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3/4 In Bronze Boiler Pressure Relief Valve, 125 psi, Threaded Female Connections
174A-125 3/4 - spec sheet
174A-125 3/4 - spec sheet
Manufacturer Resources
Product Specs
- Body Material:
- Bronze
- Buy American Act Compliant:
- USA
- Ean:
- 98268013245
- Inlet Connection Size:
- 3/4 IN
- Inlet Connection Type:
- Female Threaded
- Inlet Thread Type:
- NPT
- Lead Free:
- No
- Maximum Temperature Fahrenheit:
- 250
- Maximum Working Pressure Psi:
- 94
- Outlet Connection Size:
- 3/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 274751
- Pressure Range:
- 30 to 150 PSI
- Pressure Relief Setting Psi:
- 125
- Pressure Steam Discharge Capacity:
- 2,070,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 174A
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
- Brand Name:
- Watts
Watts 174A-125 3/4 – Frequently Asked Questions
1) What size and thread does the Watts 174A-125 boiler relief valve need on the boiler tapping?
Both ends are 3/4 inch female NPT, inlet and outlet. It threads onto a 3/4 inch male NPT nipple off the boiler tapping, and the discharge side takes 3/4 inch male NPT piping down to within a few inches of the floor. No adapters needed if the boiler tapping is 3/4 inch.
2) Will the 174A-125 handle the BTU output of a large commercial boiler?
Steam discharge capacity is 2,070,000 BTU per hour, so it covers boilers rated at or below that input. Sizing a relief valve means matching or exceeding the boiler's rated input, and on a multi-boiler plant you size per boiler, not on the total. Anything above 2,070,000 BTU/hr needs a larger valve.
3) Is the Watts 174A-125 pressure only, or does it also relieve on temperature like a T&P valve?
Pressure only. Protection type is pressure, so it opens on overpressure and nothing else. That is what a hot water or steam heating boiler wants. A domestic water heater is a different job and needs a combination temperature-and-pressure relief valve instead, which this is not.
4) Can I use the Watts 174A-125 on a potable water line or domestic hot water?
No. It is not lead free, so keep it on the closed hydronic or steam side where the water is not consumed. For anything in contact with drinking water, specify a lead free valve.
5) What is the maximum working pressure and temperature on this Watts bronze relief valve?
94 psi maximum working pressure and 250 degrees F maximum temperature. The 94 psi figure is the system pressure the valve is rated to sit at continuously, well below its 125 psi relief point, so the boiler's normal operating pressure needs to stay under 94 psi.
6) Does the Watts 174A-125 3/4 meet Buy American requirements for a government or school project?
It is listed as Buy American Act compliant, USA. That covers the federal and institutional specs that call for domestic origin on mechanical components.
7) What part number do I order for the Watts 174A 3/4 inch at 125 psi?
Order Watts 174A-125 3/4, Watts part number 274751. The number after the series is the relief setting in psi and the fraction is the pipe size, so 174A-30 3/4 would be the same valve set at 30 psi.
8) What is the body made of on the Watts 174A boiler relief valve?
Bronze body. That is what holds up in a hot hydronic system and resists the corrosion you get around a boiler, and it is why the valve is rated to 250 degrees F.
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Does the Watts 174A-125 3/4 come with a warranty?
Absolutely. The Watts 174A-125 3/4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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