🔍 Key Concepts

• Purifier bowl components – know which parts are stationary and which move (inner bowl, outer bowl, ring dam, sliding piston). • Function of gasket U – look at what two metal parts this U-shaped gasket is sitting between in the cross‑section. • Liquid space boundary – trace the liquid space being sealed and see which major component forms its upper boundary.

💭 Think About

• Follow the label U on the illustration and identify the two metallic surfaces it separates. Which named component is directly above that gasket? • Ask yourself: in normal purifier operation, which part moves vertically to open/close the discharge, and which surrounding part must be sealed below its liquid space? • Compare the shapes and locations of the ring dam, inner bowl, outer bowl, and sliding piston in the figure. Which one’s lower side would need that U-shaped seal?

✅ Before You Answer

• Be sure you can correctly point to and name the ring dam, inner bowl, outer bowl, and sliding piston on the drawing before choosing. • Verify which part forms the upper wall of the liquid space that the U gasket is sealing underneath. • Confirm that gasket U is a static seal between a moving piece and a stationary surrounding piece, and match that condition to the correct choice.