Description
Zurn Wilkins 3-350AOSY 3" Double Check Valve Assembly
The Zurn Wilkins 3-350AOSY is a lead-free 3-inch Double Check Valve Assembly (DCVA) designed to protect potable water systems against backpressure and backsiphonage in non-health hazard applications. Featuring a durable epoxy-coated ductile iron body, Compound Check® technology, ANSI Class 125 flanged connections, and full-port OS&Y (Open Stem & Yoke) gate valves, this commercial-grade backflow preventer delivers dependable performance, low pressure loss, and simplified maintenance.
Product Overview
The Zurn Wilkins 3-350AOSY Double Check Valve Assembly provides reliable backflow protection for commercial, institutional, industrial, municipal, irrigation, and fire protection water systems where protection against polluted, non-health hazard water is required.
Designed with a rugged epoxy-coated ductile iron body and full-port OS&Y gate valves, the assembly offers long service life and dependable performance in demanding commercial plumbing systems. The patented Compound Check® design minimizes pressure loss while maintaining reliable protection of potable water supplies.
The compact lay length helps simplify replacement installations by reducing piping modifications, while the serviceable internal check modules allow maintenance without removing the complete valve body from the pipeline. Stainless steel internal components, NORYL™ check modules, EPDM elastomers, and FDA-approved materials provide long-lasting durability and corrosion resistance.
The 3-350AOSY is certified to numerous industry standards, making it an excellent choice for engineers, contractors, municipalities, and facility managers seeking dependable lead-free backflow protection.
Features & Benefits
- ✓ Lead-Free Construction: Certified to NSF/ANSI 372 for potable water applications requiring low-lead compliance.
- ✓ Compound Check® Technology: Provides dependable backflow protection while minimizing pressure loss.
- ✓ Short Lay Length: Simplifies retrofit installations and replacement projects.
- ✓ Full-Port OS&Y Gate Valves: Offer positive shutoff with visible valve position indication.
- ✓ Epoxy-Coated Ductile Iron Body: Provides exceptional corrosion resistance and long service life.
- ✓ Serviceable In-Line Design: Internal check assemblies can be serviced without removing the valve from the pipeline.
- ✓ Stainless Steel Internal Components: Resist corrosion and support dependable long-term operation.
- ✓ ANSI Class 125 Flanged Connections: Designed for secure installation in commercial piping systems.
- ✓ Horizontal or Vertical Installation: Approved where permitted by local plumbing codes.
- ✓ Commercial-Grade Reliability: Engineered for demanding commercial and municipal water systems.
Product Applications
- Commercial buildings
- Institutional facilities
- Industrial process water systems
- Municipal water distribution
- Schools and universities
- Hospitals and healthcare facilities
- Irrigation systems
- Fire protection water supply systems
- Mechanical equipment rooms
- Potable water distribution systems
Ideal For
- Commercial plumbing contractors
- Municipal infrastructure projects
- Building maintenance departments
- Mechanical consulting engineers
- New commercial construction
- Retrofit and replacement installations
- Lead-free potable water systems
What's Included
- Zurn Wilkins 3-350AOSY Double Check Valve Assembly
- Factory-installed full-port OS&Y gate valves
- Dual Compound Check® assemblies
- Factory-installed test cocks
- ANSI Class 125 flanged end connections
- Factory-applied epoxy coating
Certifications & Compliance
- ✓ ASSE 1015 Listed
- ✓ AWWA C510 Compliant (with gate valves)
- ✓ AWWA C550 Compliant
- ✓ IAPMO Listed
- ✓ NSF/ANSI 372 Certified
- ✓ NSF/ANSI 61 Annex G Listed
- ✓ CSA Certified
- ✓ UL Classified
- ✓ C-UL Classified
- ✓ FM Approved
- ✓ NYC MEA Approved (applicable sizes)
- ✓ Approved by the USC Foundation for Cross-Connection Control and Hydraulic Research
Specifications
| Specification | Details |
| Brand | Zurn Wilkins |
| Model | 350AOSY |
| Part Number | 3-350AOSY |
| Product Type | Double Check Valve Assembly (DCVA) |
| Valve Size | 3 in (76 mm) |
| End Connections | ANSI B16.1 Class 125 Flanged |
| Shutoff Valves | Full-Port OS&Y Gate Valves |
| Main Body Material | Ductile Iron ASTM A536 Grade 4 |
| Access Cover Material | Ductile Iron ASTM A536 Grade 4 |
| Body Coating | FDA-approved electrostatic epoxy finish |
| Check Material | NORYL™ |
| Stem Material | Stainless Steel ASTM A276 |
| Fasteners & Springs | 300 Series Stainless Steel |
| Seal Material | FDA-approved EPDM |
| O-Ring Material | FDA-approved Buna-N |
| Maximum Working Pressure | 175 psi (12.1 bar) |
| Hydrostatic Test Pressure | 350 psi (24.1 bar) |
| Maximum Working Temperature | 140°F (60°C) |
| Installation Orientation | Horizontal or Vertical |
| Lead-Free Compliance | Certified to NSF/ANSI 372 |
Installation Tips
- Verify that a Double Check Valve Assembly is approved for the intended application and degree of hazard.
- Install according to all local plumbing, mechanical, and cross-connection control requirements.
- Mount the assembly between 12 in and 30 in (305 mm to 762 mm) above an adequate floor drain where required.
- Ensure the assembly cannot become submerged during operation.
- Allow adequate side and overhead clearance for annual testing and maintenance.
- Flush the water line before installation to remove debris.
- Properly support adjacent piping to prevent unnecessary stress on the valve body.
- Arrange for testing by a certified backflow tester after installation where required.
Frequently Asked Questions
Q: What is the Zurn Wilkins 3-350AOSY used for?
A: It protects potable water systems from backsiphonage and backpressure involving polluted water in non-health hazard applications.
Q: Is this valve lead-free?
A: Yes. The assembly is certified to NSF/ANSI 372 for lead-free potable water applications.
Q: Can the internal checks be serviced without removing the valve?
A: Yes. The internal check assemblies are designed for in-line servicing, helping reduce maintenance time.
Q: What does OS&Y mean?
A: Open Stem & Yoke gate valves provide positive shutoff and a visible indication of whether the valve is open or closed.
Q: What are the connection types?
A: This model features ANSI B16.1 Class 125 flanged end connections.
Q: What is the maximum working pressure?
A: 175 psi (12.1 bar).
Q: What is the maximum operating temperature?
A: 140°F (60°C).
Q: Can this assembly be installed vertically?
A: Yes, where permitted by local plumbing codes and the authority having jurisdiction.
Why Buy From MasterBuilder Mercantile
MasterBuilder Mercantile supplies genuine Zurn Wilkins commercial plumbing products backed by knowledgeable customer support and fast shipping. Whether you're replacing an existing backflow preventer or specifying equipment for a new construction project, our experienced team can help you select the right solution.
- ✓ Genuine Zurn Wilkins products
- ✓ Commercial plumbing expertise
- ✓ Fast shipping across North America
- ✓ Competitive contractor pricing
- ✓ Access to replacement parts and repair kits
Recommended Related Products
- Zurn Wilkins Reduced Pressure Principle Backflow Preventers
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- Replacement check assemblies
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