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Watts Series 709 Installation Instructions Manual

Summary of Series 709

  • Page 1

    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-99...

  • Page 2: Indoor Installations

    2 watts series 709 double check valve may be installed in either a vertical or hori- zontal position. Install valve in the line with arrow on valve body pointing in the direction of fl ow. They should always be installed in an accessible location to facilitate testing and servicing. Pipe lines shoul...

  • Page 3: Parallel Installations

    3 parallel installations two or more series 709 devices may be piped in parallel (where approved) to serve a large supply pipe main. This type of installation is employed whenever it is vital to maintain a continuous supply of water where inter- ruptions for testing and servicing would be unacceptab...

  • Page 4: 709

    4 709 3 / 4 " – 2" edp no. Kit no. Size first or second check kits in. Mm 0887150 rk 709 ck4 3 ⁄ 4 – 1 20-25 0887151 rk 709 ck4 1 1 ⁄ 2 – 2 32-50 0887154 rk 709 ck4ss* 3 ⁄ 4 – 1 20-25 0887155 rk 709 ck4ss* 1 1 ⁄ 2 – 2 32-50 kit includes: disc assembly, spring, seat, seat o-ring and cover o-ring. Com...

  • Page 5: 709 2

    5 1. Remove hatch cover bolts. Note: the 709 is designed so that, when the bolts are backed off 1 ⁄ 2 ", all the spring load is released f r o m t h e c o v e r a n d r e t a i n e d b y t h e c h e c k m o d u l e . Caution: be sure to verify this before removing all the bolts. 2. Lift check valve ...

  • Page 6

    6 type & purpose reduced pressure zone backflow preventer for high hazard cross-connections and continuous pressure application. Reduced pressure detector assembly high hazard double check valve assembly for low hazard cross-connections and continuous pressure applications. Double check detector ass...

  • Page 7: Troubleshooting Guide

    7 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. Damaged guide holding disassemble clean or replace...

  • Page 8

    For additional information, visit our web site at: www.Watts.Com rp-is-709_709dcda 0829 edp# 0835235 © watts, 2008 usa: 815 chestnut st., no. Andover, ma 01845-6098; www.Watts.Com canada: 5435 north service rd., burlington, ont. L7l 5h7; www.Wattscanada.Ca b a c k f l o w p r e v e n t i o n p r o d...