If you need reliable backflow prevention, a double check valve backflow prevention assembly is a solid choice for preventing back-siphonage and backpressure in non-health-hazard applications. This guide identifies five top options, who they’re best for, and what to watch for during installation. The featured products suit irrigation systems, service entrances, and outdoor piping where continuous pressure is maintained. The following buying table highlights essential at-a-glance details to help you compare quickly.
| Product | Best For | Key Benefit |
|---|---|---|
| Zurn Wilkins 34-350 3/4″ 350 | Residential and small commercial irrigation | Detachable pressure vessel for fast maintenance |
| Onylraep 34-350 3/4″ | Contractors needing offline serviceability | Detachable vessel and robust outdoor build |
| Wilkins 1-350 1″ | Mid-size irrigation and service line points | Flush Tool and offline serviceability |
| Watts LF007 Series 3/4″ | Lead-free, potable water systems | Freeze sensor compatibility for monitoring |
| Feeligivin 34-350 3/4″ | Versatile outdoor applications | Corrosion-resistant, removable valve body |
Zurn Wilkins 34-350 3/4″ 350 Double Check Backflow Preventer
The Zurn Wilkins 34-350 is a 3/4″ double check backflow preventer designed for continuous-pressure piping. Its detachable pressure vessel supports offline maintenance, reducing service time. This model emphasizes water savings through a compact, serviceable design that keeps the flow path efficient during normal operation.
Best for: Small irrigation setups and service entries where quick maintenance is valuable. The detachable vessel is ideal for contractors who want faster turnarounds on field repairs. A potential limitation is the need for proper calibration during reassembly to maintain isolation integrity.
34-350 3/4″ 350 Double Check Backflow Preventer, Onylraep
Onylraep’s 34-350 features a detachable pressure vessel for easier maintenance and offline serviceability, with a focus on preventing backflow due to backpressure and back-siphonage. Its stainless steel and reinforced nylon construction aims for durability in outdoor environments. The design suits irrigation contractors needing a robust, serviceable unit that can handle frequent maintenance.
Best for: Contractors seeking a dependable, off-line serviceable backflow preventer. Consider this if you value a detachable vessel and extended service life in exposed outdoor installations. Caution: verify compatibility with your existing piping threads and ensure proper valve alignment during reassembly.
Wilkins 1-350 1″ 350 Double Check Backflow Preventer
This 1″ model from Wilkins extends the brand’s focus on Easy Maintenance with an integrated flush tool to simplify line flushing and a removable pressure vessel for quicker service. It also supports offline serviceability, which helps keep projects on schedule in field conditions.
Best for: Medium-sized irrigation systems or service entrances needing straightforward maintenance and water-saving design. Limitation: larger size may require space considerations in tight installations.
Watts LF007 Series 3/4″ Lead-Free Double Check Valve Backflow Preventer
The Watts LF007 series uses lead-free copper-silicon alloy for the body, providing long-term durability while maintaining compliance with drinking water standards. It features NPT connections, quarter-turn shutoffs, top-mounted test cocks, two inline check modules, and a freeze sensor compatible with monitoring systems. The design supports continuous-pressure piping and cross-connection protection.
Best for: Installations prioritizing lead-free materials and modern sensing capabilities. Choose this if you value a freeze sensor and modular design for future upgrades. Limitation: the additional features may require careful installation alignment for optimal performance.
Feeligivin 34-350 3/4″ Double Check Backflow Preventer
Feeligivin’s 34-350 offers a cast bronze main body with a UV-resistant nylon housing and stainless steel hardware, delivering corrosion resistance and durability for outdoor environments. It includes a removable valve body for quick servicing and is designed to prevent both backpressure and backsiphonage effectively.
Best for: Outdoor installations where durability and ease of maintenance are priorities. Limitation: ensure compatibility with existing pipe sizes and verify that your environment suits bronze and nylon materials.
Buying Guide: Key Considerations For Double Check Backflow Assemblies
- Application and code compliance: Ensure the assembly is suitable for non-health-hazard applications and complies with your local water authority requirements.
- Material and durability: Lead-free construction and corrosion resistance are important for exposed outdoor use; bronze, stainless steel, and reinforced nylon offer longevity.
- Maintenance access: Detachable pressure vessels or removable components can significantly cut service time; confirm offline serviceability if you expect frequent maintenance.
- Pressure and size: Match the valve size to your piping (3/4″ vs 1″); consider flow requirements and pressure loss across the device.
- Monitoring and safety features: Freeze sensors or test cocks can improve safety and testability in field operations.
- Installation space: Some units require space for service and tools like flush tools; plan the installation footprint accordingly.
- Warranty and support: While not specified here, check for manufacturer support and local availability of replacement parts.
FAQ: Quick Answers For Buyers
- What is a double check backflow preventer used for? It protects potable water from backflow due to backpressure or backsiphonage in continuous-pressure piping systems.
- Do these come with lead-free options? Yes, several models use lead-free copper silicon alloys for compliance with water safety standards.
- What maintenance features should I look for? Detachable pressure vessels, offline serviceability, and flush tools help reduce maintenance time.
- Is a bigger size always better? Not necessarily; select the size to fit your piping and desired flow, balancing pressure loss and installation space.
- Do these protect against all backflow types? They protect primarily against backpressure and backsiphonage in non-health-hazard applications; for health-related systems, different equipment may be required.
- What should I verify before purchasing? Material compatibility, connection type (NPT), size, presence of a freeze sensor if needed, and whether a quick-maintenance design is important to you.
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