Ames Fire & Waterworks ATG-1 Backflow Preventer Test Kit User Manual
Page 3
3
1. When using differential pressure gauge
A. Check differential across No. 1 check valve
Reading Problem
2 to 3 PSID
Leak in No. 1 or No. 2 check valve
4 to 7 PSID and steady
Malfunctioning pressure relief valve
2 to 7 PSID fluctuating
Inlet pressure fluctuating
2. Without using differential pressure gauge.
A. Close gate valve No. 2
Result Problem
If discharge stops
Leak in No. 2 check valve
If discharge does not stop
Go to B
B. Open No. 4 test cock to product a flow greater
than differential relief valve discharge
Result Problem
If discharge stops
Leak in No. 1 check valve
If discharge does not stop
Malfunctioning pressure
relief valve
Problem Identification Procedures - For RPZ Assemblies
PROBLEM: Continuous or intermittent discharge from relief valve.
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