Submittal Sheet

Series 3L, 53L
Poppet Type Pressure Relief
Valves for Protection Against
Excessive Pressure
Sizes: 3L:
3
/4" (20mm) 53L:
1
/2" (15mm)
Series 3L and 53L are used for protection against excessive
pressure on domestic storage tanks or tankless water heat-
ers. Similar in construction to Watts Model 10L, the Model 3L
has no temperature relieving element. Model 53L has the basic
design as Model 3L except it is furnished in 1⁄2" (15mm) size
and does not comply with A.S.M.E. requirements. Pressure
range is 75-150psi (5.2-10.3 bar). Series 3L and 53L 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 210 gas shutoff valve on gas water
heaters to shut off gas to heater if water heater temperature
exceeds 210°F (99°C).
Features
• Furnished with test levers
• Relieves excessive pressure on storage tanks
• Relieves excessive pressure on tankless water heaters
• Compatible with Model 210 gas shutoff valves
Models
Solar 3L Use in solar applications. Specify Z9 for stainless
steel lever and pin or outside solar applications.
Model 3L 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 53L (Does not comply with ASME requirements)
Listed and certified by CSA to ANSI Z21-22/
CSA 4.4
Model FP53L Use in fire protection grid systems. Protects
against excessive pressure from thermal expan-
sion or line surge. UL listed. Set at 175psi. Refer
to literature ES-FP53L.
53L
For Residential, Commercial and Industrial Applications
ES-3L-53L
Approvals
ASME*, CSA, NB* (*3L only)
Materials
Body: 3L – Brass
53L – Bronze
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
Maximum system operating pressure must not exceed 75% of
valve set pressure.
Dimensions-Weights
Capacity
modeL Size HeigHt WidtH WeigHt
in mm in mm in mm lbs. gms.
3L
3
⁄4 20 3
11
⁄64 80 1
5
⁄32 40
13
⁄32 181
53L
1
⁄2 15 3
1
⁄2 89 1
7
⁄8 48
1
⁄2 227
ASme CAPACitY (BtU/Hr) CSA CAPACitY
(BtU/Hr)
75PSi 100PAi 125PSi 150PSi
3L 200,000 257,000 314,000 370,000 200,000
53L N/A N/A N/A N/A 15,000
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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3L
ES-3L-53L 1528 © 2015 Watts
USA: Tel: [phone] • Fax: [phone] • Watts.com
Canada: Tel: [phone] • Fax: [phone] • Watts.ca
Latin America: Tel: [phone] • Fax: [phone] • 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.
A Watts Water Technologies Company