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Manufacturer Resources
Product Specs
- Application:
- Boiler
- Body Material:
- Bronze
- Country Of Origin:
- United States
- Inlet Connection Size:
- 3/4 IN
- Inlet Connection Type:
- Female Threaded
- Inlet Thread Type:
- NPT
- Maximum Temperature:
- 250°F
- Maximum Working Pressure:
- 38
- Outlet Connection Size:
- 3/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Pressure Range:
- 30 to 150 PSI
- Pressure Relief Setting:
- 50 PSI
- Pressure Steam Discharge Capacity:
- 950,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 174A
- Test Lever:
- Yes
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
Watts 274513 – Frequently Asked Questions
1) What pressure does the Watts 174A 0274513 relief valve open at?
The Watts 174A model 0274513 is factory set to relieve at 50 psi. That setting is fixed, not field adjustable, so on a hydronic boiler rated for 30 psi working pressure you want the 30 psi version of the series instead. The 174A family covers settings from 30 to 150 psi, so match the valve setting to the boiler's maximum allowable working pressure on the data plate.
2) Is this a 3/4 inch NPT valve on both the inlet and the outlet?
Both ends are 3/4 inch female NPT on the 0274513, inlet and outlet. So it threads onto a 3/4 inch male nipple at the boiler tapping, and the discharge side takes a 3/4 inch male adapter for the drain line. No union or sweat adapter is included, so plan on a nipple at the boiler and a pipe or adapter for the discharge run.
3) Where does this relief valve get installed on the boiler?
It threads into the boiler's dedicated relief tapping on the supply side, vertical with the outlet pointed down, with no shutoff valve anywhere between the boiler and the valve. Piping is straightforward: 3/4 inch male nipple into the female NPT inlet, and a full-size 3/4 inch discharge line off the outlet run down to within a few inches of the floor or to a safe point of discharge. Never reduce or plug the discharge.
4) Is this valve a temperature and pressure (T and P) relief valve for a water heater?
No. The 0274513 is pressure-only protection, no temperature probe, and it is intended for boiler service. A domestic water heater needs a T and P valve with an extension element that senses water temperature in the tank. Do not substitute this one into a water heater tapping.
5) Does this Watts 174A come with a test lever?
Yes, the 0274513 has a manual test lever so you can lift and flush the seat during annual service without dropping system pressure. That is what most maintenance schedules call for on hydronic relief valves, and it is how you check the valve is not seized shut.
6) What is the temperature limit on this bronze boiler relief valve?
Maximum temperature is 250 degrees F on the 0274513, which covers normal hydronic supply water with margin. The body is bronze, so it holds up in closed-loop boiler water better than a plated steel part. Maximum working pressure is listed at 38.
7) Is the Watts 0274513 made in the USA?
Country of origin on the 0274513 is the United States, which matters if you are procuring for a government or institutional job with domestic-content requirements. Order it by Watts part number 274513, series 174A.
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Does the Watts 274513 come with a warranty?
Absolutely. The Watts 274513 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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