Description
Zurn Wilkins 212-350AOSY 2-1/2" Double Check Valve Assembly
The Zurn Wilkins 212-350AOSY is a lead-free 2-1/2-inch Double Check Valve Assembly designed to protect potable water systems from backpressure and backsiphonage in non-health hazard applications. It combines a durable epoxy-coated ductile iron body, low-headloss Compound Check technology, flanged connections, and full-port OS&Y gate valves.
Product Overview
The Zurn Wilkins 212-350AOSY Double Check Valve Assembly provides dependable backflow protection for commercial, industrial, institutional, municipal, irrigation, and fire protection water systems where a potential health hazard does not exist.
This factory-assembled backflow preventer features full-port OS&Y, or Open Stem and Yoke, gate valves that provide positive shutoff and clear visual indication of valve position. Its short lay length can simplify replacement installations by reducing the amount of piping modification required.
The epoxy-coated ductile iron body is engineered for durability and corrosion resistance in demanding mechanical room and utility applications. Internal components include stainless steel hardware, NORYL check components, EPDM sealing materials, and FDA-approved elastomers.
Zurn Wilkins Compound Check technology is designed to provide reliable backflow protection with low pressure loss. The internal check assemblies are accessible for inspection and maintenance without removing the complete device from the pipeline, helping reduce service time and system downtime.
The 212-350AOSY is suitable for lead-free potable water installations and is certified or listed to multiple recognized plumbing, waterworks, fire protection, and cross-connection control standards.
Features & Benefits
- ✓ Lead-Free Compliance: Certified to NSF/ANSI 372 for use in potable water applications requiring low-lead components.
- ✓ Compound Check Technology: Engineered to provide dependable backflow protection while minimizing pressure loss through the assembly.
- ✓ Short Lay Length: Compact face-to-face dimensions can simplify replacement projects and reduce piping modifications.
- ✓ Full-Port OS&Y Gate Valves: Provide reliable isolation and clear visual indication of the open or closed valve position.
- ✓ Epoxy-Coated Ductile Iron Body: Delivers strength, corrosion resistance, and long service life in commercial installations.
- ✓ In-Line Serviceability: Internal check components can be accessed for maintenance without removing the assembly from the pipe.
- ✓ Stainless Steel Internals: Corrosion-resistant stems, springs, and fasteners support dependable long-term performance.
- ✓ Flanged End Connections: ANSI Class 125 flanged connections support secure installation in larger commercial piping systems.
- ✓ Horizontal or Vertical Installation: Approved configurations provide flexibility where permitted by local codes and authorities.
- ✓ Broad Standards Compliance: Listed, certified, classified, or approved by multiple recognized industry organizations.
Product Applications
- Commercial potable water systems
- Institutional plumbing systems
- Municipal water distribution systems
- Industrial facilities
- Office and mixed-use buildings
- Schools and educational facilities
- Irrigation supply systems
- Fire protection water supply lines
- Mechanical rooms
- Non-health hazard cross-connection control applications
Ideal For
- New commercial construction
- Replacement of existing 2-1/2-inch DCVA assemblies
- Potable water systems requiring lead-free components
- Applications requiring flanged connections
- Systems requiring visible OS&Y shutoff valve positioning
- Installations where low pressure loss is important
- Facilities requiring an in-line serviceable backflow assembly
What's Included
- Zurn Wilkins Model 212-350AOSY Double Check Valve Assembly
- Factory-installed full-port OS&Y gate valves
- Dual internal check assemblies
- Test cocks
- 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 by IAPMO R&T
- ✓ NSF/ANSI 61 Annex G Listed
- ✓ CSA Certified
- ✓ UL Classified
- ✓ C-UL Classified
- ✓ FM Approved
- ✓ NYC MEA 220-04-M Volume 2 approved for applicable sizes
- ✓ Approved by the USC Foundation for Cross-Connection Control and Hydraulic Research
Specifications
| Specification | Details |
| Brand | Zurn Wilkins |
| Model | 350AOSY |
| Part Number | 212-350AOSY |
| Product Type | Double Check Valve Assembly |
| Valve Size | 2-1/2 in / 63.5 mm |
| Connection Type | 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 Components | NORYL |
| Stem Material | Stainless steel, ASTM A276 |
| Fasteners and Springs | 300 Series stainless steel |
| Seal Ring Material | FDA-approved EPDM |
| O-Ring Material | FDA-approved Buna-N nitrile |
| 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 where approved |
| Lead-Free Compliance | NSF/ANSI 372 certified |
Installation Tips
- Confirm that a Double Check Valve Assembly is permitted for the degree of hazard and intended application.
