Watts TK-99D - Manual (Page 2)

Test Procedure for Reduced Pressure Assembly
A. All needle valves must be closed on test kit.
B. Open test cock No. 4 and flush test cocks Nos. 1, 2 and 3
on reduced pressure assembly. Close test cock No. 4.
C. Attach hoses as shown. High side hose between TC #2
and low side hose to TC #3 and close No. 2 shutoff. Bleed
air from kit by opening TC #4 to establish flow through the
backflow preventer and prevent premature opening of the
relief valve. Open TC#3, needle valve “B “, and vent needle
valve. Close needle valve “B”. Open TC#2 and needle valve
“A”, close needle valve “A” and TC #4. Attach vent (yellow)
hose to TC#4 and vent needle valve. Open TC #4 and
loosen hose at vent needle valve connection bleeding air
from test kit. Re-tighten hose to vent needle valve.
High (red)
909QT-S shown
Turn Test Kit On
Test No. 1 - Check Valve No. 2
Purpose: To test check valve No. 2 for tightness against reverse
flow.
Requirements: Valve must be tight against reverse flow under
all pressure differentials.
Step 1
With vent needle valve open, slowly open needle
valve “A”. (keep “B” closed)
Step 2 Indicated pressure differential will decrease slightly.
If pressure differential continues to decrease (until
the relief valve opens) the No. 2 check valve is
reported as “leaking”.
Test No. 2 - Shutoff Valve No. 2
Purpose: To test shutoff valve No. 2 for tightness.
Step 1 After passing Test No. 1, continue to test No. 2 by
closing test cock No. 2.
Step 2 The indicated pressure differential will decrease
slightly. If pressure differential continues to decrease
(approaching Zero), the No. 2 shutoff valve is re-
ported to be leaking. Note: A leaking No. 2 shutoff
will give a false reading in tests No. 3 and 4.
Test No. 3 - To test No. 1 check valve
Purpose: To test check valve No. 1 for tightness.
Requirements: Valve must be tight against reverse flow under all
pressure differentials.
Step 1 Close needle valve “A” high side (red) and open test
cock No. 2
Low (blue)
Bypass
(yellow)
Test Procedure for Anti-Spill Vacuum Breaker
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
recognized Backflow Preventer test procedures.
Note: For all of the following tests the test kit must be held at
the same level as the assembly being tested.
A.
Before starting test, all needle valves on the test kit must
be closed.
B. Flush test cocks before testing.
Test Cock
High
(red)
Test No. 1 and 2, Watts 008QT shown
Turn Test Kit On
Test No. 1 - Differential Test
Requirement: Differential pressure across check must be 1.0
PSID or above.
Step 1
Remove two screws on top of hood then remove
hood.
Step 2 Install hose between test cock and connection “A”
high side (red) of test kit.
Step 3 Open test cock then open needle valve “A” and vent
or bypass needle valve. Bleed air from hose then
close vent needle valve.
Step 4 Close shutoff valve No. 2 then shutoff valve No. 1 on
the assembly.
Step 5 Slowly unscrew bleed screw on spill proof vacuum
breaker body to relieve pressure down stream of
check (about 3 turns)
Step 6 When dripping from bleed screw stops and gauge
stabilizes, record the differential pressure and re-
tighten bleed screw.
Test No. 2 - Air Inlet - Vent Opening
Requirement: Air inlet must start to open when supply pressure
is 1.0psi or above. Air inlet must be fully open when supply
pressure is atmospheric.
Step 7
Slowly open vent needle valve until gauge reads
1.0 PSID then close vent needle valve holding pres-
sure at 1.0 PSID.
Step 8 Visually inspect that the vent on top is slightly open,
about 1⁄32", to pass test.
Step 9 Open vent needle valve fully until dripping from vent
connection stops.
Step 10 Visually inspect that the vent is fully open to pass test.
Step 11 Replace hood and two screws on top of assembly.
Step 12 Restore valve to original working condition.
Note: After test, leave all valves on test kit must be fully open
and hose removed to prevent freeze damage to test kit.
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