Watts LF709 - Manual

LF709 LF
ES-LF709L
Ball Valve Test Cock
Check Assembly
Module
Bolted Cover
Replaceable
Resilient
Disc
Replaceable Seat Lower Stem
Guide
For Non-Health Hazard Applications
Now Available
WattsBox Insulated Enclosures.
For more information, refer to literature ES-WB.
Series LF709
Double Check Valve Assemblies
Sizes: 2 1 ⁄
2
" – 10" (65 – 250mm)
Series LF709 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 non-health
hazard installations. Series LF709 features a modular check
design concept to facilitate easy maintenance. Check with local
jurisdictional authority as to installation requirements. The LF709
features Lead Free* construction to comply with Lead Free*
installation requirements.
Features
• Replaceable stainless steel 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
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 Lead
Free* Double Check Assemblies shall comply with state codes
and standards, where applicable, requiring reduced lead content.
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. As-
sembly shall be a Watts Series LF709.
Check Assembly Module
Series LF709 features a modular design concept which facili-
tates complete maintenance and assembly by retaining the
spring load. Also, the first and second check module are identi-
cal and can be interchanged.
LEAD FREE
*
* The wetted surface of this product contacted by consumable water
contains less than 0.25% of lead by weight.
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 with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
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NOTICE
Inquire with governing authorities for local installation requirements