Engine 2014: Steam Plants

1. A The valve is held open by a pressure pilot line.
2. B Once the valve has opened, the existing steam pressure acts on an enlarged area creating an opening force greater than  that which opened the valve.
3. C Once the valve lifts, the set opening pressure changes.
4. D The safety valve opens gradually but with decreasing lift during the blow down period.

Tip: press A-D to answer