Watts 53L User Manual

For Residential, Commercial and Industrial Applications

ES-3L-53L

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Engineer

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Approval

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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 heaters. 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
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

• Bronze bodies

• Furnished with test levers

• Relieves excessive pressure on storage tanks

• Relieves excessive pressure on tankless water heaters

• Model 3L is ASME approved

• Model 53L is CSA certified and is furnished in

• Compatible with Model 210 gas shutoff valves

Models

Solar 3L Use in solar applications. Specify Z9 for stainless

Model 3L ASME construction/Tested, listed and certified

Model 53L Does not comply with ASME requirements/Listed

Model 53 Model 53L without test lever

Model

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.

steel lever and pin or outside solar applications.

by the National Board of Boiler and Pressure

Vessel Inspectors

and certified by CSA

FP53L

1

⁄2" (15mm) size and does not comply

1

/2" size

Use in fire protection grid systems. Protects
against excessive pressure from thermal expan­sion or line surge. UL listed. Set at 175psi, 185psi,
260psi, & 310psi. For additional information, refer
to literature ES-FP53L.

Materials

Body: Bronze
Spring: Stainless steel
Disc: Silicone

Pressure

Pressure range: 75-150psi (5.2-10.3 bar)
Standard settings: 75, 100, 125 and 150psi

NOTE: 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

model Size HeigHt WidtH WeigHt verSion

in mm in mm in mm lbs. gms.

3L 3⁄4 20 31⁄2 89 13⁄4 44 5⁄8 284 M7
53L

Model 3L *3⁄4" (20mm) size CSA and ASME

NOTE: 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.

1

⁄2 15 31⁄2 89 17⁄8 48 1⁄2 227 M7

3L

(5.2, 6.9, 8.6 and 10.3 bar)

53L

USA: Tel. [phone] • Fax: [phone] • www.watts.com
Canada: Tel. [phone] • Fax: [phone] • www.watts.ca

ES-3L-53L 1350 © 2013 Watts

A Watts Water Technologies Company