🔍 Key Concepts

• Globe valve internal parts: seat and disk, and how they seal • Processes used to smooth and true up metal surfaces that must fit tightly together • Which machining or finishing methods can be done by hand with the valve still installed in the line

💭 Think About

• Think about which process specifically means rubbing two surfaces together with an abrasive to improve the seal between them. • Ask yourself: which option is commonly used for finishing valve seats and other precision sealing faces, especially in the engine room? • Consider which listed processes normally require machine tools versus which can be done by hand with simple tools and compound.

✅ Before You Answer

• Verify which process is associated with creating a flat, tight-sealing surface between two mating metal parts. • Eliminate any process that is mainly for decorative surface texture or for enlarging/drilling a hole rather than improving a flat sealing face. • Confirm which term you have seen in connection with reconditioning valve seats/disks in marine engineering maintenance manuals.