🔍 Key Concepts

• Identify the valve type from the illustration by looking at the straight-through flow path and the wedge-shaped closing member attached to a rising stem. • Recall which valve type is best suited as a stop (shutoff) valve versus for throttling (regulating) flow. • Think about how a valve designed for one‑way flow only (check valve) is constructed compared to the illustrated valve.

💭 Think About

• Does the illustrated valve close by sliding a plate/wedge across the flow, or by pushing a plug down onto a seat that changes the flow direction? How does that affect its best use? • If this valve were used half‑open for long periods, what would happen to the seating surfaces and the flow velocity past the partially open element? • Looking at the ports on each side of the body, does the design show any feature (like a hinged disc or spring‑loaded poppet) that would limit flow to a single direction?

✅ Before You Answer

• Confirm whether the flow path through the valve body is straight‑through and full‑bore when open, or sharply changes direction. • Check if the moving element looks like a gate/wedge that lifts completely out of the flow when open, or a plug/disc meant to sit in the stream for regulation. • Verify that there is no internal mechanism (hinge, spring, separate disc) that would make the valve operate automatically for one‑direction flow only.