In recent years, the disc spring preload technology flange Hermetic Sealing leaks in the governance achieved good results.
1, disc spring preload principles and performance:
Bolt preload relaxation for this problem, you can install the flange bolts on both sides of an elastic mechanical components - disc spring preload.
Disc spring preload of special material, by accurately determining the calculated shape of the structure, can be deformed in a small preload to provide a sufficient load, thus effectively reducing the risk of seal failure.
2, the flange seal leakage Analysis:
Many factors affect the flange leaks, such as the processing quality flanges, flange tilt, dislocation flange, flange sealing surface defects, bolt preload relaxation, proper gasket selection and installation media for corrosion in the gasket, pressure fluctuations and temperature changes

, Will have a huge effect on the sealing effect.
Changes in temperature, for example, the temperature rise in the initial expansion of the first cause of the flange, the spacer increases the amount of compression; with uniform temperature distribution, the temperature rises bolt expansion bolts will result in a decline in preload, Glass-to-metal seals completely lapse.
According to statistics, the reason causing flange seal leakage, 50% to 80% was due to decrease preload bolt resulting in seal failure. In general, the original bolt preload exerted a certain elongation of the bolt, and to produce a certain amount of compression pads (a certain pressure ratio), but due to

Medium temperature changes, sealing pressure drop caused by seal leakage.