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3/4 In Iron Boiler Pressure Relief Valve, 30 psi, Forged Brass Inlet
Manufacturer Resources
Product Specs
- Body Material:
- Iron
- Buy American Act Compliant:
- USA
- Ean:
- 98268018042
- Gds Status:
- Registered
- Inlet Connection Size:
- 3/4 IN
- Inlet Connection Type:
- Female Threaded
- Inlet Thread Type:
- NPT
- Lead Free:
- Not In Scope
- Maximum Temperature Fahrenheit:
- 250
- Maximum Working Pressure Psi:
- 10
- Outlet Connection Size:
- 3/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 358553
- Pressure Relief Setting Psi:
- 30
- Pressure Steam Discharge Capacity:
- 550,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 374A
- Temperature Relief Fahrenheit:
- 9999
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
- Brand Name:
- Watts
Watts 374A-BRZ-030 – Frequently Asked Questions
1) Will the Watts 374A-BRZ-030 relief valve thread into my 3/4 inch boiler tapping?
Both ends are 3/4 inch female NPT, so it threads onto a 3/4 inch male NPT nipple out of the boiler tapping and takes a 3/4 inch male NPT discharge pipe on the outlet. Since both connections are female, you need a nipple on each side rather than screwing the valve directly into a female tapping.
2) What pressure does the Watts 374A-BRZ-030 pop off at, and is that right for a residential hot water boiler?
It is factory set to relieve at 30 psi, which is the standard setting for a low pressure hydronic hot water boiler rated 30 psi maximum. The setting is fixed, not field adjustable, so if your boiler nameplate calls for a different relief pressure you need a different setting from the 374A range, not this one.
3) Does this Watts 374A valve give temperature relief as well as pressure, like a water heater T and P valve?
No. The 374A-BRZ-030 is a pressure-only relief valve, listed as protection type pressure with no temperature relief element. It is for boiler pressure protection. A domestic water heater needs a combination temperature and pressure (T and P) relief valve instead, which senses water temperature at the thermostat well.
4) What is the BTU discharge capacity of the Watts 374A-BRZ-030, and how do I know it is big enough for my boiler?
Rated at 550,000 BTU per hour of steam discharge capacity. Size the relief valve so its capacity equals or exceeds the boiler's gross input or output rating as stamped on the boiler nameplate, so any boiler up to 550,000 BTU/hr is covered by this 3/4 inch valve. A larger boiler needs a bigger relief valve.
5) What is the Watts 374A-BRZ-030 body made of, and what is the forged brass part?
The valve body is iron, with a forged brass inlet on the connection side. Iron body construction suits closed loop hydronic heating water rather than potable supply. On the lead content question, the 374A is classed as not in scope for lead free requirements, which is consistent with a heating boiler application rather than drinking water.
6) What is the maximum temperature the Watts 374A boiler relief valve can handle?
250 degrees F is the maximum temperature rating, which covers normal hydronic supply temperatures with margin. Mount it in the vertical upright position on the boiler as required for relief valves and run the discharge to a safe termination point.
7) Is the Watts 374A-BRZ-030 acceptable on a federal or public project with domestic sourcing requirements?
Yes. The 374A-BRZ-030 is listed as Buy American Act compliant with USA origin, which is what a government, school district, or public housing procurement officer needs to see for domestic preference clauses.
8) Which Watts part number do I order for a 30 psi 3/4 inch boiler relief valve?
Order Watts model 374A-BRZ-030, manufacturer part number 358553. The suffix 030 is the 30 psi setting, so if you are standardizing several boilers in a building on the same valve that is the number to put on the PO.
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Does the Watts 374A-BRZ-030 come with a warranty?
Absolutely. The Watts 374A-BRZ-030 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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