Measuring the trust:
The Trust of spring is measured with a special dynamometer at a room temperature of approx. 20 C
with the rod compressed by about 10 mm and free from friction by the seal. The measurement is given in kg and is
a " static" value normally referred to when defining the characteristics of a spring.
lt can be calculaletd
F1(Newton)= Lifted Weight(kg)x9,8 or 10N=98kg.
Other components interact with this basic value and become especially noticable in the "dynamic" phase of
the spring. We are referring in particular to the friction produced by seals and rod supporting guides. The resistance
exerted by such friction acts in the opposite direction to the rod movement.it has value of approx. 2/3 above-mentioned "static" thrust.The closing force is indicated in the graph by FO and the opening force by F1.
It can be seen that FO and F1 are higher and lower respectively than theaverage line which identifiesthe "static" thrust