Manual

For Residential and Commercial Applications
ES-25AUB
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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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 25AUB-Z3
Water Pressure Reducing Valves*
Sizes:
1
⁄2" – 2" (15 – 50mm)
Series 25AUB-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 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
•Bronzebodyconstruction
•Serviceableinline
•Bypassfeaturecontrolsthermalexpansionpressure**
•Hightemperatureresistantreinforceddiaphragmforhotwater
Models
25AUB-Z3 NPT threaded female union inlet x NPT female outlet
25AUB-S-Z3 Solder union inlet x NPT female outlet
25AUB-DU-Z3 Double Union – NPT threaded union female inlet and
outlet
25AUB-S-DU-Z3 Double Union – Solder union inlet and outlet
25AUB-DU-THDxPEX-Z3 DoubleUnion–NPTthreadedfemaleinlet
 andPEXunionoutlet
25AUB-DU-LF-Z3 Double union body less fittings (
3
⁄4", 1", 1
1
⁄4")
25AUB-QC-Z3 Single Union – Quick-Connect union inlet (
1
⁄2",
3
⁄4", 1")
25AUB-DU-QC-Z3 Double Union – Quick-Connect inlet and outlet
(
1
⁄2",
3
⁄4", 1")
Specifications
Standard Specifications: A Water Pressure Reducing Valve with intergral
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valveshallfeatureabronze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 25AUB-Z3.
*
* 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.
25AUB-Z3