Watts LF53L User Manual
Series lf3l, lf53l, Lead free, Sizes: lf3l
Series LF3L, LF53L
Poppet Type Pressure Relief
Valves for Protection Against
Excessive Pressure
Sizes: LF3L:
3
⁄
4
" (20mm) LF53L:
1
⁄
2
" (15mm)
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
" (15mm) size
and does not comply with ASME requirements. Pressure range is
75-150psi (5.2-10.3 bar). Series LF3L and LF53L come in standard
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 conjunction with
the Model LF210 gas shutoff valve on gas water heaters to shut off
gas to heater if water heater temperature exceeds 210°F (99°C).
The LF3L and LF53L features Lead Free* construction to comply
with Lead Free* installation requirements.
Features
• Lead Free* cast copper silicon alloy bodies
• Furnished with test levers
• Relieves excessive pressure on storage tanks
• Relieves excessive pressure on tankless water heaters
• Model LF3L is ASME approved
• Model LF53L is CSA certified and is furnished in
1
⁄
2
" size
• Compatible with Model LF210 gas shutoff valves
Models
Model LF3L
ASME construction/Tested, listed and certified by
the National Board of Boiler and Pressure Vessel
Inspectors
Model LF53L Does not comply with ASME requirements
Listed and certified by CSA
Model LF53
Model 53L without test lever
LF3L
LF53L
For Residential, Commercial and Industrial Applications
ES-LF3L-LF53L
model
Size
HeigHt
WidtH
WeigHt
verSion
in
mm
in
mm
in
mm
lbs.
gms.
LF3L
3
⁄
4
20
3
1
⁄
2
89
1
3
⁄
4
44
5
⁄
8
284
M7
LF53L
1
⁄
2
15
3
1
⁄
2
89
1
7
⁄
8
48
1
⁄
2
227
M7
Model LF3L
3
⁄
4
" (20mm) size CSA and ASME
Materials
Body:
Lead Free* cast copper silicon alloy
Spring: Stainless steel
Disc: Silicone
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
On all the above pressure relief valves, pressure setting should be
not less than 25-30 lbs. above the maximum service main pressure.
Dimensions-Weights
ES-LF3L-LF53L 1324
© 2013 Watts
USA: Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
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.
A Watts Water Technologies Company
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Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location –––––––––––––––––––––––––––––––––––––––––
Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer –––––––––––––––––––––––––––––––––––––––––––––
Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval –––––––––––––––––––––––––––––––––––––––––––––
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LEAD FREE
*
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.