The seat of a butterfly valve will most likely be constructed of __________.

Correct Answer: Option D — a resilient material

Butterfly valves utilize a resilient seat, typically made of synthetic rubber or elastomers like EPDM or Viton. This material allows the disc to compress against the seat, creating a tight, bubble-proof seal. Unlike metal-to-metal seats, these resilient materials compensate for minor surface irregularities and ensure effective shutoff.