Best 2-Inch Double Check Valves for Backflow Prevention
Protecting potable water supplies starts with reliable backflow prevention. This guide highlights top 2-inch double check valve assemblies used in non-health hazard applications, featuring metal bodies, modular designs, and easy maintenance. Each option adheres to common plumbing standards and offers robust shutoffs, test cocks, and inline servicing. Use this overview to compare construction, materials, and freezing protection capabilities across copper silicon alloy, bronze, and mixed configurations.
Summary of selected products:
- Watts LF007 Series 2″ Lead-Free Copper Silicon Alloy Double Check Valve Backflow Preventer Assembly
- Zurn 2-950XL Backflow Preventer
- Watts LF007 Series 2″ Lead-Free Bronze Double Check Valve Backflow Preventer Assembly
- Febco LF850 Series 2″ Lead-Free Copper Silicon Alloy Double Check Valve
- Zurn Wilkins 2-350XL 2″ Double Check Backflow Preventer
Watts LF007 Series Copper Silicon Alloy Double Check Valve
The Watts LF007 copper silicon alloy double check valve backflow preventer assembly is designed for continuous-pressure piping systems in cross-connections and service line entrances. It helps prevent backflow due to back-siphonage or backpressure, protecting potable water supplies. The assembly uses a lead-free copper silicon body for durability and compliance with standards. It includes NPT connections, quarter-turn ball valve shutoffs, top-mounted test cocks, and two inline positive seating check modules with captured springs. A freeze sensor compatible with SentryPlus alerts staff when temperatures approach freezing, with an optional monitoring kit available.
Key features support reliable protection: lead-free construction, modular design for serviceability, and freeze monitoring integration. Applications span residential, commercial, and light industrial systems where backflow risk exists but health hazards are not present. While installation requires attention to flow direction and correct alignment, the modular setup enables straightforward repairs without disrupting downstream equipment. This Watts model emphasizes long-term performance in varied climates with a dedicated freeze alert option.
Zurn 2-950XL Double Check Backflow Preventer
The Zurn 2-950XL backflow preventer is a 2″ double check assembly with a short lay length and bronze body construction. Its replaceable Noryl seats and silicone seal rings support durability and ease of maintenance. The compact footprint suits limited spaces, while the wye pattern accommodates efficient installation in piping runs. This model aligns with standard backflow prevention requirements for non-health hazard scenarios and non-potable service applications, including irrigation and industrial processes. Inline serviceability allows sectional repairs without full disassembly.
Design highlights include a durable bronze body, replaceable internal components, and a streamlined layout that reduces plumbing complexity. The 950XL combines reliable backflow protection with practical maintenance features, making it a common choice for contractors handling municipal and commercial projects. As with all backflow devices, ensure correct orientation and proper testing after installation to certify performance under site conditions.
Watts LF007 Bronze Double Check Valve
The Watts LF007 bronze double check valve backflow preventer assembly provides backflow protection in non-health hazard applications with continuous-pressure piping. It features a lead-free bronze body, NPT connections, quarter-turn shutoffs, top-mounted test cocks, and two inline independent check modules with captured springs. The inline, modular design supports straightforward maintenance and in-line repairs. A freeze sensor option integrates with monitoring systems to detect freezing conditions and alert personnel as needed.
Bronze construction offers excellent durability in corrosive environments and outdoor installations. This model is suitable for non-potable services such as irrigation or fire lines, where backflow prevention is critical but health hazard exposure is limited. Proper installation and periodic testing are essential to sustain performance over time. Consider climate, water chemistry, and system pressure when selecting the bronze variant for a given project.
Febco LF850 Copper Silicon Alloy Double Check Valve
The Febco LF850 lead-free copper silicon alloy double check valve backflow preventer assembly emphasizes robust backflow prevention in non-health hazard settings. It features NPT connections, quarter turn ball valve shutoffs, top-mounted test cocks, and two inline independent seating check modules with captured springs. A freeze sensor option via SentryPlus Alert technology helps monitor freezing risks, complemented by an optional freeze sensor connection kit for temperature-based alerts.
Febco’s design focuses on a compact diameter and modular construction to ease installation and service. It is suitable for continuous-pressure piping systems where cross-connections could allow backflow, including irrigation lines and non-potable service entrances. As with all backflow devices, ensure accurate orientation, proper testing, and regular maintenance to maintain compliance with local codes and standards.
Zurn Wilkins 2-350XL Double Check Backflow Preventer
The Zurn Wilkins 2-350XL is a 2″ double check backflow preventer designed for easy installation and service. It features top-mounted test cocks, an EZSwap pressure vessel for reduced repair time and costs, and a flush tool for efficient line flushing. The assembly is intended for non-health hazard applications and continuous-pressure piping, providing reliable protection in irrigation, industrial, or municipal contexts. The flush tool capability and accessible test cocks simplify field maintenance and testing procedures.
Design benefits include quick maintenance access, a streamlined exchange process, and a compact form factor that fits tighter spaces. Ensure correct orientation during installation and perform routine testing to meet regulatory requirements. The 350XL variant is well-suited for projects needing dependable backflow protection with straightforward upkeep and documented performance in standard piping configurations.
Buying Guide
- Material choice: Copper silicon alloys offer corrosion resistance and lead-free compliance, while bronze provides durability in outdoor or aggressive water conditions. Consider your water chemistry and local code requirements when selecting materials.
- Limitations and scope: These devices are intended for non-health hazard applications in continuous-pressure piping systems. They protect potable supplies from backflow due to back-siphonage or backpressure, but are not designed for health hazard scenarios.
- Connection and installation: Verify NPT or other connection types and ensure compatibility with existing piping. Proper orientation and support reduce stress on joints and improve valve longevity.
- Maintenance and serviceability: Look for inline serviceability, replaceable seats or discs, and top-entry test cocks that simplify testing and maintenance without complete disassembly.
- Test and certification: After installation, perform field testing as required by local codes and authority having jurisdiction. Regular testing ensures ongoing protection and compliance.
- Freeze protection: Some models include freeze sensors or optional monitoring kits. If your environment experiences freezing conditions, a sensor-enabled model helps alert staff before damage occurs.
- Space and layout: Short lay lengths and modular designs save space and simplify retrofits in confined mechanical rooms or outdoor installations.