﻿ Explanation of Common Terms of Metal Bellows, bellows hose

# Explanation of Common Terms of Metal Bellows

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1. Waveform
It is the shape of the wave after hydroforming, and it is the most basic element of the metal bellows.
2.O.D
Outside diameter 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. Scaling
Stroke of metal bellows divided by free length of bellows
7. Vacuum
The degree of gas dilution in a vacuum state is usually expressed as “high vacuum” and “low vacuum”. A high degree of vacuum means that the degree of vacuum is “good”, and a low degree of vacuum means that the degree of vacuum is “bad”. Torr is usually used as a unit, and Pa has been used internationally as a unit in recent years. 1 Torr = 1/760 atm = 1 mm Hg = 133.322 Pa (or 1 Pa = 7.5 x 10-3 Torr)
8. Service life
The number of reciprocating movements of metal bellows under technical standards.
9. Stiffness
The force required for the metal bellows to produce unit displacement is the basis for calculating the elastic reasoning of the bellows.
10. Pressure
The force of the gas molecule acting on the unit area of ​​the container wall is represented by “P”.
11. Displacement
The length of the metal bellows allowed to move under the action of force. There are usually axial and radial points.
12. Fluid
The substance flowing through the cavity.
13. Flow
The amount of gas flowing through any cross section per unit time, the symbol is represented by “Q”, and the unit is Pa · L / s or Torr · L / s.
14. Conductance
Represents the ability of vacuum pipes to pass gas. The unit is liters per second (L / s). Under steady state, the pipe conductance is equal to the pipe flow divided by the pressure difference between the two ends of the pipe. The symbol is marked as “U”. U ＝ Q / (P2- P1)
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