Terminology
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Bellows Specific
Bellows Applications
| TERM | DESCRIPTION |
| Bellows Assembly | bellows core pack welded to adapters/end fittings |
| Bellows Element/Core Pack | convolutions welded together |
| Convolution | two diaphragms welded together at the ID |
| Diaphragm | Blanked' metal disc with ripple(corrugation) / or without (flat diaphragm) |
| Deflection / Stroke | movement through which a convolution is extended/compressed |
| Effective Area | area of a bellows responding to a differential pressure resulting in an axial force |
| Effective Diameter | an imaginary diameter used to define the effective area against which presure will act |
| Mean Diameter | (O.D + I.D)/2 |
| Pitch | centreline to centreline dimension for adjacent O.D weld beads |
| Span | radial width of diaphragm given by dividing the difference of the outer and inner diameters by two |
| Spring Rate | the force required to deflect a bellows element a given distance(expressed in N/mm) |
| TERM | DESCRIPTION |
| Pressure Sensing, Null | converts a small change in pressure to a force that can operate a switch where linear force output with pressure is most desirable |
| Pressure Sensing, Actuator | general applications, where a long and linear stroke with pressure is required |
| Mechanical Seals | the bellows is used to seal the stationary or rotating face of a radial shaft seal, where short oprating lengths and low spring rates are required |
| Valve Stem Seal | requiring good pressure and movement capability |
| Reciprocating Shaft Seals | where long stroke and high cycle life has to be considered, ideal for the Nested type bellows design |
| Expansion Joints/Flexible Connectors | requiring good pressure capability combined with a high degree of flexibility. Generally used in vacuum systems where lateral offsets and/or angulation is required, coupled with low axial stiffness to reduce reaction forces |
| Dampers / Volumetric Compensators | bellows acts as a flexible membrane in a system seperating gases / fluids, to accomodate large changes in volume due to temperature effects |
Copyright © 2009 Palatine Precision Ltd
PALATINE PRECISION Ltd.
PALATINE PRECISION Ltd.
Tel : +44 (0)1634 684571
Fax :+44 (0)1634 200836
Hi-Performance Stainless Steel Edge Welded Bellows
