Page 106 - Pneumatic ebook (2)_draft 13 sept 2021

Sizing a Cylinder

1. Linear cylinders have the following standard diameters as recommended in ISO:

8, 10, 12, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125, 140, 160, 200, 250, 320 mm

2. The force developed by a cylinder is a function of the piston diameter, the operating air pressure and the frictional
resistance. This, theoretical force, is calculated using the formulae:

Force (N) = Cross section area of Piston area (m2) X air pressure (N/m2)

Extending stroke for a double acting cylinder: X efficiency where, D = piston diameter,
P = Working (gauge) pressure
g

Retracting stroke for a double acting cylinder: X efficiency where, d = piston rod diameter

For a single acting cylinder, extending stroke: X efficiency where, F = spring force at the end of
s
stroke

INTRODUCTION TO PNEUMATIC SYSTEM 48