Manual

For Residential and Commercial Applications
ES-LFU5B
Series LFU5B
Water Pressure Reducing Valves**
Sizes:
1
⁄2" – 2" (15 – 50mm)
Series LFU5B Water Pressure Reducing Valves are designed to reduce
incoming water pressure to a sensible level to protect plumbing system
components and reduce water consumption. The LFU5B features Lead Free*
construction to comply with Lead Free* installation requirements. This series
is suitable for water supply pressures up to 300psi (20.7 bar) and may be
adjusted from 25 – 75psi (172 – 517 kPa). The standard setting is 50psi
(345 kPa). All parts are quickly and easily serviceable without removing
the valve from the line. The LFU5B’s standard bypass feature permits the
flow of water back through the valve into the main when pressures, due to
thermal expansion on the outlet side of the valve, exceed the pressure in the
main supply.
Features
• Standard construction includes Z3 sealed spring cage and stainless steel
corrosion resistant adjusting cage screws for accessible outdoor
or
pit installations
• Integral stainless steel strainer
• Replaceable seat module
• Lead Free* cast copper silicon alloy body construction
• Serviceable in line
• Bypass feature controls thermal expansion pressure (LFU5B-Z3)***
• High temperature resistant reinforced diaphragm for hot water
Models
LFU5B-Z3 NPT threaded female union inlet x NPT female outlet w/built in
thermal expansion bypass
LFU5B-S-Z3 Solder union inlet x NPT female outlet w/built in thermal
expansion bypass
LF5M3-Z6 Water meter threaded connections and 7
1
⁄2" (190mm) lay
length for new or existing meter box installations. For
5
⁄8"
(16mm),
5
⁄8" x
3
⁄4" (16 x 20mm) or
3
⁄4" (20mm) meter
setters or resetters
LFU5B-QC-Z3 Quick-Connect Single-Union – Inlet end
Specifications
Standard Specifications: A Water Pressure Reducing Valve with integral
strainer shall be installed in the water service pipe near its entrance to the
building where supply main pressure exceeds 60psi (413 kPa) to reduce
it to 50psi (345 kPa) or lower. The water pressure reducing valve shall be
constructed using Lead Free* materials. Lead Free* regulators shall comply
with state codes and standards, where applicable, requiring reduced lead
content. The valve shall feature a Lead Free* cast copper silicon alloy body
suitable for water supply pressures up to 300psi (20.7 bar). Provision shall
be made to permit the bypass flow of water back through the valve into the
main when pressures, due to thermal expansion on the outlet side of the
valve, exceed the pressure in the main supply. Water Pressure Reducing
Valve with built-in bypass check valves will be acceptable. Approved valve
shall be listed to ASSE 1003 and IAPMO and certified to CSA B356. Valve
shall be a Watts Series LFU5B-Z3.
LFU5B-Z3
Sensitive spring and large diaphragm
area provide for accurate pressure
control and wide range of adjustment.
High temperature resisting dia-
phragm for hot or cold water.
Lead Free* copper
silicon alloy body
construction
Stainless steel seat
Large integral
stainless steel
strainer screen
easily removed
for cleaning.
Disc holder removable
for replacement of disc
without dismantling
the valve - no special
tools required.
Suffix B Bypass feature
Spring (not shown)
“LP” Model only
Expanded
Pressure
Initial
Pressure
Reduced
Pressure
Inlet Seat and Disc
Suffix B
Thermal Expansion Bypass Check Valve Feature
LEAD FREE
*
* The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
** A water saving test program concluded that reducing the supply
pressure from 80-50psi (551-345 kPa) resulted in a water savings of
30%.
*** The bypass feature will not prevent the pressure relief valve from
opening on the hot water supply system with pressure above 150psi
(10.3 bar).
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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