Backflow Test Simulator

Welcome to the AWWA Simulator

This tool is an interactive training module for the Watts LF009 Reduced Pressure Zone (RPZ) assembly and TK-99E test kit.

Why does it Dump?

The core safety principle of an RPZ assembly is maintaining a hydraulic buffer. The pressure in the center chamber (Zone 2) must ALWAYS be lower than the supply pressure (Zone 1).

If Check Valve 1 (CV1) fails, high-pressure water bleeds into Zone 2. As the Differential Pressure (DP) drops towards 2.0 PSID, the heavy relief valve spring overcomes the hydraulic pressure holding it shut.

Result: The port opens, expelling the contaminated water and maintaining the physical air gap to protect the city water supply!

⚠️ Procedure Warning!

You opened the main test kit control valves before flushing the air from the hoses!

Physics Check: Because you connected the chambers, the differential pressure will still drop and the RV will still dump (physics doesn't care about rules).

Exam Check: In a real AWWA exam, failing to flush the air from the High and Low bleeds first is an automatic procedural failure.