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ASME Water Pressure Relief Valves

For Pressure Protection of Hot

Water Heating Boilers

Sizes:

⁄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 - 10 bar) with corresponding high ratings

from 650,000 to 14,370,000 BTU/hr. Female inlet and outlet

connections. Sizes

⁄4" - 2" (20 - 50mm).

Series 374A

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

⁄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 correspon-

ding 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 Regulator Company 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.

Important: 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

ES-174A-740

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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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 with-

out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

Series 174A

Series 740

Series 174A, 374, 740

1 2

Résumé du contenu

Page 1 - Series 174A, 374, 740

ASME Water Pressure Relief ValvesFor Pressure Protection of HotWater Heating BoilersSizes: 3⁄4" – 2" (20 - 50mm)Series 174ABronze body safet

Page 2 - Dimensions – Weights

SERIES 174ASet 3⁄4" x 3⁄4" 1" x 1" 11⁄4" x 11⁄4" 11⁄2" x 11⁄2" 2" x 2"Pressure 20 x 20mm 25 x

Modèles reliés 374A | 174A |

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Watts 740 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Accessoires pour l'eau Watts 740. Watts 740 User Manual Manuel d'utilisatio

Résumé du contenu

Modèles reliés 374A | 174A |

Commentaires sur ces manuels

Produits connexes et manuels pour Accessoires pour l'eau Watts 740