Industrial seal self study guide - SKF.com

CHAPTER 3 REVIEW (cont.)
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7. The V-Ring is an all-rubber seal that _________________.
❑ a. mounts directly on the shaft by hand
❑ b. is sealed axially against a counterface, housing bearing race or similar surface
❑ c. acts like a mechanical face seal, or flinger
❑ d. all of the above
7. D
8. Heavy-duty mechanical seals (HDDF) _________________.
❑ a. retain lubricants
❑ b. exclude contaminants
❑ c. can be used under severe service conditions
❑ d. all of the above
9. _________________ are recommended for large diameter applications where there is a
need for two seals but room for one, as in steel and paper mills or logging operations.
❑ a. Heavy-duty seals
❑ b. Axial clamp seals
❑ c. V-Rings
❑ d. None of the above
9. B
10. HDS metal clad and HS non-metal clad (all-rubber) seals are the two basic types of
large diameter seals.
❑ True ❑ False
10. T
11. Cover plates, required by all HS type seals, provide axial compression and supplement
radial press-fit to ensure leakproof seals.
❑ True ❑ False
11. T
12. Pressure Waveseals (CRW5 and CRWA5) perform better than conventional
lip seal designs in pressurized environments, and can be used to replace some
mechanical seals.
❑ True ❑ False
13. Type HDSD has two opposing elements in a single shell, making it ideal
for separating two fluids in applications where two seals are impractical.
❑ True ❑ False
8. D
12. T
13. T
14. PTFE seals can run for long periods of time without lubrication and resist attack by
many acids and solvents.
❑ True ❑ False
14. F
15. Metal clad seals (Type HDS) are incapable of handling high speeds.
❑ True ❑ False
15. F