Best 2″ Double Check Valve Options for Reliable Backflow Prevention
When selecting a 2″ double check valve, choose products designed to prevent backflow in continuous-pressure piping systems, cross-connections, and service line entrances. This collection targets buyers seeking dependable backflow prevention for non-health-hazard applications, with options suitable for commercial or residential installations. The top picks below emphasize lead-free construction, quick shutoffs, and diagnostic features like freeze sensors. Ideal buyers include facility managers, plumbers, and property owners who need reliable, low-maintenance backflow protection.
Summary of selected products
| Product | Best For | Key Benefit |
|---|---|---|
| Watts LF007 Series | Facilities needing lead-free, modular backflow prevents | Freeze sensor and top-entry design |
| Febco LF850 Series | Durable, high-visibility monitoring for freezing risks | Modular with two check modules |
| Zurn 2-950XL | Compact 2″ backflow with replaceable seats | Short lay length, bronze body |
| Zurn Wilkins 2-350XL | Easy installation and maintenance | EZSwap vessel, top test cocks |
| Valterra 200-20W PVC Swing | Budget-friendly PVC option for non-potable lines | High pressure tolerance and corrosion resistance |
Watts LF007 Series 2″ Lead-Free Double Check Valve
The Watts LF007 Lead-Free Copper Silicon Alloy Double Check Valve Backflow Preventer Assembly provides a two-check module setup with independent seating and captured springs. It features NPT connections, quarter-turn shutoffs, and a top-mounted test cock arrangement. This model is best for buyers prioritizing lead-free construction and modular design for easy maintenance. A freeze sensor compatible with SentryPlus Alert is included, with an optional connection kit for temperature monitoring. Suitable for non-health hazard applications in continuous-pressure piping systems.
- Best for facilities needing lead-free, compliant backflow prevention.
- Better for installations requiring a freeze-sensing monitoring option.
Caution: Ensure compatibility with existing SentryPlus monitoring or plan for an install kit to enable freezing-temperature alerts.
Febco LF850 Series 2″ Lead-Free Double Check Valve
The Febco LF850 Series mirrors Watts’ lead-free copper-silicon construction with dual check modules and top-mounted test cocks. Designed for non-health hazard applications, it emphasizes reliability in continuous-pressure piping and cross-connections. The freeze sensor option is compatible with SentryPlus Alert technology, aiding facility personnel during freezing conditions. A modular design supports straightforward maintenance and potential upgrades.
- Best for facilities prioritizing a robust, modular backflow assembly with freeze monitoring.
- Better for systems where quick access to test cocks and replacement of components is desired.
Caution: Confirm availability of the optional freeze sensor kit if temperature protection is a priority.
Zurn 2-950XL Backflow Preventer
The Zurn 2-950XL features a 2″ double check assembly with a short lay length and bronze body construction. Its replaceable Noryl seats and silicone seal rings support easier maintenance and a compact footprint. Best for buyers seeking a space-saving design without sacrificing performance. It is suitable for non-health hazard applications and cross-connection protection in tight installations.
- Best for compact installations where space is at a premium.
- Better for ease of part replacement due to replaceable seats.
Caution: Bronze body requires proper corrosion considerations depending on water chemistry and environmental conditions.
Zurn Wilkins 2-350XL 2″ Backflow Preventer
The Zurn Wilkins 2-350XL 2″ Double Check Backflow Preventer emphasizes ease of installation and maintenance. Top-mounted test cocks allow quick access, and the EZSwap pressure vessel reduces repair time and costs. A dedicated flush tool is included to facilitate line flushing and help save installation time. This model is well-suited for projects prioritizing serviceability and quick maintenance cycles.
- Best for quick-install projects and frequent maintenance scenarios.
- Better for workflows that benefit from planned flushes and rapid vessel swaps.
Caution: Ensure compatibility with existing piping and space for the EZSwap vessel in the installation area.
Valterra 200-20W PVC Swing (2″) Check Valve
The Valterra 200-20W PVC Swing check valve combines PVC construction with an EPDM seal for reliable resistance to water and oils. It withstands up to 150 psi, making it a budget-friendly option for non-potable lines or where chemical resistance is a priority. Best for cost-conscious projects or non-potable water lines where a simple check valve suffices. Use in applications where visibility of internal components is not required.
- Best for economical installations on non-potable lines.
- Better for lighter-duty systems needing basic backflow prevention.
Caution: PVC systems can be sensitive to certain solvents and temperature ranges; verify compatibility with the fluid medium.
Buying Guide: Key Considerations For 2″ Double Check Valves
Application scope and system type
- Non-health hazard vs. health hazard: The discussed models are tailored for non-health hazard applications. Verify your project’s classification and local codes.
- Continuous-pressure systems: All chosen options are designed for continuous-pressure piping, cross-connections, and service line protection.
Materials and lead content
- Lead-free construction: Consider copper-silicon alloys or equivalent lead-free materials to comply with regulatory standards and water quality concerns.
- Body material: Bronze and copper-silicon alloys offer durability; PVC options prioritize corrosion resistance and lower cost.
Design and maintenance features
- Test cocks and accessibility: Top-mounted test cocks enable easier inspection and maintenance in tight spaces.
- Modular and serviceable: Vessels and seating modules that are replaceable reduce maintenance downtime.
- Freeze monitoring: Freeze sensors help protect against freezing conditions and may integrate with alert systems.
Installation considerations
- Space constraints: Short lay length and compact designs matter in tight installations.
- Connection types: Verify NPT vs. other connections to match existing piping.
Performance and compatibility
- Pressure ratings: Check maximum psi ratings to ensure compatibility with your system pressure.
- Material compatibility: Consider water chemistry and potential oil or chemical exposure when selecting PVC vs. bronze or copper-silicon models.
FAQ
- What is a 2″ double check valve used for?
- Do these valves require testing?
- Are lead-free options necessary?
- What maintenance is typical?
- Can I install these valves myself?
- What is the benefit of a freeze sensor?
A 2″ double check valve provides backflow protection in drinking water systems by preventing back-siphonage and backpressure in continuous-pressure piping, typically in non-health hazard applications.
Yes, most models include test cocks for inspection and testing to ensure proper operation of the check valves.
Lead-free construction is often required by code and water quality standards, especially for potable supply lines.
Maintenance usually includes testing, check-valve seating inspection, replacing worn seats, and periodic flushing as recommended by the manufacturer.
Installation should follow local codes and manufacturer instructions. Some models offer easier maintenance and vessel swaps, which can simplify DIY projects; otherwise, professional installation is advised.
A freeze sensor alerts facility personnel to freezing conditions, helping prevent damage by enabling timely mitigation actions.