Oilers/Plant Tenders (HHC) Civil Service Practice Exam

In a reciprocating steam engine, what is true about the piston-type steam valve?

1. It can only operate under low steam pressures

2. It is prone to leakage

3. It can be operated under high steam pressures

4. It requires frequent maintenance

The correct answer is: It can be operated under high steam pressures

The piston-type steam valve in a reciprocating steam engine is designed to handle steam conditions effectively, including high steam pressures. These valves are constructed to provide a good seal and can accommodate the expansion and contraction that occurs with different pressure levels. Their design allows for reliable operation in varying steam environments, making them suitable for applications where higher pressures are present. Operating efficiently under high steam pressures is essential for maximizing the performance of the steam engine, as steam generated at higher pressures can contribute to increased power output. Thus, the ability of the piston-type steam valve to function effectively in such conditions is a significant advantage that facilitates the overall operation of the engine. While other elements such as maintenance and potential leakage are considerations in valve design and operation, they do not negate the ability of the piston-type steam valve to operate under high pressures. Maintenance needs can vary depending on the system design and use, but the primary characteristic that highlights the valve's capability is its performance under elevated pressure scenarios.