🔍 Key Concepts

• Feedwater regulator function and where it should be located relative to the boiler drum and the main stop valve • Purpose of a stop valve versus a stop-check valve on boiler feed lines • Which valve must be able to prevent backflow from the boiler into the feed line if a line parts or a pump fails

💭 Think About

• Think about the direction of water flow: from the feed pump toward the boiler. In what order do you want to control flow, regulate level, and prevent reverse flow? • Which valve do you want located closest to the boiler so that the boiler cannot drain back through the line? • Where should the automatic control device (regulator) be placed so it can sense and control boiler water level effectively without being isolated when the line is shut down?

✅ Before You Answer

• Identify which valve type is specifically designed to serve as both a stop valve and a check valve and therefore is usually installed right at the boiler inlet • Confirm that the regulator must be installed so that it is not rendered useless whenever the main stop is closed for isolation • Make sure the arrangement allows you to first isolate the line, then automatically control flow, and finally prevent backflow from the boiler into the feed system