🔍 Key Concepts

• Operation of a thermostatic bellows-type steam trap • Relationship between temperature, vapor pressure, and bellows expansion inside space "A" • How movement of the bellows and valve changes the opening at "D" and thus the condensate flow

💭 Think About

• In this trap, what happens to the bellows and valve position when the fluid in space "A" gets hotter and starts to change phase? • When the bellows expands vs. contracts, does the opening at "D" become larger or smaller, and how does that affect condensate flow rate? • Which option describes a condition inside "A" that would tend to close the valve at "D" rather than open it?

✅ Before You Answer

• Identify whether increased vapor pressure in A makes the bellows longer or shorter • Visualize how a longer or shorter bellows moves the valve plug at C relative to the seat at D • Check which choices describe a change that would make the valve more closed, thereby reducing condensate flow