🔍 Key Concepts

• blow down on a safety valve (difference between popping pressure and reseating pressure) • role of the huddling chamber and nozzle in creating additional lift and rapid opening • which part of the valve is movable and positioned around the nozzle to change how much steam is directed into the huddling chamber

💭 Think About

• Looking at the illustration, which labeled part is located right around the valve seat and nozzle, where steam first exits when the valve pops? • Which component, when moved up or down, would change how strongly steam is directed into the huddling chamber, therefore changing the pressure at which the valve reseats? • Which option in the choices is specifically designed to be adjusted for blow down, rather than for set pressure or guiding the stem?

✅ Before You Answer

• Identify the part in the picture just above and around the valve seat/nozzle area and match it to the answer choices • Distinguish between the device that changes set pressure (spring compression) and the one that changes blow down • Confirm that the part you select is an annular ring or similar piece whose position can be shifted to alter steam flow into the huddling chamber