Specification

Series LF3L, LF53L
Poppet Type Pressure Relief
Valves for Protection Against
Excessive Pressure
Sizes: LF3L:
3
⁄4" LF53L:
1
⁄2"
Series LF3L and LF53L are used for protection against excessive
pressure on domestic storage tanks or tankless water heaters.
Similar in construction to Watts Model LF10L, the Model LF3L
has no temperature relieving element. Model LF53L has the same
basic design as Model LF3L except it is furnished in
1
⁄2" size and
does not comply with ASME requirements. Pressure range is
75-150psi (5.2-10.3 bar). Series LF3L and LF53L come in stan-
dard settings of 75, 100, 125 and 150psi (5.2, 6.9, 8.6 and 10.3
bar). These Pressure Relief Valves are popularly used in conjunc-
tion with the Model LF210 gas shutoff valve on gas water heat-
ers to shut off gas to heater if water heater temperature exceeds
210°F (99°C). The LF3L and LF53L features Lead Free* construc-
tion to comply with Lead Free* installation requirements.
Features
• Furnished with test levers
• Relieves excessive pressure on storage tanks
• Relieves excessive pressure on tankless water heaters
• Compatible with Model LF210 gas shutoff valves
Models
Model LF3L Listed and certified by the National Board of Boiler
and Pressure Vessel Inspectors to ASME section
IV & by CSA to ANSI Z21.22/CSA 4.4
Model LF53L (Does not comply with ASME requirements) Listed
and certified by CSA to ANSI Z21.22/CSA 4.4
Approvals
Materials
Body: LF3L - Lead Free* copper alloy
LF53L - Lead Free* cast copper silicon alloy
Spring: Stainless steel
Disc: Silicone
LF53L
For Residential, Commercial and Industrial Applications
ES-LF3L-LF53L
Job Name
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Approval
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Engineer
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LEAD FREE
*
LF3L
Pressure
Pressure range: 75-150psi (5.2-10.3 bar)
Standard settings: 75, 100, 125 and 150psi
(5.2, 6.9, 8.6 and 10.3 bar)
NOTICE
Maximum system operating pressure must not exceed 75% of valve
set pressure.
Dimensions – Weights
MODEL SIZE HEIGHT WIDTH WEIGHT
in in mm in mm lbs. gms
LF3L
3
⁄4 3
11
⁄64 80 1
5
⁄32 40
13
⁄32 181
LF53L
1
⁄2 3
1
⁄2 89 1
7
⁄8 48
1
⁄2 227
Capacity
MODEL ASME CAPACITY (BTU/HR) CSA CAPACITY
75PSI 100PSI 125PSI 150PSI (BTU/hr)
LF3L 200,000 257,000 314,000 370,000 200,000
LF53L N/A N/A N/A N/A 15,000
ES-LF3L-LF53L 2021 © 2020 Watts
USA: T: [phone] • F: [phone] • Watts.com
Canada: T: [phone] • F: [phone] • Watts.ca
Latin America: T: (52) 81-1001-8600 • Watts.com
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 without 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.
NOTICE
Inquire with governing authorities for local installation requirements
The information contained herein is not intended to replace the full
product installation and safety information available or the experience
of a trained product installer. You are required to thoroughly read all
installation instructions and product safety information before begin-
ning the installation of this product.
NOTICE