GT  
22.48
 (P1-P2)P2 

and list values for varying inlet gage pressures in the accompanying Basic Data table.

This reduces the flow-coefficient equation to Cv = QA. In terms of cylinder volume and time,

Q=
VP1
28.8tPa

where atmospheric pressure, Pa, is assumed to be 14.7 psi.

Next, calculate values for compression ratio, Cr = P1/Pa, for various inlet pressures and also list values in the Basic Data table.

Restating the volumetric flowrate equation in terms of compression ratio results in

Q=
VCr
28t

Now examine the impact of cylinder volume and stroke time for known Cv values of ISO valves. Given that Cv = QA; and V = (π/4)d2l, we can restate the equation as:

Cv=
( »

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