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Watts Series 709 - User Manual

Watts Series 709
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Series
709/709DCDA
Double Check Valve Assemblies
Double Check Detector
Assemblies
Sizes:
3
⁄4" – 10" (20-250mm)
RP/IS-709/709DCDA
Watts 8" (200mm) 709 OS&Y shown
• Installation • Service
• Repair Kits • Maintenance
For field testing procedure, send for IS-TK-DP/DL,
IS-TK-9A, IS-TK-99E AND IS-TK-99D.
For other repair kits and service parts, send for
PL-RP-BPD.
For technical assistance, contact your local Watts repre-
sentative on back page.
IMPORTANT: Inquire with governing authorities for local
installation requirements.
NOTE: For Australia and New Zealand, line strainers
should be installed between the upstream shutoff valve
and the inlet of the backflow preventer.
Its important that this device be tested periodically in
compliance with local codes, but at least once per
year or more as service conditions warrant. If
installed on a fire sprinkler system, all mechanical
checks, such as alarm checks and backflow preven-
ters, should be flow tested and inspected internally
in accordance with NFPA 13 and NFPA 25.
RP-IS-709_709DCDA.indd 1 9/26/08 2:28:13 PM

Table of Contents

Questions and Answers

  • E
    Erin HughesJul 27, 2025
    What to do if low flows pass through the Watts 709 Control Unit mainline valve (709DCDA only)?
    • E
      Elizabeth WalshJul 27, 2025
      If you're experiencing low flows through the mainline valve, here's what you can check: * The mainline check might be fouled: disassemble and clean it. * The meter strainer could be plugged: disassemble and clean it. * The mainline seat disc or seat might be damaged: disassemble and replace them. * The mainline spring might be broken: disassemble and replace it.
  • T
    tylerfaulknerAug 6, 2025
    How to fix chatter during flow conditions in a Watts 709 Control Unit?
    • S
      Shelley RichardsonAug 6, 2025
      If you notice chatter during flow conditions, it might be due to a worn, damaged, or defective guide. To resolve this, disassemble the unit and repair or replace the guide.
  • M
    Michael WalkerAug 16, 2025
    What to do if the Watts 709 check valve fails to hold 1.0 PSID minimum?
    • O
      osmithAug 16, 2025
      If the check valve isn't holding the minimum pressure, here are some potential causes and solutions: 1. Debris on the check disc sealing surface: Disassemble and clean. 2. Leaking gate valve: Disassemble and clean or repair. 3. Damaged seat disc or seat o-ring: Disassemble and replace. 4. Damaged guide holding check open: Disassemble and clean or replace. 5. Weak or broken spring: Disassemble and replace the spring.

Summary

Basic Installation Instructions

Indoor Installations

Outdoor Installations

Parallel Installations

Test Procedure for Double Check Valve Assemblies

Test No. 1 - Test No. 1 Check Valve

Procedure for testing the first check valve, involving hose connections and pressure differential readings.

Test No. 2 - Test No. 2 Check Valve

Procedure for testing the second check valve, similar to Test No. 1 but with different test cock connections.

Service, Replacement Parts and Maintenance (3;4 - 2)

Check Valve Module Servicing

Replacement Parts Identification

Service, Replacement Parts and Maintenance (21;2 - 10)

Check Valve Assembly Servicing

Replacement Parts for Larger Sizes

Troubleshooting Guide

Check Valve Failure to Hold Pressure

Identifies causes like debris, leaking valves, or damaged components leading to failure to hold 1.0 PSID.

Chatter During Flow Conditions

Diagnoses chatter issues in flow conditions, attributing them to worn or defective internal components.

Low Flows Through Mainline Valve

Addresses low flow issues in the mainline valve, caused by fouling, plugged strainers, or broken springs.

Watts Series 709 Specifications

General IconGeneral
Series709
Model709
ManufacturerWatts
Connection Size1/2" to 2"
Temperature Range33°F-140°F

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