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The Rpz Test Procedure document provides essential guidelines for conducting tests on backflow prevention devices. This guide will help you navigate through the process of filling out this form online effectively and accurately.

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2. Begin with Test Preparation: check and, if necessary, open upstream isolating valve (4), then close downstream isolating valve (5). Open and close test taps (1), (2), and (3) to remove any impurities. Ensure Test Kit Valve (A) is open, (B) is closed, and (C) is open.
3. In the Test Isolating Valves section, connect the high-pressure hose to test tap (3). Gradually open test tap (3) and allow water to vent through the vent hose. Sequence close test kit valve (C) and upstream isolating valve (4), noting that the differential gauge will show a high reading.
4. Open test kit valve (B) slowly to decrease gauge pressure by 20 kPa. Then close test kit valve (B). Monitor the differential gauge: if the pressure rises, it indicates a leak in either the upstream or downstream isolating valve. To identify the faulty valve, open test tap (1). Continuous discharge from (1) indicates upstream isolating valve (4) is leaking. If pressure drops near zero, downstream isolating valve (5) is leaking.
5. Proceed by closing test tap (3) and opening test kit valve (C) to release hose pressure before disconnecting the high-pressure hose from test tap (3). Clean the line strainer, if fitted.
6. To test the upstream non-return valve, connect the high-pressure hose to test tap (1) and the low-pressure hose to test tap (2), then open both test taps. Gradually open test kit valve (A) and allow water to vent through the hose, then close (A).
7. Open needle valve (B) to bleed water through the vent hose, then slowly close test kit valve (B). Record the reading on the differential pressure gauge; if below 35 kPa, the upstream non-return valve is faulty and requires repair or replacement.
8. For testing the relief valve, close test kit valve (C) and open test kit valve (A). Gradually open needle valve (B) while watching both the differential gauge and relief port. Record the gauge reading when the relief port starts discharging. If the reading is below 14 kPa, the relief mechanism is faulty and needs repair or replacement.
9. For the downstream non-return valve, disconnect the low-pressure hose from test tap (2) and reconnect it to test tap (3). Open test taps (1) and (3) and repeat the bleeding process with test kit valve (A) and (B).
10. Close test taps (1) and (3), open test kit valves (A), (B), and (C). Finally, disconnect all test kit hoses and open downstream isolating valve (5) to return the valve to service.
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