Watts 709 User Manual

709 OSY

ES-709L

Ball Valve Test Cock

Check Assembly

Module

Bolted Cover

Replaceable

Resilient

Disc

Replaceable Seat

Lower Stem

Guide

Job Name ______________________________________________ Contractor ______________________________________________

Job Location ____________________________________________ Approval ______________________________________________

Engineer________________________________________________ Contractor’s P.O. No. ______________________________________

Approval________________________________________________ Representative __________________________________________

For Non-Health Hazard Applications

Now Available

WattsBox Insulated Enclosures.

For more information, send for literature ES-WB.

IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES

FOR LOCAL INSTALLATION REQUIREMENTS

Series 709

Double Check Valve Assemblies

Sizes: 21⁄2" – 10" (65 – 250mm)

Series 709 Double Check Valve Assemblies are designed to
prevent the reverse flow of polluted water from entering into
the potable water system. This series can be applied, where
approved by the local authority having jurisdiction, on non­health hazard installations. Series 709 features a modular
check design concept to facilitate easy maintenance. Check
with local jurisdictional authority as to installation require­ments.

Features

• Replaceable bronze seats

• Maximum flow at low pressure drop

• Design simplicity for easy maintenance

• No special tools required for servicing

• Captured spring assemblies for safety

• Approved for vertical flow up installation

Models

Suffix:
NRS – non-rising stem resilient seated gate valves
OSY – UL/FM outside stem and yoke resilient seated gate

valves
S-FDA – FDA epoxy coated strainer
BB – bronze body - 2

1

⁄2" – 3" (64 – 76mm)
QT – quarter-turn ball valves
QT-FDA – FDA epoxy coated ball valve shutoffs
LF – without shutoff valves

Specifications

A Double Check Valve Assembly shall be installed at referenced
cross-connections to prevent the backflow of polluted water
into the potable water supply. The cross-connections shall be
determined by local inspection authority for use where a high
hazard situation does not exist. Valve shall feature modular
check assemblies with center stem guiding. Each check
module shall have a captured spring and be accessible
through a bolted cover plate. Seats shall be replaceable with­out special tools. It shall be a complete assembly including
tight-closing resilient seated shutoff valves, test cocks, and a
strainer is recommended. The assembly shall meet the
requirements of ASSE No. 1015; AWWA C510-92; CSA
B64.5 and UL Classified File No. EX3185. Approved by the
Foundation for Cross-Connection Control and Hydraulic
Research at the University of Southern California. Assembly
shall be a Watts Regulator Company Series 709.

Check Assembly Module

Series 709 features a modular design concept which facili­tates complete maintenance and assembly by retaining the
spring load. Also, the first and second check module are
identical and can be interchanged.

Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with­out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

Approvals

Approved by the Foundation for Cross-Connection Control
and Hydraulic Research at the University of Southern
California. Sizes 4" – 10" (100 – 250mm) approved hori­zontal and vertical “flow up”. Size 2

1

⁄2" and 3" (65 – 80mm)

approved horizontal only.
Factory Mutual approved 4" – 10" (80 – 250mm) vertical

“flow up” with OSY gate valves only.

Note: Model "S" not listed

Dimensions — Weights

D

C (open)

Ñ

L

A

N1

Materials

Check Valve Bodies: Epoxy coated cast iron
Seats: Bronze

Pressure — Temperature

Temperatures Range: 33°F – 110°F (0.5°C – 43°C) continuous,

140°F (60°C) intermittent

Maximum Working Pressure: 175psi (12.1 bar)

Standards

AWWA C510-92
IAPMO PA 31
USC Manual for Cross-Connection Control, 8th Edition

SIZE (DN) DIMENSIONS

A C (OSY) C (NRS) D L U* M N

in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm

21⁄2 65 393⁄8 1000 163⁄8 416 93⁄8 238 31⁄2 89 241⁄8 613 11 279 10 254 61⁄2 165

38040

3

⁄8 1025 187⁄8 479 101⁄4 260 33⁄4 95 241⁄8 613 14 356 101⁄8 257 7 178
4 100 523⁄8 1330 223⁄4 578 123⁄16 310 41⁄2 114 341⁄8 867 14 356 121⁄8 308 81⁄4 210
6 150 627⁄8 1597 301⁄8 765 16 406 51⁄2 140 415⁄8 1057 16 406 181⁄2 470 131⁄2 343
8 200 75 1905 373⁄4 959 1915⁄16 506 61⁄2 165 52 1321 21 533 215⁄8 549 151⁄2 394

10 250 90 2286 453⁄4 1162 2313⁄16 605 8 203 64 1626 25 635 26 660 181⁄2 470

SIZE (DN) DIMENSIONS WEIGHT STRAINER

N1† R R T NRS OSY QT Weight

in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs. lbs. kgs. lbs. kgs.

21⁄2 65 10 254 4 102 16 406 3 76 167 76 170 77 154 70 28 13

3 80 10 254 5 127 16 406 3 76 167 76 170 77 162 73 34 15
4 100 12 305 6 152 193⁄4 502 6 152 368 167 383 174 275 125 60 27
6 150 20 508 11 279 26 660 71⁄2 191 627 284 707 321 611 277 122 55
8 200 223⁄4 578 111⁄4 286 111⁄4 286 9 229 1201 545 1307 593 1419 644 247 112

10 250 28 711 121⁄2 318 121⁄2 318 101⁄4 260 2003 909 2073 940 2466 1119 370 168
† - Dimension required for screen removal. Quarter-turn (QT) valve dimensions.
*Service clearance for check assembly from center.

M

R

T

2

U

1015

B64.5