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Watts® Temperature & Pressure Relief Valve
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Watts
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Watts® Series 174A, 374, 740 ASME Water Pressure Relief Valves
Watts® Series 174A, 374, 740 ASME Water Pressure Relief Valves
Features
- • Series 174A: Bronze body safety relief valve for pressure protection of hot water heating boiler equipment
- • Pressure range: 30 to 150 psi (2.1 to 10 bar)
- • High ratings from 650,000 to 14,370,000 BTU/hr
- • Female inlet and outlet connections
- • Sizes: ¾" to 2" (20–50 mm)
- • Series 374A: Iron body with forged brass inlet
- • Rating: 550,000 BTU/hr
- • Size: ¾" (20 mm) only
- • Series 740: Iron body with expanded outlets for hot water space heating boilers
- • Pressure range: 30 to 75 psi (2 to 5 bar)
- • High ratings from 925,000 to 10,700,000 BTU/hr
- • Seat located above drain; water cannot be trapped and sediment cannot foul seat
- • Non-mechanical seat-to-disc alignment helps prevent sticking or freezing
- • High-temperature-resistant water seal isolates spring and working parts from water during relief
Description
Watts Series 174A, 374A and 740 ASME Water Pressure Relief Valves are designed to provide pressure protection for hot water heating boilers and related hydronic heating systems.
The Watts Series 174A features bronze body construction and is available in pressure settings from 30 to 150 psi, with sizes from ¾" to 2". The Series 374A combines an iron body with a forged brass inlet, while the Series 740 is designed for hot water space heating boiler applications requiring higher discharge capacities.
These ASME-rated pressure relief valves incorporate a non-mechanical seat-to-disc alignment that helps prevent sticking or freezing. The seat is positioned above the drain to help prevent trapped water and sediment accumulation, while a high-temperature-resistant water seal protects the spring and working components during relief operation.
Contact Watercare Products Singapore for assistance selecting a suitable Watts Series 174A, 374A or 740 ASME Water Pressure Relief Valve according to the required pressure setting, connection size and boiler capacity.
Features
- Stroke
- 4 Stroke
- Max Power
- 62kW/6000 (r/min)
- Cylinders
- 2 Cylinder
- Max Torque
- 101N·m/5000 (r/min)
- Displacement (ml)
- 1000CC
