🔍 Key Concepts

• Internal flow path through the valve body and how the fluid changes direction • Shape and motion of the closing element (disc/gate/plug) relative to the seat • Typical construction details of gate, globe, butterfly, and check valves in section view

💭 Think About

• Look at the flow passage in the illustration: does the fluid pass straight through or change direction as it goes past the seat? • Observe how the stem moves the closure piece: is it lifting a plug straight up and down, sliding a flat gate across the flow, rotating a disk, or acting automatically with no handwheel? • Compare the seat area: does it look like a flat vertical plate, a round plug on a seat, a thin rotating disk, or a hinged/flapper-style element?

✅ Before You Answer

• Check whether the closure element moves parallel to the flow (typical of one option) or perpendicular to the flow (typical of another). • Verify if the valve clearly has a handwheel-operated stem that screws a plug onto a seat, which would rule out one of the listed automatic valve types. • Confirm that there is no rotating disk in the center of the bore, which would eliminate one common option.