Explanation of Common Terms for Metal Bellows


Wave shape
  1. It is the shape of the wave after hydroforming, and it is the most basic element constituting the metal bellows.
2.O.D
    Outer dimensions of metal bellows
3.I.D
    Inner diameter of metal bellows
4. Wave distance
    Distance between two waves
5. Itinerary
    Difference between free length and compressed length
6. Stretching amount
    Metal bellows stroke divided by bellows free length
7. Vacuum degree
    The degree of thinness of a gas under vacuum is usually expressed by "high vacuum" and "low vacuum". A high vacuum degree means that the vacuum degree is "good", and a low vacuum degree means that the vacuum degree is "poor". Torr is usually used as the unit. In recent years, internationally, Pa has been used as the unit. 1 Torr = 1/760 atm = 1 mmHg = 133.322 Pa (or 1 Pa = 7.5 x 10-3 Torr)
8. Service life
    Number of reciprocating motions of metal bellows under technical standards.
9. Stiffness
    The force required to make the metal bellows produce a unit displacement is the basis for calculating the elastic reasoning of the bellows.
10. Stress
    The force of a gas molecule acting on a unit area of ​​the container wall is represented by "P".
11. Displacement
    The length of metal bellows allowed to move under the action of force. Usually there are axial and radial points.
12. Fluid
    The substance flowing through the cavity.
13. Flow
    The amount of gas flowing through an arbitrary cross section per unit time, the symbol is represented by "Q", and the unit is Pa · L / s or Torr · L / s.
14. Conduction
    Represents the ability of a vacuum pipe to pass gas. The unit is liters per second (L / s). Under steady state, the pipeline conductance is equal to the pipeline flow divided by the pressure difference across the pipeline. The symbol is written as "U". U = Q / (P2- P1)



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