🔍 Key Concepts

• Identify how the symbol for item 3 differs from the symbols used for items 1, 2a, and 2b in the same diagram. • Think about the function of a relief valve vs. a check valve vs. a stop/gate valve in a piping system. • Consider where item 3 is located in relation to the pump (item 5) and the rest of the system and what purpose a valve in that location would normally serve.

💭 Think About

• Compare the symbol at item 3 to the valve symbols at items 1, 2a, 2b, 6, and 7. Which ones look like simple shutoff (stop/gate) valves, and which one is clearly different? • Ask yourself: Is item 3 likely there to stop/allow flow manually, to allow flow only in one direction automatically, or to protect the system from excessive pressure? • Look at the flow path from the pump (5) through item 3. If pressure rises too high, which type of valve would you expect to see in that position, and what would it do to the fluid?

✅ Before You Answer

• Verify which choice corresponds to a valve that opens automatically in response to system conditions (pressure or direction) instead of manual operation. • Confirm that a stop/gate valve symbol in this diagram is the same style as items 1 and 2a/2b, and notice that item 3 is not drawn the same way. • Check that the selected valve type is one commonly installed immediately downstream or in parallel with a pump to protect the system or control flow.