What type of valve must be provided in the discharge line from a sewage ejector pump?

In the discharge line from a sewage ejector pump, it is essential to provide both a check valve and a full-open valve. The check valve plays a critical role in preventing backflow into the ejector pump. When the pump stops operating, the check valve ensures that the sewage does not flow back into the pump basin, which is important for maintaining system integrity and preventing potential flooding.

The full-open valve, often referred to as a gate valve or ball valve, allows for complete shut-off of the discharge line when necessary. This is crucial for maintenance purposes, as it enables the system to be isolated safely for repairs or inspections without causing a mess or risking backflow.

Combining both valves in the discharge line ensures robust operation – the check valve protects against unwanted backflow, while the full-open valve allows for easy maintenance and system control. This configuration is a standard practice in plumbing systems involving sewage ejector pumps, reinforcing the importance of using both types of valves for optimal functionality.