Series 709 Double Check Valve Backflow Preventer
FEATURES
AVAILABLE MODELS
Suffix:
NRS - with non-rising stem resilient seated gate valves
OS&Y - with UL/FM resilient seated outside stem and yoke
S-FDA - with FDA approved epoxy coated strainer
BB - with bronze body - 2 1 Ú2", 3" (64-76mm)
QT - with quarter-turn, full port, resilient seated ball
QT-FDA - with FDA approved epoxy coated ball valve shutoffs
LF - without shutoffs
SPECIFICATIONS
FOR DOUBLE CHECK VALVE BACKFLOW PREVENTERS
A double check valve backflow preventer 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 fea-ture 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 assem-bly including tight-closing resilient seated shutoff valves, test cocks, and a strainer is recommended. The assembly shall meet the requirements of ASSE
Watts Regulator Company, 815 Chestnut St., N. Andover, MA 01845. Tel: 978-688-1811; Fax: 978-689-6247.