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3/4 In Bronze Boiler Pressure Relief Valve, 150 psi, Threaded Female Connections
174A-150 3/4 - spec sheet
174A-150 3/4 - spec sheet
Manufacturer Resources
Product Specs
- Body Material:
- Bronze
- Buy American Act Compliant:
- USA
- Ean:
- 98268013283
- 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:
- 113
- Outlet Connection Size:
- 3/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 274836
- Pressure Range:
- 30 to 150 PSI
- Pressure Relief Setting Psi:
- 150
- Pressure Steam Discharge Capacity:
- 2,445,000 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-150 3/4 – Frequently Asked Questions
1) Will the Watts 174A-150 thread into a 3/4 inch NPT tapping on my boiler?
Yes. The 174A-150 has 3/4 inch female NPT on both the inlet and the outlet, so it threads straight onto a 3/4 inch male NPT nipple off the boiler tapping, and the discharge line threads into the outlet the same way. No adapters needed if your tapping is 3/4 inch.
2) Is the 174A-150 the right relief valve for a hot water boiler, or do I need a temperature and pressure valve?
The 174A-150 is a pressure-only relief valve. It protects against overpressure and has no temperature element, so it is used on boiler and hot water heating applications where pressure is the hazard being relieved. If your code requires combined temperature and pressure protection, such as on a domestic water heater, you need a T and P valve instead, not this one.
3) What pressure does the Watts 174A-150 open at, and can it be adjusted?
It is factory set to relieve at 150 psi. The 174A series as a whole spans 30 to 150 PSI set points, but each valve is a fixed factory setting, so if you need a lower relief point, order the 174A at that setting rather than trying to change this one. Note the valve is also rated to a maximum working pressure of 113 psi, so the system operating pressure has to sit below that.
4) Can I use the Watts 174A-150 on a potable domestic water system?
No. The 174A-150 is not lead free, so keep it off potable water service. It is a bronze body valve intended for closed boiler and heating loops. For anything that feeds drinking water, specify a lead free rated relief valve instead.
5) I need to replace an existing boiler relief valve. How do I confirm the Watts 174A-150 matches what's on the boiler now?
Check three things off the old valve's tag: the set pressure must be 150 psi, the BTU capacity must be at or below 2,445,000 BTU/hr, and the connections must be 3/4 inch NPT. If the existing valve is set lower, say 30 psi on a residential hydronic boiler, this is the wrong one and you want a 174A at that lower setting. The 174A line runs 30 to 150 psi, so the series covers the common set points.
6) What temperature can the 174A-150 handle on a high temperature hydronic loop?
Maximum rated temperature is 250 degrees F. That covers standard hot water heating loops comfortably. The bronze body handles the wet heat, but if your system runs above 250 F, this valve is not the one.
7) Does this Watts relief valve meet Buy American requirements for a government or institutional job?
The 174A-150 is flagged Buy American Act compliant with USA origin, which is what a federal, municipal, or public school procurement package normally asks for on a submittal. Cite it as Watts 174A-150 3/4, part number 274836.
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Does the Watts 174A-150 3/4 come with a warranty?
Absolutely. The Watts 174A-150 3/4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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