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Series 174A, 374, 740 Watts Water(系列174 a,374年,740瓦的水)
ES-174A-740
For Hot Water Boiler Applications
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
Series 174A, 374, 740
ASME Water Pressure Relief Valves
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. Series 174A Series 740
Features
• Seat located above drain; water can’t be trapped and
sediment can’t foul seat. Operation
• Non-mechanical seat-to-disc alignment will not stick As thermal expansion conditions develop, pressure builds up to
or freeze.
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