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Watts Series 174A, 374, 740 ASMEWater Pressure Relief Valves

ASMEWater 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 connections. 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 corresponding 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 10,700,000
BTU/hr

• 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 #ModelsSize (Dn) in.Size (Dn)mmModel:Height in.Height mmLength in.Length mmWeight lbs.Weight kg.
374A¾ x ¾20 x 20SERIES 174A3⅚92641.13.5
174AM3¾ x ¾20 x 20SERIES 174A5⅙130641.50.7
174AM11 x 125 x 25SERIES 174A1463763.131.4
174AM11¼ x 1¼32 x 32SERIES 174A8³/₆2131216.252.8
174AM1½ x 1½40 x 40SERIES 174A92294⁷/₆1247.253.3
174AM2 x 250 x 50SERIES 174A11⅚29515913.756.2
740M1¾ x 120 x 25SERIES 7405⅚1433761.889
740M1 x 1¼25 x 32SERIES 740184893.131.4
740M1¼ x 1½32 x 40SERIES 7402224⅚1176.132.8
740M1½ x 240 x 50SERIES 7402351337.503.4
740M2 x 2½50 x 65SERIES 74011⅚29517116.507.5
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 corresponding
high BTU/hr ratings from 650,000 to 14,370,000 BTU/hr.
Maximum Temperature: 250ºF (121ºC)
Series. 374A Pressure range: rated up to 550,000 BTU/hr at a 30psi (2 bar)
setting only.
Series 740 Pressure range: 30psi to 75psi (2 to 5 bar) with corresponding
high ratings from 925,000 to 10,700,000 BTU/hr.
Maximum Temperature: 250ºF (121ºC)


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