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3/4 In Bronze Boiler Pressure Relief Valve, 100 psi, Threaded Female Connections
174A-100 3/4 - spec sheet
174A-100 3/4 - spec sheet
Manufacturer Resources
Product Specs
- Body Material:
- Bronze
- Buy American Act Compliant:
- USA
- Ean:
- 98268013191
- 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:
- 75
- Outlet Connection Size:
- 3/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 274683
- Pressure Range:
- 30 to 150 PSI
- Pressure Relief Setting Psi:
- 100
- Pressure Steam Discharge Capacity:
- 1,695,000 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-100 3/4 – Frequently Asked Questions
1) What size and thread does the Watts 174A-100 relief valve connect with?
Both ends are 3/4 inch female NPT. Inlet and outlet are the same size and type, so it threads onto a 3/4 inch NPT boiler tapping and takes a 3/4 inch NPT drop pipe on the discharge side. You supply the discharge piping; nothing is included for it.
2) What pressure does the Watts 174A-100 relieve at, and can it be adjusted?
It is factory set to open at 100 psi. That setting is fixed for this model, not field adjustable. The 174A series covers 30 to 150 psi across its models, so if your boiler is rated below 100 psi you order a lower set model in the same series rather than changing this one.
3) Can I use the Watts 174A-100 on a boiler rated above 100 psi?
No. A relief valve has to be set at or below the vessel's maximum allowable working pressure, and this one opens at 100 psi. On a boiler with a higher rating it will dump constantly during normal operation. Pick the set pressure in the 174A range that matches your boiler nameplate.
4) What temperature can the 174A-100 bronze relief valve handle?
Rated to 250 degrees F maximum. Bronze body, so it handles the wet steam and hot water service a boiler tapping sees. It is a pressure-only relief device, not a temperature and pressure (T&P) valve, so it will not trip on temperature alone. Water heaters needing T&P protection take a different valve.
5) Is the Watts 174A-100 lead free and can I use it on potable water?
It is not a lead free valve. That keeps it to closed-loop heating boiler service, not potable water lines or anything feeding drinking water. For potable applications you need a valve carrying a lead free designation.
6) Does the Watts 174A-100 meet Buy American requirements for a government or institutional job?
Yes, it is flagged Buy American Act compliant with USA origin, which is what procurement on federal, school and municipal work usually asks for on boiler trim.
7) What is the difference between the 75 psi working pressure and the 100 psi setting on this Watts valve?
The 100 psi figure is the relief set point, the pressure at which the valve lifts. The 75 psi maximum working pressure is the system pressure the valve is meant to sit at continuously. Run your normal boiler pressure at or under 75 psi and the valve stays seated; a system that routinely runs closer to the set point will weep.
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts 174A-100 3/4 come with a warranty?
Absolutely. The Watts 174A-100 3/4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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