Mechanical Face Seals or heavy duty seals are specifically engineered for rotating applications in extremely arduous environments where they withstand severe wear and prevent ingress of harsh and abrasive external media. A Mechanical Face Seal is also known as Heavy Duty Seal, Face Seal, Lifetime Seal, Floating Seal, Duo Cone Seal, Toric Seal, Mechanische Laufwerkdichtungen (German), Механични Челни Уплътнения (Bulgarian), 机械端面密封件 (Chinese), Mekaniske aksialtætninger (Danish), Mekaaninen otsatiiviste (Finnish), Joints d’Etanchéité Axiaux (French), Mechaniczne Uszczelnienie Czołowe (Polish), Juntas espejo (Spanish), Mekaniska Glidringstätningar (Swedish).

The two different types of face seals are O-ring type (DO type) and trapezoid type (DF type). These types refer to the shape of the secondary sealing element cross-section. DO type is the most common. DF type offers easier installation without special tools, as well as more easily machined housings.

DO Type Mechanical Face Seal introduction

DO type is standard mechanical face seal composed of two metal parts.This design consists of two symmetrically tapered seal rings and two O-rings. At installation, the o-rings are compressed between thetapered contact surfaces of the seal ring and housing.The o-rings undergo a calculated compression whichis critical for proper operation of the sealing system(dimension “S”). Cleanliness of the o-rings and housing(free of oil and dirt) is of primary importance. Lubrication of the o-rings with oil or grease is not permitted during the installation process.