1/2" Watts 9D-M3 Dual Check with Atmospheric Vent **Threaded Ends**

Item Number: 0061935
1 1
$246.00
In Stock (10)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Watts
  • Nominal Size: 1/2 inch
  • Weight: 14.8 lb
  • Body Material: Bronze
  • Internal Parts: Stainless Steel
  • Minimum Operating Pressure: 25 psi
  • Maximum Operating Pressure: 175 psi
  • Temperature Range: 33°F - 250°F
  • Inlet/Outlet Connections: 1/2 inch Female Union NPT
  • Certifications: ASSE 1012, CSA B64

Description

The 1/2" Watts 9D-M3 Dual Check Valve with Intermediate Atmospheric Vent is a robust backflow preventer designed to safeguard potable water systems from hot or cold polluted water. It is ideal for continuous pressure, non-health hazard applications in smaller supply lines, including laboratory equipment, processing tanks, sterilizers, dairy equipment, and especially boiler feed lines. Constructed with a bronze body and stainless steel internal parts, it ensures durability and reliable performance. This valve features 1/2" Female Union NPT connections and is approved by ASSE 1012 and CSA B64, offering a compact and easy-to-maintain solution.

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Connections

  • The Watts 9D-M3 valve features 1/2 inch Female Union NPT connections for both the inlet and outlet. These union connections are designed to facilitate easy removal and replacement for maintenance.
  • A 1/2 inch threaded drain connection is provided for the intermediate atmospheric vent, which should be properly piped to a suitable disposal location to prevent water damage.

Warranty Information

Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge. THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.
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Additional Details

The 1/2" Watts 9D-M3 Dual Check Valve with Intermediate Atmospheric Vent prevents the reverse flow of hot or cold polluted water from entering into the potable water supply. This valve is designed for continuous pressure, non-health hazard applications in smaller supply lines.

Construction & Design

  • Features a durable bronze body with stainless steel internal parts and an integral strainer.
  • Incorporates two tight-sealing rubber check valves to ensure reliable backflow prevention.
  • Designed with true line-sized construction, allowing check modules to open further to reduce dirt and debris fouling.
  • Offers maximum flow at low pressure drop for efficient operation.
  • Compact design with simplicity for easy maintenance.
  • Can be installed either vertically or horizontally.

Applications

  • Ideally suited for use with laboratory equipment, processing tanks, sterilizers, dairy equipment, and similar non-health hazard applications.
  • Particularly recommended for boiler feed lines to prevent backflow when supply pressure falls below system pressure.

WARNING: It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Before installing, consult your local water authority, building and plumbing codes.

Specifications

  • Product Type: Dual Check Valve with Intermediate Atmospheric Vent
  • Valve Series: Watts 9D
  • Nominal Size: 1/2 inch
  • Body Material: Bronze
  • Internal Parts Material: Stainless Steel
  • Check Valves: Durable, tight seating rubber check valve assemblies
  • Temperature Range: 33°F - 250°F (0.5°C – 121°C)
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Minimum Required Pressure: 25 psi (1.7 bar)

Connections & Dimensions

  • Inlet/Outlet Connections: 1/2 inch Female Union NPT
  • Drain Connection: 1/2 inch Threaded
  • Length (A): 4 15/16 inches (125 mm)
  • Width (B): 2 9/16 inches (65 mm)
  • Height (E): 1 15/16 inches (49 mm)
  • Vent Height (E1): 2 9/16 inches (65 mm)
  • Weight: 1 1/2 lbs (0.68 kg)

Certificates & Approvals

  • ASSE: 1012
  • CSA: B64
  • NYC: BSA 104-75-SM
  • Certified by: CSA

FAQs

What is the primary function of the Watts 9D-M3 Dual Check Valve?

The primary function of the Watts 9D-M3 Dual Check Valve is to prevent the reverse flow of hot or cold polluted water from entering into a potable water supply system.

What are the main applications for this valve?

This valve is ideally suited 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.

What are the pressure and temperature limits for this device?

The Watts 9D-M3 has a minimum required pressure of 25 psi, a maximum working pressure of 175 psi, and an operating temperature range of 33°F to 250°F.

How does this valve connect to a plumbing system?

This valve connects using 1/2 inch Female Union NPT (National Pipe Tapered) threaded connections for both the inlet and outlet, designed for easy installation and maintenance. It also has a 1/2 inch threaded drain connection.

Can the Watts 9D-M3 be installed in any orientation?

Yes, the Watts 9D-M3 Dual Check Valve can be installed either vertically or horizontally, providing flexibility for various plumbing configurations.