Tätningsytan

Tätningsytan is the contact surface on a component that forms a seal with a mating surface or sealing element to prevent leakage of fluids or gases under operating conditions. It is critical in joints using gaskets, O-rings, or lip seals, and is designed to be flat, parallel, and free of defects so that the sealing element can deform properly under clamping force.

Design features include surface flatness and planarity, perpendicularity and parallelism to the mating face, and an appropriate surface roughness. The choice of roughness depends on the sealing system: metal-to-metal seals generally require very smooth surfaces, while some elastomeric or composite gaskets tolerate slightly rough finishes. The surface should also be free from burrs, scratches, tool marks, corrosion pits, or debris. In some flange configurations, the sealing face is a raised face or a recessed groove to improve sealing performance.

Manufacturing and inspection: Tätningsytan is produced by machining processes such as turning, milling, grinding, lapping, or polishing, followed by cleaning. Roughness, flatness, and surface integrity are checked with profilometers and straightness gauges; non-destructive inspection can detect subsurface damage.

Operation considerations: Sealing performance depends on gasket material, clamping pressure, temperature, pressure, and chemical compatibility. Proper gasket selection, surface cleaning, and correct torquing are essential to avoid leaks. Coatings or surface treatments may be used to improve corrosion resistance or reduce galling.

Standards: Many industries reference standards specifying acceptable surface finishes for sealing faces, including flange and valve applications.