Watts LF957ZRPDA - Manual

For Health Hazard Applications
ES-LF957RPDA
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
Series LF957RPDA,
LF957NRPDA,
LF957ZRPDA
Reduced Pressure Detector
Assemblies
Sizes: 2 1 ⁄
2
" – 10"
Series LF957RPDA, LF957NRPDA, LF957ZRPDA Reduced
Pressure Detector Assemblies provide protection to the potable
water system from contamination in accordance with national
plumbing codes. The LF957RPDA, LF957NRPDA, LF957ZR-
PDA are normally used in health hazard applications to protect
against backsiphonage and backpressure. The Watts LF957R-
PDA, LF957NRPDA, LF957ZRPDA are used to monitor unau-
thorized use of water from the fire protection system. They feature
Lead Free* construction to comply with Lead Free* installation
requirements.
Features
• Lead Free* construction
• Extremely compact design
• 70% lighter than traditional designs
• 304 (Schedule 40) stainless steel housing & sleeve
• Groove fittings allow integral pipeline adjustment
• Patented torsion spring check provides lowest pressure loss
• Unmatched ease of serviceability
• Replaceable check disc rubber
• Available with grooved butterfly valve shutoffs
• Bottom mounted cast stainless steel relief valve
• Metered bypass to detect leakage or theft of water from the
fire sprinkler system
LF957RPDA-OSY
Specifications
The Lead Free* Reduced Pressure Detector Assembly shall
consist of two independent 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 within a
sleeve accessible single housing constructed from 304 (Sch 40)
stainless steel pipe with groove end connections. Torsion spring
checks shall have reversible elastomer discs and in operation
produce drip tight closure against reverse flow caused by back-
pressure or backsiphonage. The Lead Free* Reduced Pressure
Detector Assemblies shall comply with state codes and stan-
dards, where applicable, requiring reduced lead content. The
bypass assembly consists of a meter registering either gallon or
cubic measurements, a double check assembly and required
test cocks. Assembly shall be Watts Series LF957RPDA, LF-
957NRPDA, LF957ZRPDA.
LEAD FREE
*
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.