🔍 Key Concepts
• In a mechanical shaft seal, the dynamic seal ring rotates with the shaft and presses against a stationary face to form the primary sealing surface.
• The dynamic ring is usually located directly against the shaft and is pushed by springs toward the stationary ring.
• Distinguish between the main sealing rings and supporting parts such as O-rings, springs, and set screws.
đź’ Think About
• Look at which labeled part is clearly rotating with the shaft, not fixed in the housing. Which of A, B, E, or G appears to be mounted on or around the shaft itself?
• Identify the primary sealing face: which part’s flat face is shown in contact with another ring, rather than just backing it up or holding it in place?
• Among the options, which part is closest to the springs and would be pushed by them toward the stationary ring to maintain contact during operation?
âś… Before You Answer
• Verify which component has its inner surface directly on the shaft, indicating it will turn with the shaft.
• Confirm that the part you choose has a flat face that mates with another ring, forming the primary sealing interface, not just a soft secondary seal like an O-ring.
• Eliminate any parts that are clearly fasteners or housing components (such as set screws or the gland) that do not form the rotating sealing face.