tätningsyta

Tätningsyta, in engineering literature often referred to as the sealing surface, is the contact face on a mating component that works together with a gasket, O-ring, or another seal to prevent leakage of fluids under pressure. The term is commonly used in contexts such as flanged connections, valve bodies, cylinder heads, and pump housings. The performance of a seal depends largely on the quality and geometry of the tätningsyta.

The key requirements for a tätningsyta are dimensional accuracy and surface finish. The surface should be machined to tight flatness, perpendicularity, and parallelism relative to mating surfaces, with runout limited to preserve even contact along the seal. Surface texture is crucial: the roughness must be controlled to allow the seal to seat properly without causing excessive wear or leakage. Too rough a finish can gouge a gasket or trap contaminants, while too smooth a finish may prevent adequate gasket deformation and sealing.

Materials and treatments for tätningsytor must be compatible with the sealed fluid and the seal material. Common choices include metals such as stainless steel and cast iron, sometimes with surface coatings or corrosion protection. Finishing processes include milling, grinding, lapping, and polishing, as well as surface conditioning to improve corrosion resistance or reduce galling.

Measurement and standards for tätningsytor often involve surface roughness testing (ISO 4287 and similar standards) and dimensional tolerancing according to relevant mechanical or piping codes. Ensuring proper design, finishing, and inspection of the tätningsyta is essential for reliable sealing in hydraulic, pneumatic, and fluid-handling systems.