🔍 Key Concepts

• How a check valve symbol is drawn on a piping diagram (direction of the triangle vs. the seat/line) • The difference between a check valve (one-way flow) and a regular stop valve (two-way, manually operated) • How fluid must flow in this system for the pump and reservoir to work correctly without backflow

💭 Think About

• Look closely at the check valve symbol: which side has the solid line (the valve seat) and which side has the open triangle? In standard symbols, which side is the direction that allows flow? • Trace the intended normal flow path from the pump, through the system, and back to the tank. In that path, how must the check valve be oriented to prevent reverse flow when the pump stops? • Compare the check valve symbol near the component labeled 8 with the one asked about near 7. Are they drawn the same way, and what does that tell you about the permitted flow direction?

✅ Before You Answer

• Verify which part of the symbol is the blocked side (solid line) and which part is the free-flow side (open triangle). • Confirm that your chosen direction is consistent with overall system flow from source to discharge and not causing impossible circulation. • Make sure you are not confusing the check valve with a globe/gate valve symbol that can pass flow in either direction.