mm; and 0.0087 for 0.50 mm. These Cv numbers came from here:http://www.okcc.com/Default.htm If you "plug & crank", it computes to 994 ml/minute. That's twice what I would like to see but I'm not very experienced with regards to varying this flow.


Flow with variable orifice - Photo From HB by Eric



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