Owner's manual

For Residential and Commercial Applications
ES-LF25AUB
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LF25AUB-Z3
EPDM
diaphragm
Integral
stainless
steel strainer
Union inlet
connection
Replaceable
seat module
Bypass valve
assembly for 1
1
⁄4" – 2"
(32 – 50mm) sizes
Bypass for
1
⁄2" – 1"
(15 – 25mm)
sizes
Series LF25AUB-Z3
Water Pressure Reducing Valves**
Sizes:
1
⁄2" – 2" (15 – 50mm)
Series LF25AUB-Z3 Water Pressure Reducing Valves are designed to reduce
incoming water pressure to a sensible level to protect plumbing system
components and reduce water consumption. 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 LF25AUB-Z3 features Lead Free* construction to comply
with Lead Free* installation requirements. The standard setting is 50psi (345
kPa). All parts are quickly and easily serviceable without removing the valve
from the line. The 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
• Union inlet connection
• Integral stainless steel strainer
• Replaceable seat module
• Lead Free* cast copper silicon alloy construction
• Serviceable in line
• Bypass feature controls thermal expansion pressure***
• High temperature resistant reinforced diaphragm for hot water
Models
LF25AUB-Z3 NPT threaded female union inlet x NPT female outlet
LF25AUB-S-Z3 Solder union inlet x NPT female outlet
LF25AUB-DU-Z3 Double Union – NPT threaded union female inlet and outlet
LF25AUB-S-DU-Z3 Double Union – Solder union inlet and outlet
LF25AUB-DU-THDxPEX-Z3 Double Union – NPT threaded female inlet
and PEX union outlet
LF25AUB-DU-LF-Z3 Double union body less fittings (
3
/4", 1", 1
1
/4")
LF25AUB-QC-Z3 Single Union – Quick-Connect union inlet (
1
/2",
3
/4", 1")
LF25AUB-DU-QC-Z3 Double Union – Quick-Connect inlet and outlet
(
1
/2",
3
/4", 1")
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 reduc-
ing 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 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 LF25AUB-Z3.
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.