Watts 757N - Manual

757OSY
(Vertical)
For Non-Health Hazard Applications
ES-757/757N
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
Series 757, 757N
Double Check Valve Assemblies
Sizes: 2 1 ⁄
2
" – 10" (65 to 250mm)
Series 757, 757N Double Check Valve Assemblies are used to
prevent backflow of non-health hazard pollutants that are objec-
tionable but not toxic, from entering the potable water supply
system. Series 757, 757N may be installed under continuous
pressure service and may be subjected to backpressure and
backsiphonage. Series 757, 757N consists of two independently
operating check valves, two shutoff valves, and four test cocks.
Features
• Extremely compact design
• 70% Lighter than traditional designs
• 304 (Schedule 40) Stainless steel housing & sleeve
• Groove fittings allow integral pipeline adjustment
• Patented tri-link check provides lowest pressure loss
• Unmatched ease of serviceability
• Available with grooved butterfly valve shutoffs
• Available for horizontal, vertical or N pattern installations
• Replaceable check disc rubber
• Sizes 2
1 ⁄
2
", 3" and 4" (65, 80 and 100mm) available with
quarter-turn ball valve shutoffs
Specifications
The Double Check Valve Assembly shall consist of two inde-
pendent tri-link check modules within a single housing, sleeve
access port, four test cocks and two drip tight shut-off valves.
Tri-link checks shall be removable and serviceable, without
the use of special tools. The housing shall be constructed of
304 Schedule 40 stainless steel pipe with groove end connec-
tions. Tri-link checks shall have reversible elastomer discs and
in operation shall produce drip tight closure against reverse flow
caused by backpressure or backsiphonage. Assembly shall be a
Watts Regulator Company Series 757, 757N.
757OSY
757NBFG
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.
* The wetted surface of this product contacted by consumable water
contains less than one quarter of one percent (0.25%) of lead by weight.
LEAD FREE
*