- Follow all local plumbing, fire protection, water authority, and cross-connection control requirements.
- Install the assembly in an accessible location that allows sufficient room for testing, inspection, and maintenance.
- Unless otherwise specified by the authority having jurisdiction, mount the assembly between 12 inches and 30 inches above an adequate drain.
- Maintain approximately 305 mm to 762 mm of elevation above the drain or finished surface where required.
- Ensure no part of the assembly can become submerged during normal operation or flooding.
- Support the connected piping properly so the assembly is not carrying excessive pipe weight or mechanical stress.
- Flush the upstream piping before installation to remove dirt, scale, and construction debris.
- Verify that flange faces are aligned and tighten flange hardware evenly using an appropriate cross-pattern.
- Provide adequate side and top clearance for removal of access covers and internal check components.
- Arrange for commissioning and field testing by a certified backflow tester where required.
Frequently Asked Questions
Q: What does the Zurn Wilkins 212-350AOSY protect against?
A: It protects potable water systems from backpressure and backsiphonage involving polluted water in applications where a potential health hazard does not exist.
Q: Is the 212-350AOSY suitable for health hazard applications?
A: No. Applications involving contaminants that could create a health hazard generally require a Reduced Pressure Principle Backflow Prevention Assembly, subject to local code requirements.
Q: What does OS&Y mean?
A: OS&Y means Open Stem and Yoke. The rising stem provides a visible indication of whether each gate valve is open or closed.
Q: Is the Zurn Wilkins 212-350AOSY lead-free?
A: Yes. The assembly is certified to NSF/ANSI 372 for compliance with lead-free potable water requirements.
Q: What type of connections does this model use?
A: The 212-350AOSY uses 2-1/2-inch ANSI B16.1 Class 125 flanged end connections.
Q: Can the internal checks be serviced without removing the assembly?
A: Yes. The access cover and internal check components are designed to be serviced while the main valve body remains installed in the pipeline.
Q: What is the maximum working pressure?
A: The maximum working water pressure is 175 psi, equivalent to approximately 12.1 bar.
Q: What is the maximum operating temperature?
A: The maximum working water temperature is 140°F, equivalent to 60°C.
Q: Can this double check valve assembly be installed vertically?
A: The assembly is approved for horizontal and vertical installation configurations where permitted by local codes and the authority having jurisdiction.
Q: What maintenance does the 212-350AOSY require?
A: The assembly should be tested and inspected at the intervals required by the local water authority. Internal checks, seals, test cocks, and shutoff valves should be serviced as needed.
Q: What is the benefit of Compound Check technology?
A: Compound Check technology is designed to maintain reliable backflow protection while reducing pressure loss through the assembly.
Q: Is this assembly supplied with shutoff valves?
A: Yes. The 212-350AOSY includes factory-installed full-port OS&Y gate valves.
Why Buy From MasterBuilder Mercantile
MasterBuilder Mercantile supplies genuine commercial plumbing and backflow prevention products for contractors, facilities, engineers, municipalities, and building owners. Our team can help verify product size, connection type, application requirements, and replacement compatibility before ordering.
- ✓ Genuine Zurn Wilkins products
- ✓ Knowledgeable commercial plumbing support
- ✓ Canada-wide and cross-border shipping options
- ✓ Support for replacement and new-construction applications
- ✓ Access to repair parts and related backflow products
Recommended Related Products
- Zurn Wilkins 350A replacement check assemblies
- Zurn Wilkins 350A seal and rubber repair kits
- Replacement test cocks
- Backflow testing equipment
- Reduced Pressure Principle Backflow Prevention Assemblies
- Commercial strainers and isolation valves
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