ZURN 350DA Double Check Detector Instruction Manual
- June 13, 2024
- ZURN
Table of Contents
ZURN 350DA Double Check Detector
Product Information
The Model 350DA is a Double Check Detector Assembly designed for installation on water lines in fire protection systems. It provides protection against both backsiphonage and backpressure of polluted water into the potable water supply. The assembly incorporates a metered by-pass to detect leaks and unauthorized water use. It is suitable for use in situations where a potential health hazard does not exist.
The assembly is made of high-quality materials including ductile iron, stainless steel, NORYLTM, and elastomers. It meets standards compliance for sizes 2 1/2 – 10 horizontally and vertically, and 12 horizontally only. The main valve body and access covers have a NSF Approved fusion epoxy finish for durability.
Various options are available for the Model 350DA, including different types of gate valves, water meters, and connections. Accessories such as repair kits, thermal expansion tanks, and tamper switches are also available.
The assembly comes in different sizes ranging from 2 1/2 inches to 12 inches. It has maximum working water pressure and temperature specifications, as well as hydrostatic test pressure requirements. The end connections are grooved for steel.
Product Usage Instructions
- Select the appropriate size of the Model 350DA assembly based on the water line requirements.
- Ensure that the installation location is suitable for protecting against backsiphonage and backpressure of polluted water into the potable water supply.
- Inspect the assembly for any damages or defects before installation.
- Follow the provided guidelines for connecting the assembly to the water line using the appropriate end connections (grooved forsteel).
- If required, choose and install the desired options such as gate valves, water meters, or additional accessories.
- Perform a hydrostatic test to ensure the assembly meets the specified pressure requirements.
- Regularly monitor the assembly for leaks or unauthorized water use through the metered by-pass.
- If any maintenance or repairs are needed, refer to the provided repair kit or contact the manufacturer for assistance.
Application
Designed for installation on water lines in fire protection systems to protect against both backsiphonage and backpressure of polluted water into the potable water supply. Model 350DA shall provide protection where a potential health hazard does not exist. Incorporates metered by-pass to detect leaks and unauthorized water use.
Standards Compliance
(Sizes 2 1/2″ – 10″ Horiz. & Vert.)
(12″ Horizontal Only)
-
ASSE® Listed 1048 (Sizes 2 1/2″ thru 12″)
-
CSA® Certified B64.5 (Sizes 2 1/2″ thru 8″, & 12″)
-
AWWA Compliant C510 (Sizes 2 1/2″ thru 12″), and C550
-
UL® Classified (Sizes 2 1/2″ thru 12″)
-
C-UL® Classified (Sizes 2 1/2″ thru 12″)
-
FM® Approved (Sizes 2 1/2″ thru 10″)
-
NYC MEA 147-99-M Vol 4 (2-1/2″ – 10)
-
Approved by the Foundation for Cross Connection
Control and Hydraulic Research at the University of Southern
California (Sizes 2 1/2″ thru 12″) -
Meets the requirements of NSF/ANSI/CAN 61
(0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)
By-Pass Backflow Assembly 3/4″ Model 950XLD
Materials
- Main valve body Ductile Iron ASTM A 536
- Access covers Ductile Iron ASTM A 536
- Coatings NSF Approved fusion epoxy finish
- Internals Stainless steel, 300 Series NORYL™
- Fasteners Stainless Steel, 300 Series
- Elastomers EPDM (FDA approved)
- Buna Nitrile (FDA approved)
- Polymers NORYL™
- Springs Stainless Steel, 300 Series
Dimensions & Weights (do not include pkg.)
MODEL 350ADA SIZE
| WEIGHT
---|---
LESS SHUT- OFF VALVES| OS&Y GATE VALVES
FLANGED
| OS&Y
GATE VALVES GROOVED
| BUTTERFLY VALVES GROOVED
in.| mm| lbs.| kg| lbs.| kg| lbs.| kg| lbs.| kg
2 1/2| 65| 68| 31| 178| 81| 160| 73| 140| 64
3| 80| 68| 31| 198| 90| 150| 68| 120| 54
4| 100| 106| 48| 296| 134| 282| 128| 190| 86
6| 150| 180| 82| 480| 218| 454| 206| 298| 135
8| 200| 374| 170| 850| 386| 802| 364| 548| 249
10| 250| 404| 183| 1222| 554| 1156| 524| 792| 359
12| 300| 463| 210| 1623| 736| n/a| n/a| n/a| n/a
Attention :
Model 350DA (flange body) and Model 350ADA (grooved body) have different lay
lengths.
