SPRING FORCE S079
The force on the seal faces caused by the spring compression. Spring loading is typically 30 psi (2 kg/cm2) when the seal face is new and 10 psi (0.7 kg/cm2)when the face is worn away.
To calculate this load you must know the spring rate (pounds / inch or kg/cm), and the area (square inches or square centimeters) of the seal faces.
Springs are rated at pounds per inch (kg/cm) of compression. You divide the number of square inches (cm2 ) of seal face into this number and you get pounds per square inch (kg/ cm2).