ZURN 375AST Reduced Pressure Principle Assembly Instruction Manual
- June 13, 2024
- ZURN
Table of Contents
ZURN 375AST Reduced Pressure Principle Assembly
Product Information
The Model 375AST is a Reduced Pressure Principle Assembly designed for installation on potable water lines. It provides protection against both backsiphonage and backpressure of contaminated water into the potable water supply. This assembly is ideal for use where lead-free valves are required. It is compliant with NSF/ANSI/CAN 61 standards and has been tested by Hydraulic Research at the University of Southern California. The main valve body and access covers are made of 304L stainless steel, and the coatings are FDA approved electrostatic epoxy. The internals of the assembly are made of stainless steel, 300 series NORYLTM, and the fasteners & springs are made of stainless steel, 300 series. The seal rings are made of EPDM (FDA approved), and the O-rings are made of Buna Nitrile (FDA approved). The assembly is available insizes 2 1/2, 3, 4, 6, 8, and 10. It has a maximum working water pressure of 175 PSI and a maximum working water temperature. The hydrostatic test pressure is 350 PSI. The end connections are grooved for steel pipe according to AWWA C606 standards.
Product Usage Instructions
- Ensure that the potable water line where the Model 375AST will be installed is clean and free from any contaminants.
- Select the appropriate size of the assembly based on the pipe diameter of the potable water line.
- Install the assembly in-line with the potable water line, following the manufacturer’s instructions for proper alignment and orientation.
- Securely connect the assembly to the potable water line using compatible fittings or couplings.
- If additional options are required, such as flanged end NRS gate valves or epoxy coated wye type strainer, select the appropriate suffixes and install them according to the manufacturer’s instructions.
- Once the assembly is installed, check for any leaks or loose connections. Tighten any fittings if necessary.
- Periodically inspect the assembly for any signs of damage or wear. Replace any damaged or worn components as needed.
- If the assembly is equipped with a pressure monitor, flow meter option, or other accessories, follow the manufacturer’s instructions for their installation and operation.
- Keep the area around the assembly clear and accessible for maintenance and repair purposes.
Application
Designed for installation on potable water lines to protect against both
backsiphonage and backpressure of contami-nated water into the potable water
supply. The Model 375AST provides protection where a potential health hazard
exists. Ideal for use where lead-free* valves are required.
Standards Compliance
- ASSE® Listed 1013
- AWWA Compliant C511 (with gates only), and C550
- FM® Approved
- UL® Classified
- C-UL® Classified
- CSA® Certified B64.4
- cUPC® Listed
- Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern Cali- fornia
- 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
- Coatings FDA Approved electrostatic epoxy finish
- Internals Stainless steel, 300 Series NORYL™
- Fasteners & Springs Stainless Steel, 300 Series
- Seal rings EPDM (FDA approved)
- O-rings Buna Nitrile (FDA approved)
- Sensing line Stainless Steel, braided hose
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 bolt pattern) ASME B16.42
Dimensions & Weights (do not include pkg.)
| MODEL 375AST SIZE | WEIGHT |
|---|---|
| WITH- OUT GATES | WITH NRS GATES (GXF) |
| (GXG) | WITH OS&Y GATES (GXG) |
VALVES (GXF)
in.| mm| lbs.| kg| lbs.| kg| lbs.| kg| lbs.| kg| lbs.| kg| lbs.| kg| lbs.| kg
2 1/2| 65| 41| 19| 102| 46| 120| 54| 92| 42| 110| 50| 87| 39| 97| 44
3| 80| 42| 19| 119| 54| 137| 62| 107| 49| 125| 57| 91| 41| 104| 47
4| 100| 43| 20| 176| 80| 212| 96| 156| 71| 192| 87| 95| 43| 117| 53
6| 150| 71| 32| 288| 130| 346| 157| 258| 117| 316| 143| 158| 71| 188| 85
8| 200| 177| 80| 579| 263| 661| 300| 539| 244| 607| 275| 361| 164| 407| 185
10| 250| 177| 80| 784| 356| 880| 399| 732| 332| 822| 373| 458| 208| 516| 234
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 – with flanged end OS&Y gate valves
- OSYG – with grooved end OS&Y gate valves
- BG – with grooved end butterfly valves with integral supervisory switches
- BF – with flanged end butterfly valves with integral supervisory switches
*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)
- Air gap (Model AG)
- QT-SET Quick Test Fitting Set
- Wireless Monitor Retrofit Kit for conversion of existing model 375 (212-6-RFK-375W1, 8-10-RFK-375W1)
| MODEL 375AST SIZE | DIMENSION (approximate) |
|---|---|
| A | A WITH BUTTERFLY VALVES |
E OS&Y
CLOSED
| E WITH
BUTTERFLY VALVES
| F| G| H
in.| mm| 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| 9 3/4| 248| 8 5/8| 219| 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| 9 3/4| 248| 8 5/8| 219| 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| 9 3/4| 248| 8 5/8| 219| 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| 10 3/4| 273| 11 1/4| 286| 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| 15 5/8| 397| 13 1/4| 337| 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| 15 5/8| 397| 13 1/2| 343| 85 3/8|
2169
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
| Rev. N Date: 12/22
- Document No. BF-375AST Product No.
- Model 375AST
- Patent zurn.com/patents
Flow Characteristics
MODEL 375AST 2 1/2″, 3″ & 4″ (STANDARD & METRIC)
MODEL 375AST 6″, 8″ & 10″ (STANDARD AND 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 test-ing 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
(375AST with ZCSM-PF Connected Pressure Monitor and ZCSM-BTM Connected Flow
Meter accessories)
Specifications
The Reduced Pressure Principle Backflow Prevention Assembly shall be certified
to NSF/ANSI/CAN 61, ASSE® Listed 1013, 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 and the relief
valve shall be accessible for maintenance without removing the device from the
line. The Reduced Pres-sure Principle Backflow Prevention Assembly shall be a
ZURN WILKINS Model 375AST.
- 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
References
- Zurn | Engineered Water Solutions for Plumbing, Drainage
- Zurn | Engineered Water Solutions for Plumbing, Drainage
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