## Cylinder Displacement

The calculation of the cylinder displacement is a straightforward geometric procedure. It is the product of three factors, namely, the piston area minus rod area (when appropriate), the stroke, and the number of strokes in a given time. There are four options, which can be covered by three equations.

For a single-acting cylinder compressing at the outer end of the cylinder _pj2

where

Pd = piston displacement

St = stroke

N = speed of the compressor

D = cylinder diameter

For a double-acting cylinder without a tail rod,

d = piston rod diameter

For a double-acting cylinder with a tail rod,

Pd = StxNx

For the application requiring a single-acting cylinder compressing on the frame end only, use Equation 3.3 deleting the 2 in the expression.

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