(d2)
28.8(25.4)3
t

Assuming 80 psig for inlet pressure — based on a typical plant operating at 100 psig with line losses — and using a conservative 5-psi pressure drop for the constant A, chart average cylinder rod speed versus cylinder diameter in terms of required Cv. The accompanying tables for two and threeposition valves highlight areas where each ISO valve meets Cv requirements.

Nomenclature
d = Cylinder diameter, in.
G = Specific gravity of the fluid (G = 1 for air)
l = Cylinder length, in.
P1= Absolute pressure at inlet port (gage pressure + 14.7), psi
P2 = Absolute pressure at outlet port, psi
Pa = Atmospheric pressure, psi
Q = Volumetric flow rate, scfm
T = Absolute temperature of air, °R
t = Time to fill cylinder, sec
V = Cylinder volume, in.3

 

Parker’s Isysnet Field Bus System includes a valve drive module that controls up to 32 solenoids; I/O modules with up to 256 inputs and 256 outputs; and communications modules using EtherNet/IP, ControlNet, DeviceNet, and Profibus DP. The plug-in pneumatic valves meet ISO 15407 and 5599 dimensional and electrical standards.

 

These tables chart flow requirements based on cylinder size and average rod speed. The large table highlights two position ISO valves that meet the needed Cv.

These tables chart flow requirements based on cylinder size and average rod speed. The large table highlights two position ISO valves that meet the needed Cv.

 

These tables chart flow requirements based on cylinder size and average rod speed. The large table highlights two position ISO valves that meet the needed Cv.

These tables chart flow requirements based on cylinder size and average rod speed. The large table highlights two position ISO valves that meet the needed Cv.

 

The tables lists compression ratios, P1/Pa, as well values for the constant A, for a range of inlet pressures and pressure drops.

The tables lists compression ratios, P1/Pa, as well values for the constant A, for a range of inlet pressures and pressure drops.