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Series
709/709DCDA
Double Check Valve Assemblies
Double Check Detector
Assemblies
3
Sizes:
⁄
" – 10" (20-250mm)
4
• 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.
Watts 8" (200mm) 709 OS&Y shown
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
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Related Manuals for Watts Series 709
Summary of Contents for Watts Series 709
- Page 1 IS-TK-9A, IS-TK-99E AND IS-TK-99D. Double Check Detector For other repair kits and service parts, send for Assemblies PL-RP-BPD. For technical assistance, contact your local Watts repre- Sizes: ⁄ " – 10" (20-250mm) sentative on back page. Watts 8" (200mm) 709 OS&Y shown IMPORTANT: Inquire with governing authorities for local installation requirements.
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Page 2: Basic Installation Instructions
It is important that Series 709 be tested periodically in compliance with local codes, but at least once a year or more often, depending upon system conditions. - Page 3 United States for verifi cation of the functioning of TK-DP Backfl ow preventers. Test Kit The following procedure is not a specifi c recommendation. The Watts series of test kits are capable of performing any of the recognized Backfl ow test procedures. A. Flush all test cocks B.
- Page 4 Service, Replacement Parts and Maintenance " – 2" (20-50mm) 1. After removing the cover screw, the check comes out with the cover. 2. Holding the check Valve module in both hands, rotate the assembly ⁄ turn. This will disengage the disc and spring assembly into individual components.
- Page 5 Service, Replacement Parts and Maintenance 2 " – 10" (65-250mm) CAUTION: The check valve disc and spring assembly are in 1. Remove hatch cover bolts. NOTE: The 709 is designed so that, compression. The spring load is captured by the two spring retainers when the bolts are backed off ⁄...
- Page 6 For Basic Types of Backflow Preventers Examples of Type & Purpose Description Installed At Installations Two independent check Main supply lines All cross-connections subject to REDUCED PRESSURE ZONE Commercial boilers valves with intermediate backpressure or back siphonage BACKFLOW PREVENTER Hospital equipment relief valve.
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Page 7: Troubleshooting Guide
Troubleshooting Guide Symptom Cause Solution 1. Check valve fails to hold a. Debris on check disc Disassemble and clean 1.0 PSID minimum sealing surface b. Leaking gate valve Disassemble and clean or repair c. Damaged seat disc or Disassemble and replace seat o-ring d. - Page 8 For additional information, visit our web site at: www.watts.com Limited Warranty: Watts Regulator Co. (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.