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3/4 In Bronze Boiler Pressure Relief Valve, 150 psi, Threaded Female Connections
0274836 - spec sheet
0274836 - spec sheet
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:
- 113
- Outlet Connection Size:
- 3/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Pressure Range:
- 30 to 150 PSI
- Pressure Relief Setting:
- 150 PSI
- Pressure Steam Discharge Capacity:
- 2,445,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 174A
- Test Lever:
- Yes
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
Watts 274836 – Frequently Asked Questions
1) What pressure does the Watts 174A 0274836 relief valve open at?
The Watts 174A model 0274836 is factory set to relieve at 150 psi. That is a fixed setting, not field adjustable, and it is the top of the 30 to 150 psi range the 174A series covers. If your boiler is tagged for a lower maximum allowable working pressure, you need the 174A set at or below that tag value instead of the 150 psi version.
2) What size and type of connections does this Watts boiler relief valve have?
Both ends are 3/4 inch female NPT, inlet and outlet. So it threads onto a 3/4 inch male nipple off the boiler tapping, and the discharge side takes a 3/4 inch male-threaded pipe. Run the discharge full size in rigid pipe to within a few inches of the floor with no valve in the line.
3) Is this Watts 174A valve for a hot water boiler or a potable water heater?
It is a boiler valve. The 174A is a pressure-only relief valve for boiler service, and it does not include the temperature element a water heater T and P valve uses. For a domestic water heater you want a combination temperature and pressure relief valve, not this one.
4) Can I use the 150 psi Watts 174A on a typical residential hydronic boiler?
Usually not. Residential hot water boilers are commonly tagged 30 psi maximum allowable working pressure, and a relief valve must be set at or below the boiler's rating. The 150 psi version of the 174A is for high pressure boiler installations. The series covers 30 to 150 psi settings, so order the setting that matches your boiler nameplate.
5) What is the maximum temperature this Watts bronze relief valve can handle?
250 degrees F is the maximum temperature for the 174A, which covers normal hot water boiler operating temperatures with margin. The body is bronze, so it holds up in closed-loop hydronic systems better than a plated steel body.
6) Does the Watts 174A relief valve have a test lever for annual maintenance?
Yes, the 0274836 comes with a manual test lever. Maintenance crews use it to lift the disc and flush debris off the seat during periodic testing, which is standard practice on boiler relief valves. Make sure the discharge pipe is terminated safely before you lift it, since the water coming out is at boiler temperature, up to 250 degrees F.
7) Where is the Watts 0274836 relief valve made?
The 174A model 0274836 is manufactured in the United States, which matters on public and institutional jobs carrying domestic sourcing requirements.
How fast can I get the Watts 274836 delivered?
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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 274836 come with a warranty?
Absolutely. The Watts 274836 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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