Watts 9DM2-LU ¾″ Dual Check Valve Backflow Preventer with Atmospheric Vent (Order Code: 0063451).
Product Overview:
The Watts 9DM2-LU dual check valve with atmospheric vent offers reliable backflow protection for non-health hazard applications in residential and light commercial systems. Designed specifically for boiler feeds, lab equipment, processing tanks, and sterilizers, this compact inline valve prevents contaminated water from reversing into the potable supply. With durable brass construction, stainless steel internal components, and a built-in strainer, it’s built for performance in continuous pressure applications.
Features & Benefits:
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Brass body construction for long-term durability
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Two internal check valves with tight rubber seating for leak-free operation
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Atmospheric vent enhances protection against backsiphonage
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Built-in stainless steel strainer prevents debris damage
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Compact inline design fits easily in tight piping systems
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Threaded NPT connections for easy installation
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Non-health hazard backflow protection
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Watts quality ensures reliability in high-performance systems
Product Specifications:
| Specification | Detail |
|---|---|
| Product Type | Dual Check w/ Atmospheric Vent |
| Body Material | Brass |
| Inlet/Outlet Size | ¾" Female Threaded (FPT) |
| Maximum Pressure | 175 PSI (12.1 BAR) |
| Maximum Temperature | 250°F |
| Minimum Temperature | 33°F (0.5°C) |
| Protection Type | Backpressure & Backsiphonage |
| Lead Free | No |
| Internal Parts | Stainless Steel & Rubber |
| Strainer Included | Yes |
| Series | 9D |
| Orientation | Inline Installation |
| Application | Continuous Pressure Use |
Installation Tips:
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Install immediately downstream of water supply lines to protect potable systems
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Use in horizontal or vertical orientation depending on space and flow direction
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Flush supply line before installation to avoid debris damage to check valves
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Thread sealant or Teflon tape recommended on all threaded connections
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Do not install in locations where freezing may occur
Frequently Asked Questions
Q: What is the purpose of the atmospheric vent?
A: The atmospheric vent allows the valve to relieve pressure and discharge water in the event of check valve failure, preventing backsiphonage into the potable water supply.
Q: Can this be used for hot water lines?
A: Yes, it supports up to 250°F, making it suitable for both hot and cold water applications like boiler feeds or sterilizers.
Q: Does this meet lead-free regulations?
A: No, this version is not lead-free. For potable systems requiring lead-free compliance, select a lead-free designated model.
Q: Does it include a built-in strainer?
A: Yes, it features a stainless steel strainer to protect the internal check valves from particulate damage.
Q: What kind of systems is this designed for?
A: This valve is ideal for smaller-diameter lines found in boiler feeds, lab stations, processing tanks, and equipment with potential for backflow.
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