Question 74

Gate valve and check valve are required on the discharge side of an ejector pump.

The discharge side of an ejector pump must include both a gate valve and a check valve to ensure proper flow control and prevent backflow.

A) Gate valve and check valve

This option is correct because the gate valve allows for the isolation of the pump for maintenance, while the check valve prevents the backflow of water, ensuring that the system operates efficiently and safely.

B) Backwater valve and gate valve

This option is incorrect as a backwater valve is typically used in sewer systems to prevent backflow from the main sewer line, which is not the primary concern on the discharge side of an ejector pump. While a gate valve is included, the backwater valve does not fulfill the required function.

C) Flexible coupling

This choice is incorrect because a flexible coupling is a mechanical component that connects two shafts and does not serve a purpose on the discharge side of an ejector pump. It does not provide flow control or backflow prevention.

D) Water hammer control

This option is also incorrect as water hammer control refers to devices that mitigate the shock waves caused by sudden changes in water flow. While important in some systems, it is not a required component on the discharge side of an ejector pump.

Conclusion

The requirement for a gate valve and a check valve on the discharge side of an ejector pump is essential for effective operation and safety. This configuration ensures that the pump can be serviced without disrupting flow and that backflow is prevented, which distinguishes it from the other options that do not fulfill these specific roles.