Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What type of slide valve is commonly used in a duplex pump?

1. A "C" type slide valve

2. A "D" type slide valve

3. An "A" type slide valve

4. An "E" type slide valve

The correct answer is: A "D" type slide valve

The "D" type slide valve is commonly used in a duplex pump due to its design, which allows for efficient and reliable operation of the pump system. Duplex pumps are often employed in processes requiring consistent flow and pressure, and the "D" type slide valve effectively manages the flow of fluid within the pump by enabling smooth transitions between the two pumping chambers. This design minimizes the potential for pressure drops or surges, ensuring stable operation. Furthermore, the "D" type valve typically features an elongated shape that helps facilitate the switching between the two sides of the pump. This valve design provides advantages in terms of maintenance and replacement, as it tends to be more accessible when servicing the pump. In contrast, other slide valve types might not provide the same level of performance or compatibility with the operational demands of duplex pumps. This makes the "D" type slide valve the preferred choice in such applications.