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Bellows Assembly | bellows core pack welded to adapters/end fittings
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Bellows Element/Core Pack | convolutions welded together
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Convolution | two diaphragms welded together at the ID
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Diaphragm | 'Blanked' metal disc with ripple(corrugation)/without
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Deflection / Stroke | movement through which a convolution is extended/compressed
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Effective Area | area of a bellows responding to a differential pressure resulting in an axial force
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Effective Diameter | an imaginary diameter used to define the effective area against which presure will act
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Mean Diameter | (O.D + I.D)/2
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Pitch | centreline to centreline dimension for adjacent O.D weld beads
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Span | radial width of diaphragm given by dividing the difference of the outer and inner diameters by two
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Spring Rate | the force required to deflect a bellows element a given distance(expressed in N/mm)
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