MODEL 350DA SIZE
| DIMENSION (approximate)
---|---
A
| A WITH
BUTTERFLY VALVES
|
B LESS GATE VALVES
|
C
|
D
| E OS&Y OPEN|
E
OS&Y CLOSED
| E WITH
BUTTERFLY VALVES
|
F
|
G
in.| mm| in.| mm| in.| mm| in.| mm| in.| mm| in.| mm| in.| mm| in.| mm| in.|
mm| in.| mm| in.| mm
2 1/2| 65| 31| 787| 28| 711| 15 7/8| 403| 3 3/4| 95| 9| 229| 17 3/4| 451| 15
3/8| 391| 13 3/4| 349| 3 1/2| 89| 7 1/4| 184
3| 80| 32| 813| 28 1/2| 724| 15 7/8| 403| 3 3/4| 95| 9| 229| 20 1/4| 514| 17|
432| 13 3/4| 349| 3 1/2| 89| 7 1/4| 184
4| 100| 37 5/8| 956| 32 8/9| 835| 19 1/2| 495| 4 1/2| 114| 9| 229| 22 1/2|
572| 18 1/4| 464| 17| 432| 6| 152| 8| 203
6| 150| 44 5/8| 1133| 37 5/8| 956| 23 1/2| 597| 6| 152| 10 1/2| 267| 30 1/2|
775| 24 1/4| 616| 17 1/2| 445| 7| 178| 10| 254
8| 200| 60 7/8| 1546| 53 7/8| 1369| 37 3/4| 959| 10| 254| 12| 305| 37| 940| 28
1/2| 724| 16 15/16| 430| 8 1/2| 216| 11| 279
10| 250| 63 7/8| 1622| 57 7/8| 1470| 37 3/4| 959| 10| 254| 12| 305| 45 5/8|
1159| 34 3/4| 883| 16 15/16| 430| 8 1/2| 216| 12| 305
12| 300| 66 3/16| 1681| n/a| n/a| 38| 965| 10| 254| 12| 305| 53| 1346| 40 1/2|
1029| n/a| n/a| 8 7/8| 226| 16 3/4| 425
Zurn Industries, LLC | Wilkins
1747 Commerce Way, Paso Robles, CA U.S.A. 93446 Ph. 855-663-9876, Fax 805-238-5766
In Canada | Zurn Industries Limited
7900 Goreway Drive, Unit 10, Brampton, Ontario L6T 5W6, 877-892-5216
| Rev. Q Date: 9/22
Document No. BF-350DA Product No. Model 350DA
Patent zurn.com/patents Page 1 of 2
Options
(Suffixes can be combined)
- – with OS & Y gate valves (standard)
- L – less shut-off valves (flanged body connections)
- LM – less water meter
- – with gallon meter (standard)
- CFM – with cu ft meter
- CMM – with cu meter meter
- G – with groove end gate valves
- FG – with flanged inlet connection and grooved outlet connection
- PI – with Post Indicator Gate Valve
- GF – with flanged inlet connection and grooved outlet connection
- BG – with grooved end butterfly valves with integral monitor switches (2 1/2″ – 10″)
Accessories
- Repair kit (rubber only)
- Thermal expansion tank (Model XT)
- OS & Y Gate valve tamper switch (OSY-40)
Features
- Sizes: 2 1/2″, 3″, 4″, 6″, 8″, 10″, 12″
- Maximum working water pressure 175 PSI
- Maximum working water temperature 140°F
- Hydrostatic test pressure 350 PSI
- End connections (Grooved for steel) AWWA C606
(Flanged bolt pattern) ASME B16.42 Class 150
Flow Characteristics
MODEL 350DA 2 1/2″, 3″ & 4″ (STANDARD & METRIC)
MODEL 350DA 6″ & 8″ (STANDARD & METRIC)
MODEL 350DA 10″ & 12″ (STANDARD & METRIC)
Typical Installation
Local codes shall govern installation requirements. Unless otherwise specified, the assembly shall be mounted at a minimum of 12″ (305mm) and a maximum of 30″ (762mm) above adequate drains with sufficient side clearance for testing and maintenance. The installation shall be made so that no part of the unit can be submerged.
Capacity thru Schedule 40 Pipe (GPM)
Pipe size| 5 ft/sec| 7.5 ft/sec| 10 ft/sec| 15 ft/sec
2 1/2″| 75| 112| 149| 224
3″| 115| 173| 230| 346
4″| 198| 298| 397| 595
6″| 450| 675| 900| 1351
8″| 780| 1169| 1559| 2339
10″| 1229| 1843| 2458| 3687
12″| 1763| 2644| 3525| 5288
Specifications
The Double Check Detector Backflow Prevention Assembly shall be certified to NSF/ANSI/CAN 61, ASSE® Listed 1048, and supplied with full port gate valves. The main body and access cover shall be epoxy coated ductile iron (ASTM A 536), the seat ring and check valve shall be Noryl™, the stem shall be stainless steel (ASTM A 276) and the seat disc elastomers shall be EPDM. The first and second check valves shall be accessible for maintenance without removing the device from the line. The Double Check Detector Backflow Prevention Assembly shall be a ZURN WILKINS Model 350DA.
Zurn Industries, LLC
Wilkins
1747 Commerce Way, Paso Robles, CA U.S.A. 93446 Ph.
855-663-9876, Fax
805-238-5766
In Canada
Zurn Industries Limited
7900 Goreway Drive, Unit 10, Brampton, Ontario L6T 5W6,
877-892-5216
www.zurn.com