Description
Zurn Wilkins 6-350AOSY 6" Double Check Valve Assembly
The Zurn Wilkins 6-350AOSY is a lead-free 6-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 6-350AOSY 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 delivers 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 exceptional durability and corrosion resistance.
The 6-350AOSY is certified to numerous industry standards, making it an ideal 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 systems requiring low-lead compliance.
- ✓ Compound Check® Technology: Delivers reliable backflow protection with exceptionally low pressure loss.
- ✓ Short Lay Length: Simplifies retrofit installations and replacement projects.
- ✓ Full-Port OS&Y Gate Valves: Provide positive shutoff with visible valve position indication.
- ✓ Epoxy-Coated Ductile Iron Body: Offers outstanding corrosion resistance and long service life.
- ✓ Serviceable In-Line Design: Internal check assemblies can be serviced without removing the valve body.
- ✓ Stainless Steel Internal Components: Resist corrosion and provide 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: Built for demanding commercial, municipal, and industrial applications.
Product Applications
- Commercial buildings
- Industrial facilities
- Municipal water distribution systems
- Institutional buildings
- Hospitals and healthcare facilities
- Schools and universities
- Irrigation systems
- Fire protection water supply systems
- Mechanical equipment rooms
- Potable water distribution systems
Ideal For
- Commercial plumbing contractors
- Municipal infrastructure projects
- Mechanical consulting engineers
- Industrial facilities
- Building maintenance departments
- Retrofit and replacement projects
- Lead-free potable water systems
What's Included
- Zurn Wilkins 6-350AOSY 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-coated finish
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 | 6-350AOSY |
| Product Type | Double Check Valve Assembly (DCVA) |
| Valve Size | 6 in (152 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 hazard classification.
- Install according to all local plumbing, fire protection, and cross-connection control requirements.
- Mount the assembly between 12 inches and 30 inches (305 mm to 762 mm) above an adequate floor drain where required.
- Ensure the assembly cannot become submerged during operation.
- Provide sufficient side and overhead clearance for testing, inspection, and maintenance.
- Flush upstream piping before installation to remove construction debris.
- Support adjacent piping to prevent excessive stress on the valve body.
- Arrange for commissioning and testing by a certified backflow tester where required.
Frequently Asked Questions
Q: What is the Zurn Wilkins 6-350AOSY used for?
A: It protects commercial potable water systems from backsiphonage and backpressure involving polluted water where a health hazard does not exist.
Q: Is the 6-350AOSY lead-free?
A: Yes. The assembly is certified to NSF/ANSI 372 for compliance with lead-free potable water requirements.
Q: Can the internal check assemblies be serviced without removing the valve?
A: Yes. The Compound Check® modules are designed for in-line servicing, reducing maintenance time and downtime.
Q: What does OS&Y stand for?
A: Open Stem & Yoke. The rising stem provides a visible indication of whether the gate valves are open or closed.
Q: What type of connections does this valve use?
A: 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 valve be installed vertically?
A: Yes. Horizontal and vertical installations are permitted where approved by local plumbing codes and the authority having jurisdiction.
Q: What maintenance is required?
A: Annual testing and periodic inspection should be performed in accordance with local regulations. Internal checks and shutoff valves should be serviced as required.
Q: Where is the 6-350AOSY commonly installed?
A: It is commonly installed in commercial buildings, hospitals, schools, municipal water systems, industrial facilities, irrigation systems, and mechanical equipment rooms.
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 for your application.
- ✓ Genuine Zurn Wilkins products
- ✓ Expert commercial plumbing support
- ✓ Fast shipping throughout North America
- ✓ Competitive contractor pricing
- ✓ Access to repair kits and replacement components
Recommended Related Products
- Zurn Wilkins Reduced Pressure Principle Backflow Preventers
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- Replacement check assemblies
- Commercial backflow test kits
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