9D
Dual Check Valve Backflow Preventers with Intermediate Atmospheric Vent
Series 9D Dual Check Valves with Intermediate Atmospheric Vent prevent the reverse flow of hot or cold polluted water from entering into the potable water supply. They have a brass body with stainless steel internal parts, integral strainer, and two durable, tight-sealing, rubber check valves. Series 9D is designed for continuous pressure, non-health hazard applications in smaller supply lines, such as laboratory equipment, processing tanks, sterilizers, dairy equipment, and specifically for boiler feed lines. Minimum Working Pressure: 25psi (172kPa), Maximum Working Pressure: 175psi (12.1 bar)
Features
- Primary check valve has rubber disc seating against a mating rubber part to ensure tight closing
- Line-sized construction enables check modules to open further, helping to reduce check fouling
- Stainless steel internal parts for longevity
- Can be installed vertically or horizontally
Literature
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- 9D, LF9D, 8, NF8, SD-3, 9BD, 7, LF7, N9, LFN9, NLF9, N9-CD, 912HP, SD-2 - Repair Kits Parts Breakdown
- Brochure - Backflow Prevention and Flow Control Plumbing
- Installation Instructions - 9DM2, 9DM3, LF9D
- Product Flyer - Watts Valves with Press Connections
- Specification Sheet - 9D
- Specification Sheet - 9D (French)
- Specification Sheet - 9D (Spanish)
Approval/Certification Information
For product-specific approval information, please refer to the product’s specification sheet (see literature section above) or ask a Watts representative. For general information regarding any approval certification partners identified in the specification sheet, please visit our certification partners’ websites:
| ASSE | CSA | FM Approvals | NSF |
| UL | ULC | USC | WQA |