HT A School Collection, Holding, and Transfer (CHT) Test 2025 – 400 Free Practice Questions to Pass the Exam

The component of sewage systems that effectively helps to control backflow is the swing check valve. This type of valve is designed to allow fluid flow in one direction while preventing it from flowing backward. The mechanism involves a hinged disc that swings open with forward flow, and when there is a change in pressure or flow direction, the disc swings back to close off the line, thus preventing backflow.

In sewage systems, managing backflow is crucial because it helps to maintain system integrity, protects infrastructure, and prevents contamination. The swing check valve is particularly valuable in this context as it operates automatically without the need for external power sources or manual operation, providing reliable protection against backflow events.

Other types of valves, such as the pump control valve, float valve, and solenoid valve, serve different purposes within fluid control systems. While they may contribute to flow regulation in their respective capacities, they do not specifically function to prevent backflow in the way that a swing check valve does. This distinction highlights the specific role that the swing check valve plays in maintaining the proper flow direction within sewage systems.