Model 350AST
Double Check Valve Assembly
Application
Designed for installation on potable water lines to protect against both backsiphonage and backpressure of polluted water into the potable water supply. The Model 350AST shall provide protection where a potential health hazard does not exist. Ideal for use where Lead-Free* valves are required.
Standard Compliance (Horizontal and Vertical)
- ASSE® Listed 1015
- AWWA Compliant C510 (with gates only), and C550
- UL® Classified
- C-UL® Classified
- FM® Approved
- CSA® Certified B64.5
- cUPC® Listed
- Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California
- Meets the requirements of NSF/ANSI/CAN 61*
*(0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)
Materials
| Main valve body | 304L Stainless steel |
| Access covers | 304L Stainless steel |
| Internals | Stainless steel, 300 Series NORYL™ |
| Fasteners and springs | Stainless Steel, 300 Series |
| Seal ring | EPDM (FDA approved) |
| O-ring | Buna Nitrile (FDA approved) |
Features
Sizes: 2 1/2”, 3”, 4”, 6”, 8”, 10”
Maximum working water pressure: 175 PSI
Maximum working water temperature: 140˚F
Hydrostatic test pressure: 350 PSI
End connections:
(Grooved for steel pipe) AWWA C606
(Flanged) ANSI B16.42 Class 150
(SHOWN WITH OPTIONAL OSY GATE VALVES)
Options (Suffixes can be combined)
| … – | with flanged end NRS gate valves (standard) |
| … FSC – | with epoxy coated wye type strainer (flanged only) |
| … G – | with grooved end NRS gate valves |
| … GF – | with grooved inlet gate connection and flanged outlet gate connection |
| … FG – | with flanged inlet gate connection and grooved outlet gate connection |
| … OSY – | flanged end OS&Y gate valves |
| … OSYG – | with grooved end OS&Y gate valves |
| … PI – | with Post Indicator Gate Valves |
| … BG – | with grooved end butterfly valves with integral supervisory switches |
| … BF – | with flanged end butterfly valves with integral supervisory switches |
| … OSY – | flanged end OS&Y gate valves |
*New Connected Products. Search ZCSM-PF on Zurn.com for details.
Accessories
- Connected Pressure Monitor (Model ZCSM-PF)*
- Connected Flow Meter Option (Model ZCSM-BTM must be ordered with Model ZCSM-PF)*
- Repair kit (rubber only)
- Thermal expansion tank (Model XT)
- OS & Y Gate valve tamper switch (OSY-40)
Dimensions & Weights (do not include pkg.)
| MODEL 350AST SIZE | WEIGHT | ||||||||||||||
| WITHOUT GATES | WITH NRS GATES (GXF) | WITH OS&Y GATES (GXF) | WITH NRS GATES (GXG) | WITH OS&Y GATES (GXG) | WITH BUTTERFLY VALVES (GXG) | WITH BUTTERFLY VALVES (GXF) | |||||||||
| in. | mm | lbs. | kg | lbs. | kg | lbs. | kg | lbs. | kg | lbs. | kg | lbs. | kg | lbs. | kg |
| 2 1/2 | 65 | 33 | 15 | 94 | 43 | 112 | 51 | 86 | 39 | 104 | 47 | 79 | 36 | 89 | 40 |
| 3 | 80 | 34 | 15.4 | 112 | 51 | 130 | 60 | 102 | 46 | 120 | 54 | 83 | 38 | 96 | 44 |
| 4 | 100 | 35 | 15.8 | 168 | 76 | 204 | 93 | 142 | 64 | 184 | 83 | 87 | 39 | 109 | 50 |
| 6 | 150 | 63 | 29 | 280 | 127 | 338 | 153 | 250 | 114 | 308 | 140 | 150 | 68 | 180 | 82 |
| 8 | 200 | 177 | 80 | 565 | 256 | 647 | 293 | 525 | 238 | 593 | 269 | 347 | 112 | 393 | 178 |
| 10 | 250 | 177 | 80 | 769 | 349 | 865 | 392 | 717 | 325 | 807 | 366 | 443 | 200 | 501 | 227 |
| MODEL 350AST SIZE | DIMENSION (approximate) | ||||||||||||||||||||||
| A | A WITH BUTTERFLY | B LESS GATE VALVES | C | D | E NRS GATE | 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 | in. | mm |
| 2 1/2 | 65 | 31 7/8 | 810 | 28 3/4 | 730 | 16 5/8 | 422 | 4 1/2 | 114 | 7 1/4 | 184 | 11 1/2 | 292 | 17 3/4 | 451 | 15 3/8 | 391 | 8 1/4 | 210 | 5 | 127 | 42 | 1067 |
| 3 | 80 | 32 7/8 | 835 | 29 3/8 | 746 | 16 5/8 | 422 | 4 1/2 | 114 | 7 1/4 | 184 | 12 3/4 | 324 | 20 1/4 | 514 | 17 | 432 | 8 1/4 | 210 | 5 | 127 | 43 1/2 | 1105 |
| 4 | 100 | 34 7/8 | 886 | 30 1/4 | 768 | 16 5/8 | 422 | 4 1/2 | 114 | 8 | 203 | 14 1/2 | 368 | 22 1/2 | 572 | 18 1/4 | 464 | 9 | 229 | 5 | 127 | 50 | 1270 |
| 6 | 150 | 43 1/2 | 1105 | 36 1/2 | 927 | 22 1/4 | 565 | 5 1/2 | 140 | 10 | 254 | 18 | 457 | 30 1/2 | 775 | 24 1/4 | 616 | 10 1/4 | 260 | 6 | 152 | 61 5/8 | 1565 |
| 8 | 200 | 52 3/4 | 1340 | 45 3/4 | 1162 | 29 1/2 | 749 | 9 1/4 | 235 | 11 | 279 | 21 1/8 | 537 | 37 | 940 | 28 1/2 | 724 | 18 1/2 | 470 | 8 3/8 | 213 | 77 1/8 | 1959 |
| 10 | 250 | 55 3/4 | 1416 | 49 3/4 | 1264 | 29 1/2 | 749 | 9 1/4 | 235 | 12 | 305 | 24 3/4 | 629 | 45 5/8 | 1159 | 34 3/4 | 883 | 18 1/2 | 470 | 8 3/8 | 213 | 85 3/8 | 2169 |
Flow Characteristics
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 |
INDOOR INSTALLATION
(350AST with ZCSM-PF Connected Pressure Monitor and ZCSM-BTM Connected Flow Meter accessories)
Specifications
The Double Check Backflow Prevention Assembly shall be certified to NSF/ANSI/CAN 61, ASSE® Listed 1015, and supplied with full port gate valves. The main body and access cover shall be 304L Stainless Steel, 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 checks shall be accessible for maintenance without removing the device from the line. The Double Check Backflow Prevention Assembly shall be a ZURN WILKINS Model 350AST.
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
Documents / Resources
 |
ZURN 350AST Double Check Valve Assembly [pdf] Installation Guide 350AST Double Check Valve Assembly, 350AST, Double Check Valve Assembly, Check Valve Assembly, Valve Assembly |
