ZURN 375L Reduced Pressure Principle Backflow Preventer Installation Guide
- October 31, 2023
- ZURN
Table of Contents
Model 375
Reduced Pressure Principle Assembly
Application
Designed for installation on potable water lines to protect against both
backsiphonage and backpressure of contaminated water into the potable water
supply.
The Model 375
provides protection where a potential health hazard exists.
Ideal for use where lead-free* valves are required.
Standards Compliance
(Unless Otherwise Noted, Sizes 2 1/2″ Thru 10″)
- ASSE® Listed 1013
- cUPC® Listed
- CSA® Certified B64.4 (2 1/2″ thru 8″)
- AWWA Compliant C511, and C550
- FM® Approved
- UL® Classified
- C-UL® Classified
- NYC MEA 49-01-M Vol 2
- 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 | 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 |
| Seal rings | EPDM (FDA approved) |
| O-rings | Buna Nitrile (FDA approved) |
| Springs | Stainless Steel, 300 Series |
| Sensing line | Stainless Steel, braided hose |
Features
Sizes: 2 1/2″, 3″, 4″, 6″, 8″, 10″
Maximum working water pressure
Maximum working water temperature
Hydrostatic test pressure
End connections (Grooved for steel pipe) (Flanged)| 175 PSI
140°F
350 PSI
AWWA C606
ANSI
B16.42
Class
150
---|---
Attention:
Model 375 (flange body) and Model 375A
(grooved body) have different lay lengths.
Options
(Suffixes can be combined)
… – with NRS shut-off valves (standard)
… FSC – with epoxy coated wye type strainer (flanged only)
… G – with grooved end NRS gate valves
… GF – with grooved inlet connection and flanged outlet connection
… FG – with flanged inlet connection and grooved outlet connection
… L – less shut-off valves (flanged body connections)
… OSY – with OS&Y gate valves
… PI – with Post Indicator gate valve
… BG – with grooved end butterfly valves with integral supervisory switches
*New Connected Products. Search ZCSM-PFonZurn.com for details.
Accessories
… Connected Pressure Monitor (Model ZCSM-PF)
… Connected Flow Meter Option (Model ZCSM-BTM must be ordered with Model ZCSM-
PF)
… OS & Y Gate valve tamper switch (OSY-40
… Air gap (Model AG)
… QT-SET Quick Test Fitting Set
… Repair kit (rubber only)
… Thermal expansion tank (Model XT)
… Wireless Monitor Retrofit Kit for conversion of existing model 375 (212-6
-RFK-375W1, 8-10-RFK-375W1) Relief Valve discharge port:
2 1/2″ – 6″ – 2.75 sq. in.
8″ – 10″ – 3.69 sq. in.
Dimensions & Weights (do not include pkg.)
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.
INDOOR INSTALLATION
(375OSY with ZCSM-PF Connected Pressure Monitor and ZCSM-BTM Connected Flow
Meter accessories)
Capacity thru Schedule 40 Pipe (GPM)
Pipe size| 5 ft/sec| 7.5 ft/sec| 10 ft/sec| 15 ft/sec
21/2″| 75| 112| 149| 224
3°| 115| 1/3| 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
OUTDOOR INSTALLATION
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 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 checks and the relief valve shall be accessible for maintenance without removing the device from the line. The Reduced Pressure Principle Backflow Prevention Assembly shall be a ZURN WILKINS Model 375.
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