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Watts Series 174A, 374, 740 ASME Water Pressure Relief Valves

ASME Water Pressure Relief Valves
Series 174A, 374, 740

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 co nnect ions. Size s 3⁄4” - 2” (20 - 50mm).

Series 374A
Iron body with forged bronze 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 orresponding high ratings from 925,000 to 10,700,000 BTU/hr.

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 co nnect ions. Size s 3⁄4” -
2” (20 - 50mm).
Series 374A
Iron body with forged bronze 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 orresponding high ratings from 925,000 to 10,700,00

• 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.

Select a link under the "item" tab below to order.

Cat #TypeSize (Dn) in.Size (Dn)mmModel:Height in.Height mmLength in.Length mmWeight lbs.Weight kg.Application:
374ASERIES 174A3⁄4 x 3⁄420 x 2035⁄89221⁄2641.13.5
174ASERIES 174A3⁄4 x 3⁄420 x 20M351⁄813021⁄2641.50.7
174ASERIES 174A1 x 125 x 25M153⁄41463763.131.4
174ASERIES 174A11⁄4 x 11⁄432 x 32M183⁄821343⁄41216.252.8
174ASERIES 174A11⁄2 x 11⁄240 x 40M922947⁄81247.253.3
174ASERIES 174A2 x 250 x 50M115⁄829561⁄415913.756.2
740SERIES 7403⁄4 x 120 x 25M155⁄81433761.889
740SERIES 7401 x 11⁄425 x 32M71⁄418431⁄2893.131.4
740SERIES 74011⁄4 x 11⁄232 x 40M83⁄422245⁄81176.132.8
740SERIES 74011⁄2 x 240 x 50M91⁄423551⁄41337.503.4
740SERIES 7402 x 21⁄250 x 65M115⁄829563⁄417116.507.5


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