Dimension :

Classify into two type :
Specificatioin :
They are main function of an elastic component indicators ,also used to determine the application of corrugated tube components important criterion. In addition to these parameters given a rating, they also have given a tolerance range (threshold value), to ensure the reliability of the use of elastic components .
Quality Dimension :
Not refer to this data when use metal expansion bellows ,only used when the exlasticity and quality test carry out ,to determine the function,quality,invalidity or well replialbe on the basis of the resuts.
Expansion and other elastic compenents dimension :
Loading,norminal loading or over loading :
Loading :
The loading rating on the bellows and other compenents , such as pressure F,pressuer P and momnet M etc . except for the loading rating , direction and location should be given ,for overloading,to make clear that to bear the pressure cavity or external cavity pressure.
Norminal Loading :
Max loading and full loading is allowed under normal working situaitioni ,it is commonly design ,special revised after actual inspection and test .
Overloading :
Specific flexible compenents under go overloading during instant time or testing ,no damage,invalid,unstable loading ,for the compenents of instrument ,normal overloading rate is 125% of normal working loading.the parts used in projects , normally limited to 150% of rated loading. accorind to project's safety requirement , compenents and parts could be overloading ,so the loading should be less than or equal to the rated loading.

Displacement :
Metal bellows and elastic components of a specific point (the free end or center position) changes. According to their track can be divided into linear displacement and angular displacement. In the external load, metal bellows may have axial displacement, angular and lateral displacement .
Rated Displacement:
Metal bellows and elastic components at rated loads arise the displacement, that is, they are allowed to produce under normal conditions .
Overload Displacement
Various types of elastic elements in operation or a trial period to allow more than the rated capacity of displacement. Displacement in the event of overload, flexibility component damage should not occur, failure, failure and so on. Flexible instrument for sensitive components, overload displacement displacement generally limited to 125% rated , should be based on work conditions and safety requirement.
Flexibility Character :
Elastic property known as metal bellows and other flexible components in a specified load relationship , the displacement and load components should be kept within the corrugated elastic tube ,can be elastic properties of components function equation, the form of tables and curves, The elastic properties depend on various elastic components of the structure and loading mode. Elastic properties of elements can be linear or non-linear, non-linear characteristics can be divided into increasing and decreasing characteristics .
Elastic property is one key indicator on expansion bellows and other flexible compenents,the compennents were used,In the design of the general always strive to make components and the measured output parameters (load) is linear relationship. This can drive a more simple amplification mechanism to achieve the attainment scale instrument .