The Watts 9D-BS 3/4 is a 3/4" dual check valve with NPT connections, approved for low health hazard protection. It features a rubber seat. Rated to 175 psi and 33°F to 250°F.
This 1/2 inch bronze combination fill valve and backflow preventer is for use in commercial and residential hydronic heating systems to provide make-up water to the boiler, and prevent backflow when supply pressure falls below system pressure. It consists of a bronze model 9D backflow preventer and a bronze feed model BD1156F water pressure regulator in one pre-assembled unit. The high capacity fill valve provides quick system filling and purging. It is designed for use in the boiler feed lines of hydronic heating systems. It has BSP threaded connections. The maximum pressure is 100 psi (6.9 bar).
Features
- Use in commercial and residential hydronic heating systems
- Maximum pressure is 100 psi
- High capacity fill valve provides quick system filling and purging
- Designed for use in the boiler feed lines of hydronic heating systems
Common Questions
- What hazard level is this Dual Check approved for?
- It is rated for low health hazard (non-toxic, "pollutant") cross-connections only. Where the substance downstream could be a health hazard, codes require a reduced pressure zone (RPZ) assembly instead. The assembly is listed to ASSE 1012.
- Can this be installed on potable water?
- No. This model is not certified lead-free, so it may not be installed in potable water systems in states enforcing the NSF/ANSI 372 weighted-average lead rule. Use it on non-potable service — fire lines, irrigation or industrial water — or order the LF (lead-free) version of this model for drinking-water use.
- Can this device be field tested?
- No. It has no test cocks and is not a testable assembly, so it cannot be certified by a backflow tester. Where a jurisdiction requires an annually tested device, specify a testable assembly (double check, RPZ, or PVB) instead.
Specifications
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Type: Dual Check
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Size: 3/4"
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Inlet Size: 3/4"
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Outlet Size: 3/4"
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Connection: NPT
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Seat / Seal Material: Rubber
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Max Pressure (psi): 175
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Backflow Protection: Backpressure
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Operation: Continuous
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Pack Quantity: 12
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: 9D-BS 3/4
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Temperature: 33°F to 250°F
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Certifications: ASSE-1012, CSA-B64
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Lead-Free: No
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Assembly Type: Dual Check
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Hazard Protection Level: Low Health Hazard
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ASSE Standard: ASSE 1012
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USC FCCCHR Approved: No
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Field Testable: No
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Number of Test Cocks: 0
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Shutoff Valves: None
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Flood Sensor (SentryPlus Alert): No
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Strainer Included: No
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Air Gap Fitting Included: No
