Watts 957Z - Manual

For Health Hazard Applications
ES-957/957N/957Z
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
Series 957, 957N, 957Z
Reduced Pressure Zone Assemblies
Sizes: 2 1 ⁄
2
" – 10" (65 – 250 mm)
Series 957, 957N, 957Z Reduced Pressure Zone Assemblies provide
protection to the potable water system from contamination in ac-
cordance with national plumbing codes. Series 957, 957N, 957Z are
normally used in health hazard applications for protection against
backsiphonage or backpressure.
Features
• 2 1 ⁄
2
", 3" and 4" (65, 80 and 100mm) sizes available with quarter-turn
ball valve shutoffs
• Replaceable check disc rubber
• Extremely compact design
• 70% Lighter than traditional designs
• 304 (Schedule 40) stainless steel housing & sleeve
• Groove fittings allow integral pipeline adjustment
• Patented torsion spring checks provide lowest pressure loss
• Unmatched ease of serviceability
• Bottom mounted cast stainless steel relief valve
• Available with grooved butterfly valve shutoffs
Specifications
The Reduced Pressure Zone Assembly shall consist of two indepen-
dent torsion spring check modules, a differential pressure relief valve
located between and below the two modules, two drip tight shutoff
valves, and required torsion spring check modules and relief valve
shall be contained with a sleeve accessible single housing con-
structed from 304 (Schedule 40) stainless steel pipe with groove end
connections. Torsion spring checks shall have replaceable elastomer
discs and in operation produce drip tight closure against the reverse
flow of liquid caused by backpressure or backsiphonage. Assembly
shall be a Watts Regulator Company Series 957, 957N, 957Z.
957OSY
957ZBFG
957QT
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 0.25% of lead by weight.
LEAD FREE
*