Knowledge of a spiral wound gasket
Posted: 05/29/2018 03:37:23 Hits: 54
A spiral wound gasket is one of the most widely used gaskets currently. A spiral wound gasket comprises a mix of metallic and filler material. A gasket has a metal wound outwards in a circular spiral with the filler material (generally a flexible graphite) wound in the same manner but starting from the opposing side. A gasket is applied to high temperature, high pressure, ultra-low temperature and vacuum conditions. The problem of the gasket being corroded by all kinds of medium can be solved by changing materials of gaskets. The structural density can be made according to the requirements of different clamping forces. A spiral wound gasket has very good sealing effects, long service life and good practicality, which makes the spiral wound gasket widely used in various industries.
There are four types of metal wound gaskets, that is, the basic type, the inner and outer ring type, the inner ring type and the outer ring type.
Applications of spiral wound gaskets
A spiral wound gasket is used for flange connections of valves, pressure vessels, condensers, heat exchangers, towers, manholes and hand holes in petroleum, chemical, metallurgy, electric power, shipbuilding and machinery industries.
Leakages of spiral wound gaskets
The gap on the contact surface is the root cause of the leak, and the pressure difference and concentration difference on both sides of the contact surface are the driving forces for leakages. There is a gap on the sealing surface due to the influence of the form of the sealing surface and the processing accuracy. This will cause the sealing surface not to be fully fit, resulting in leakages.
It is necessary to maximize the cross-sectional area of the leakage passage and to increase the leakage resistance in order to reduce leakages. Applying a compressive load on the sealing surface to create a compressive stress can have better sealing performance. When the stress is increased enough to cause significant plastic deformation of the surface, the clearance of the sealing surface can be filled to block the leakage path.
There are four types of metal wound gaskets, that is, the basic type, the inner and outer ring type, the inner ring type and the outer ring type.
Applications of spiral wound gaskets
A spiral wound gasket is used for flange connections of valves, pressure vessels, condensers, heat exchangers, towers, manholes and hand holes in petroleum, chemical, metallurgy, electric power, shipbuilding and machinery industries.
Leakages of spiral wound gaskets
The gap on the contact surface is the root cause of the leak, and the pressure difference and concentration difference on both sides of the contact surface are the driving forces for leakages. There is a gap on the sealing surface due to the influence of the form of the sealing surface and the processing accuracy. This will cause the sealing surface not to be fully fit, resulting in leakages.
It is necessary to maximize the cross-sectional area of the leakage passage and to increase the leakage resistance in order to reduce leakages. Applying a compressive load on the sealing surface to create a compressive stress can have better sealing performance. When the stress is increased enough to cause significant plastic deformation of the surface, the clearance of the sealing surface can be filled to block the leakage path.
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