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AVAILABLE FORCES
Forces developed by the cylinders are determined by multiplying the applied air pressure by
the exposed piston area, less the spring force.
Pounds of force = applied pressure (psi) x piston area minus
pounds of spring force.
The accompanying graph shows pressure in psi required to overcome the force of the spring
as the piston rod is retracted or extended from its center position. Opposing spring force in-
creases as the stroke length of the piston rod increases and the spring is further compressed.
From the graph, pounds of spring force can be determined by multiplying the pressure (psi) by
the piston area. Thus, the initial force of the cylinder at zero stroke in the center position is:
Part Number R431004052 (P -057378-00312), R431006294 (P -063522-01000),
P -066824-01000 & R431004943 (P -059211-00000)
Pounds of force (retracted stroke) = applied pressure (psi) x 2.2 inches (56 mm)
minus 18 psi x 2.4 inches (1.2 bar x 61 mm)
Pounds of force (extended stroke) = applied pressure (psi) x 2.4 inches (61 mm)
minus 18 psi x 2.4 inches (1.2 bar x 61 mm)
For spring force at subsequent piston rod positions on either retracted or extended stroke, pro-
ject across the graph from the appropriate stroke length point on the vertical line until the pres-
sure line is intersected. Project down from this point to arrive at pressure in psi. Multiply this
figure by the 2.4 inches (61 mm) of piston area.
PRESSURE PSI
PISTON AREA:
EXTENDED 2.4
RETRACTED 2.2
S
T
RO
K
E
-
INCH
E
S
R431004052 (P -057378-000312), R431006294 (P -063522-
01000), P -066824-01000, R431004943 (P -0589211-00000)
Summary of Contents for R431004052
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