| Geometrical stability | ||
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Every component changes its shape under the influence of pressure and temperature. The seal face and stationary seat of a mechanical seal must display sufficiently high geometrical stability for the inevitable warpings of its sliding faces (c sealing gap forms) not to exceed the tolerable magnitude. Geometrical stability can be increased considerably by selecting suitable materials (modulus of elasticity, coefficient of expansion, thermal conductivity), by taking certain measures in the design (cf. stationary seat balancing) and by employing modern methods of calculation. Illustrated in the following figure is a high-duty mechanical seal with decoupled and hydraulically balanced seal face and stationary seat as well as radial support rings (support ring), whose geometrical stability has been optimized by means of finite element analysis. |
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