maintaining a constant gasket seating

Constant seating stress gaskets derive their name from the fact that the carrier ring profile takes flange rotation (deflection under bolt preload) into consideration. It is thought that a gasket will last longer if more compressive load is exerted on it. All shapes and sizes of rubber gaskets are manufactured. The material choice for gasket manufacturers is more difficult. An additional downside is that the metal used must be softer than the flange in order to ensure that the flange does not warp and thereby prevent sealing with future gaskets and seals.

Current trends in automotive power train applications are pushing elastomeric gasket seal materials to their limit. There are several ways to measure a gasket material's ability to withstand compressive loading. We manufacture all Neoprene sponge strip and EPDM sponge strip to any size required. The hot compression test is probably the most accepted of these. This is because seals and gaskets are being asked to do more in an era of longer warranties, hotter engines and more aggressive lubricants that may shorten the life of existing elastomers.Depending on various parameters like industrial usage, chemical contact, budget and measures the design for gaskets seals are created. 

A solid metal must be greatly compressed in order to become flush with the flange head and prevent leakage. Thus, the gasket is immune to common gasket failure modes that include creep relaxation, high system vibration, or system thermal cycles. Solid material gaskets can withstand higher temperature and pressure ranges than sheet gaskets. In such gaskets and seals the sealing elements are fully confined by the flange faces in opposing channels on the carrier ring.

When gasket manufacturers design seals and gaskets, they know that one of the more desirable properties of an effective gasket in industrial applications for compressed fiber gasket material is the ability to withstand high compressive loads. Any in-service compressive forces acting on the gasket are transmitted through the carrier ring and avoid any further compression of the sealing elements, thus maintaining a constant gasket seating stress while in-service. Gasket manufacturers are using  materials that were once state-of-the-art. Since metals are primarily used, process contamination and oxidation are risks.


Please login to post your comment..