[PDF] Series 174A, 374, 740 - Watts

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Series 174A, 374, 740 - Watts

For Pressure Protection of Hot Water Heating Boilers Sizes: 3⁄4" – 2" (20 - 50mm) Series 174A Bronze body safety relief valves for pressure protection only

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For Pressure Protection of Hot

Water Heating Boilers

Sizes:

3

4" - 2" (20 - 50mm)

Series 174A

Bronze body safety relief valves for pressure protection only of all types of hot water heating boiler equipment. Pressure range 30 to 150psi (2.1 - 10 bar) with corresponding high rat ings from 650,000 to 14,370,000 BTU/hr. Female inlet and outlet connections. Sizes 3

4" - 2" (20 - 50mm).

Series 374A

Iron body with forged brass inlet, 550,000 BTU/hr rating. 3

4" (20mm) only.

Series 740

Iron body with expanded outlets for hot water space heating boilers. Pressure range 30 to 75psi (2 to 5 bar) with corre sponding high ratings from 925,000 to 10,700,000 BTU/hr.

Features

Seat located above drain; water can't be trapped and sediment can't foul seat. Non-mechanical seat-to-disc alignment will not stick or freeze. Water seal of high temperature resisting material isolates spring working parts from water during relief.*Specifications

Boiler Relief Valves

An ASME Section IV certified pressure relief valve shall be installed on each boiler as noted. The valve shall have a BTU rating in excess of the BTU rating of the boiler's heating output. Each hot water space heating boiler shall be equipped with a pressure relief valve set to relieve below the maximum boiler working pressure. The valve shall feature a raised seat and non-mechanical disc alignment. Working parts and spring shall be isolated from any discharge by a high temperature resistant material.* Valve shall be a Watts Series 174A, 374A or 740.

Operation

As thermal expansion conditions develop, pressure builds up to the setting of the relief valve. This will cause discharging of small quantity of water. Should operating controls fail, permitting runaway firing, the boiler water may reach steam temperatures. The valve will then open to discharge steam at the rate or faster than the boiler can generate it, thus restoring system pressure to a safer level. The discharge line must be the same size as the valve outlet, and must pitch downward from the valve to a safe place for disposal. Valve lever must be tripped at least once a year to ensure that waterways are clear. This device is designed for emergency safety relief and shall not be used as an operating control.

For Hot Water Boiler Applications

Series 174A

Series 740

Series 174A, 374, 740

ASME Water Pressure Relief ValvesJob Name ------------------ ------- Contractor ------------------

Job Location

----- Approval ------------------

Engineer

--------- Contractor's P.O. No. ------------------

Approval

--------- Representative ------------------ ----Watts product specifications in U.S. customary units and metric are appr oximate and are provided for reference only. For precise measurements, please contact Watts Technical Service. Watts reserves the right to chan ge or modify product design, construction, specificatio ns, or materials with out prior notice and without incurring any obligation to make such chang es and modifications on Watts products previously or su bsequently sold.It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Before installing standard material product, consult your local water authority, building and plumbing codes. 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. * Does not apply to 374A

Materials

Series 174A

• Bronze body construction • Nonmetallic disc-to-metal seating

Series 740

• Iron body construction • Nonmetallic disc-to-metal seating

Pressure - Temperature

Series 174A

Pressure range: 30psi to 150psi (2 to 10 bar) with correspond ing high BTU/hr ratings from 650,000 to 14,370,000 BTU/hr.

Maximum Temperature: 250 ºF (121 ºC)

Series. 374A

Pressure range: rated up to 550,000 BTU/hr at a 30psi (2 bar) setting. (Other settings available)

Series 740

Pressure range: 30psi to 75psi (2 to 5 bar) with corre sponding high ratings from 925,000 to 10,700,000 BTU/hr.

Maximum Temperature: 250 ºF (121 ºC)

Standards

Tested and rated by the National Board of Boiler and Pressure Vessel Inspectors to the requirements of ASME. Meets Military Spec. MIL-V-18634B, Type I, Class 3A, Style A (Bronze Body),

Style B (Iron Body).

ASME

Dimensions - WeightsCapacity*

BTU/hr Steam Pressure Discharge CapacitiesAs tested and rated by the National Board of Boiler and Pressure Vessel Inspectors

SERIES 174A

Size (Dn)HeightLengthWeight

Modelin.mmModelin.mminmmlbs.kg.

374A
3 4 x 3

420 x 20-3

1 2902
1

2641.20.5

174A
3 4 x 3

420 x 20M34

1 21162
3

4671.20.5

174A1 x 125 x 25M15

3

41443761.90.9

174A1
1 4 x 1 1

432 x 32M18

1 22134
1

41094.62.1

174A1
1 2 x 1 1

240 x 40M9

1 42324
3

41226.93.1

174A2 x 250 x 50M11

1 22906
1

216214.46.5

SERIES 740

740
3

4 x 120 x 25M15

5

81433761.889

7401 x 1

1

425 x 32M7

1 41843
1

2893.131.4

7401
1 4 x 1 1

232 x 40M8

3 42224
5

81176.132.8

7401
1

2 x 240 x 50M9

1 42355
1

41337.503.4

7402 x 2

1

250 x 65M11

5 82956
3

417116.507.5

SERIES 174A

Set

Pressure4⁷434⁷4" x 4⁷434⁷4" 1" x 1" 14⁵414⁵4" x 14⁵414⁵4" 12⁵212⁵2" x 12⁵212⁵2" 2" x 2"

20 x 20mm25 x 25mm32 x 32mm40 x 40mm50 x 50mm

psibarModel M3Model M1Model M1Model M Model M

SERIES 740

Set

Pressure

3

4" x 1" 1" x 1

1 4" 1 1

4" x 1

1 2" 1 1

2" x 2" 2" x 2

1 2"

20 x 25mm25 x 32mm32 x 40mm40 x 50mm50 x 65mm

psibarModel M1Model MModel MModel M Model M

ES-174A-740 1552

© 2015 Watts

USA: Tel: (978) 689-6066 • Fax: (978) 975-8350 • Watts.com

Canada:

Tel: (905) 332-4090 • Fax: (905) 332-7068 •

Watts.ca

Latin America:

Tel: (52) 81-1001-8600 • Fax: (52) 81-8000-7091 •

Watts.comA Watts Water Technologies Company

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