Owner manual

Pressure Vacuum Breaker
Field testing of a pressure vacuum breaker involves testing both the internal spring
loaded soft seated check valve, as well as testing the spring loaded air inlet valve.
The testing must be performed with the device pressurized and the air inlet closed.
The number 2 shut-off valve must also be closed and the air inlet valve canopy
removed. Perform with Ball Valve C closed.
Test 1 - Refer to Figure 1
Test the internal check valve for tightness of 1 psid in the direction of flow using the
following procedure.
1. With the valve body under pressure, (number 2 shut-off valve closed and
number 1 shut-off valve open), bleed test cocks number 1 and number 2.
2. Hook up the high pressure hose (yellow) to number 1 test cock (red) and the low
pressure hose (red) to number 2 test cock.
3. Bleed the high pressure hose and low pressure hose (yellow), in that order, and
close the test kit valves slowly (ball valve A & needle valve B).
4. Record the differential pressure on the gage. A reading of 1 psid is acceptable
to insure a tight check valve.
Test 2
Test the air inlet valve for a breakaway of 1 psid using the following procedure.
1. Connect the high pressure hose (yellow) to test cock number 2, and bleed the
high pressure hose (yellow).
2. Shut off number 1 shut-off valve.
3. Slowly open the needle valve B of the test kit, and observe and record the
pressure when the air inlet poppet opens. This should be a minimum of 1 psid.
Restore the valve to normal service.
Series BTK2 Backflow Prevention Test Kit
Specifications - Installation and Operating Instructions
Bulletin P-BTK2
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]
S
PECIFICATIONS
P
ressure Limits: 175 psi (12 bar).
T
emperature Limits: 210°F (99°C).
Range: 4.5˝ gage: 0 to 15 psid (0 to 1 bar); 1.5˝ gage: 0 to 200 psi (0 to 14 bar).
Accuracy: 4.5˝ gage: ±2% FS; 1.5˝ gage: ±3-2-3% FS.
Wetted Parts:
4.5˝ Gage: Anodized aluminum;
4
.5˝ Gage Diaphragm: Buna-N;
1
.5˝ Gage: Brass;
B
all Valves: PTFE lined brass;
Needle Valve: Brass;
Hose Couplings: Brass;
Adaptors: Brass;
Hose: Rubber.
Size: Case: 9˝ H x 16˝ W x 9˝ D (228 mm H x 406 mm W x 228 mm D).
Weight: 8.9 lb (4 kg).
The Model BTK2 Backflow Prevention Test Kit is capable of testing hydronic
systems with test procedures recommended by ASSE, AWWA, CSA, FCCC, HR-
USV, and NEWWA. The BTK2 is comprised of three valves and is specially
designed for testing backflow prevention assemblies. The tests can be completed
i
n almost any area by mounting the unit with the included high performance elastic
c
ord. PTFE-lined brass ball valves simplify the adjustment procedure. The large,
e
asy-to-grip needle valve allows for quick adjustment. The kit includes a 4.5˝
diameter diaphragm differential pressure gage (0 to 15 psid), a 1.5˝ diameter in-line
pressure gage (0 to 200 psig), three 3´ long hoses (color-coded), three sets of
brass adapter fittings for hookups to all standard size test cocks, an elastic cord for
hanging/mounting, and a durable polyethylene carrying case.
*
Note: It is the responsibilty of the tester to ensure that the test procedures are
a
ccepted by the local authorities.
Prior to testing any backflow device, the following procedures are recommended:
1. Permission should be obtained from the owner, to shut down the water supply.
This is necessary to ensure, since all testing is accomplished under no-flow
conditions. Concurrent with the request for permission to shut off the water, it is
advisable to point out that while the water is shut off during the test period, any
inadvertent use of water within the building will reduce the water pressure to zero.
In order to address this situation, it is recommended that the owner caution the
inhabitants of the building not to use the water until the backflow test is completed
and the water pressure is restored.
2. Determine the type of device to be tested i.e., double check valve or reduced
pressure principle device.
3. Determine the flow direction.
4. Number the test cocks, bleed them of potential debris, and assemble appropriate
test cock adapters and bushings that may be required.
5. Shut off the downstream (number 2) shut-off valve.
6. Wait several moments prior to hooking up the test kit hoses when testing a
reduced pressure principle device. If water exits the relief valve, in all likelihood, the
first check valve is fouled and it is impractical to proceed with the testing until the
valve is serviced. This waiting period is not necessary when testing double check
valves.
Test personnel are cautioned to be aware and follow local municipal, county, and
state testing requirements and guidelines as may be dictated by local authority.
The following test procedures are guidelines for standard, generally acceptable
test procedures but may be amended, superseded, or modified by local jurisdiction
For field testing of reduced pressure principle backflow preventers and double
check valve assemblies, the BTK2 is utilized. All test equipment should be
periodically checked for calibration.
Ø
4-25/32
[
Ø121.36]
Ø1-41/64
[Ø41.66]
5
-31/64
[
139.46]
2
[
50.80]
3
[
76.12]
9-39/64
[244.27]
7
-7/16
[
189.07]
3´ HOSE WITH FEMALE COUPLINGS
[SHOWN UNATTACHED]