The most common design of mechanical face seals is the oring design This design consists of two symmetrically tapered seal rings and two orings The oring style has two versions, the 7690H which has a ground profile, and the 7697 which has an ascast profile In general, both versions are completely interchangeableAn Oring seal is used to prevent the loss of a fl uid or gas The seal assembly consists of an elastomer OOf the Oring between the piston and cylinder or shaft and groove, up to 5,000 psi using 90 durometer compound ROTATING SEALS (Design Chart 5) Rotating seals should be limited to shafts having the following maximum rotational speed Shaft Diameter 125 280 – 350 ft/min Shaft Diameter 281 625 – 400 ft/min
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