Zurn Wilkins 8-350AOSY | 8″ Double Check Valve Assembly with OS&Y Gate Valves
Product Overview
The Zurn Wilkins 8-350AOSY is a high-performance double check valve assembly (DCVA) designed to prevent backflow in potable water systems. Built with a compact lay length and robust construction, this 8″ backflow preventer features outside stem & yoke (OS&Y) flanged end gate valves, making it ideal for commercial, municipal, and institutional installations that require high-capacity flow and lead-free compliance.
Key Features & Benefits
-
Efficient Backflow Protection
Utilizes a dual Compound Check® design to maintain low headloss and reliable protection from backsiphonage and backpressure. -
Lead-Free Certified
Fully compliant with low-lead laws and safety standards for use in potable water systems. -
Compact & Easy to Install
Short body length allows for easier replacement and integration into existing systems, even in tight mechanical rooms. -
Durable Construction
Features a ductile iron body with a corrosion-resistant epoxy coating, stainless steel internals, and NSF-listed NORYL™ components. -
Service-Friendly Design
Check assemblies are accessible from a single access cover, allowing for in-line maintenance without removing the device. -
OS&Y Gate Valves
Full port OS&Y gate valves provide smooth operation, secure shutoff, and visual verification of valve position.
Technical Specifications
| Specification | Details |
|---|---|
| Size | 8″ |
| Body Material | Epoxy-coated ductile iron |
| Check Design | Dual Compound Check® |
| End Connections | Flanged (ANSI B16.1 Class 125) |
| Operating Pressure | 175 PSI max |
| Operating Temp | 140°F max |
| Test Pressure | 350 PSI |
| Seals & Elastomers | EPDM, Buna-N (FDA approved) |
| Internals | Stainless steel and NORYL™ |
| Mounting | Horizontal or vertical |
| Service Access | Single cover access for both checks |
Applications
Designed for installation on potable water lines in locations where backflow protection is needed but a potential health hazard is not present. Common in schools, office buildings, shopping centers, and other large facilities. Can be used in both new installations and retrofit projects where space is limited and quick servicing is important.
Frequently Asked Questions
Q: Can this assembly be installed vertically?
Yes, the valve supports both horizontal and vertical orientations depending on site requirements.
Q: What kind of maintenance is needed?
Routine inspection and occasional internal servicing via the access cover—no need to remove from the line.
Q: Are the gate valves included?
Yes, the unit includes full port flanged OS&Y gate valves for complete shutoff and backflow control.
Q: Is this backflow preventer lead-free?
Yes, it complies with all current lead-free regulations and certifications for use in potable water systems.
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