Testing -
Reduced Pressure Zone Backflow Preventers
Watts TK-DP
The following Test Procedure is one of several that is recognized throughout the United
States for testing Backflow Preventers.
The following procedure is not a specific recommendation. The Watts series of test kits are
capable of performing any of the recognized Backflow test procedures.
For additional testing information send for IS-TK-DP/DL, IS-TK-9A and IS-TK-99E
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 TC #3 then VB. Now open TC #2 slowly, then VA. 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 connection
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 TC #4, then open VA. If relief valve does not drip, record
second check valve as “close 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 normal
operating condition.
RPZ
Test 1
RPZ
Test 2
RPZ
Test 3
Watts 995
Watts 995
Watts 995
VA
A B
VB
VA
A B
VB
VA
A B
VB
It is important that this device be tested periodically in compli-
ance with local codes, but at least once per year or more as ser-
vice conditions warrant. If installed on a fire sprinkler system
all mechanical checks, such as alarm checks, single checks
and backflow preventers should be inspected internally every
one to five years in accordance with NFPA 13 A and NFPA 25
7
Содержание 995 Series
Страница 11: ...11 NOTES...
