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Valve Jobs Done Right. A close-up of a Honda CB750 SOHC valve seat. Though the upper 30 degree and the lower 60 degree shapes have been rough cut using Neway cutters, the 45 degree cut in the middle, the one that counts because it is the actual sealing surface, has the benefit of a stoned surface, the best possible with hand tools. Ah, valve jobs.
Aortic valves open and 90 on pressure, ventricular ejection, aortic valve closes at 120 on y axis, straight line down from 120 is isovolumic relaxtion, mitral valve open -draw a line from topmost dot to the y axis (you get 120) then get the secondmost top point, and draw over to y axis (get 80) BP=120/80.