Test Procedure for Reduced
Pressure Zone Backflow Preventers
The following Test Procedure is one of several that is recognized
throughout the United States for verification of the functioning of
backflow preventers.
The following procedure is not a specific recommendation. The
Watts series of test kits are capable of performing any of the recog-
nized backflow test procedures.
A. Open TC #4 and flush test cocks Nos. 1, 2, and 3 on BF
assembly, then close TC #4.
B. Turn tester on (before connecting hoses). Tester must read all
zeros. Close VA and VB.
Test No. 1 - Relief Valve
1. Install high side hose between TC #2 and tester connection A.
2. Install low side hose between TC #3 and tester connection B.
3. Open VB then TC #3. Now open VA then TC #2 slowly. Close
VA then VB.
4. Close #2 shutoff valve.
5. Observe the apparent first check valve differential pressure (A - B).
6. Install bypass hose between VA and VB. Open VB and bleed
air by loosening hose connection at VA. Tighten hose connec-
tion and close VB.
Push - Print Head (wait) then Push - Start Test
7. Open VA, then slowly open VB (no more than
1
⁄
4
turn). When
relief valve drips, push the “hold” button for 2 seconds.
Record reading (must be 2 psid or more).
Push - Stop Test
8. Close VA and VB.
Test No. 2 - Test No. 2 Check Valve
9. Install bypass hose between VA and TC #4. Open VA, then
bleed air by loosening hose connection at TC #4. Tighten
hose connection.
Close VA.
Push - Start Test
10. Open VB to reestablish pressure within the “zone”. Close VB.
11. Open VA then TC #4. If relief valve does not drip, record sec-
ond check valve as “closed tight”.
Test No. 3 - Test No. 1 Check Valve
12. Open VB to reestablish first check valve differential pressure.
Close VB. Record pressure differential.
Stop Test (Push Stop Test twice)
13. Close test cocks and remove tester, return assembly to nor-
mal operating condition.
4
Replacement Water Meters for 2
1
⁄
2
" - 10" Series 909RPDA, 990RPDA and 992RPDA.
ORDERING
VALVE
CODE
SERIES
SIZE
DESCRIPTION
0835561
909RPDA/990RPDA/992RPDA
2
1
⁄
2
" – 10"
D709BA203-GPM-B (registers in gallons)
1203010
909RPDA/990RPDA/992RPDA
2
1
⁄
2
" – 10"
D709BB203-CFM-B (registers in cubic feet)
CFM AND GPM Outside Reader Kit
0899022
909RPDA/990RPDA/992RPDA
2
1
⁄
2
" – 10"
ROM DC/RP CFM-B
0899023
909RPDA/990RPDA/992RPDA
2
1
⁄
2
" – 10"
ROM DC/RP GPM-B
For complete testing information, send for IS-TK-9A or IS-TK-DP/DL.
Watts TK-DP
Water
Meter
Outside
Reader
RPZ
Test 1
RPZ
Test 2
RPZ
Test 3
VA
A
B
VB
VA
B
VB
A
VA
B
VB
A
