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Manufacturer Resources
Product Specs
- Body Material:
- Iron
- Buy American Act Compliant:
- No
- Ean:
- 98268019148
- Inlet Connection Size:
- 1 IN
- Inlet Connection Type:
- Female Threaded
- Inlet Thread Type:
- NPT
- Lead Free:
- Not In Scope
- Maximum Temperature Fahrenheit:
- 250
- Maximum Working Pressure Psi:
- 56
- Outlet Connection Size:
- 1 1/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 382821
- Pressure Range:
- 30 to 75 PSI
- Pressure Relief Setting Psi:
- 75
- Pressure Steam Discharge Capacity:
- 2,649,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 740
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
- Brand Name:
- Watts
Watts 740-075 1 – Frequently Asked Questions
1) What pipe size does the Watts 740-075 boiler relief valve thread into?
The inlet is 1 inch female NPT, so it threads onto a 1 inch male NPT tapping or nipple off the boiler. The outlet is expanded to 1-1/4 inch female NPT, which is why your discharge piping steps up a size from the inlet. Plan the drain line in 1-1/4 inch pipe run full size to a safe point of discharge.
2) At what pressure does the Watts 740-075 relief valve pop off?
It is factory set to relieve at 75 psi. That makes it a match for a hot water boiler whose system working pressure sits below that set point, not for a 30 psi residential boiler where a lower setting is required. The 740 series covers 30 to 75 psi across its set-point options, and the -075 is the top of that band.
3) Will the Watts 740-075 handle the output of my boiler?
Its steam discharge capacity is 2,649,000 BTU per hour. Size the valve so that rated capacity equals or exceeds the boiler's gross output. If your boiler puts out more than that, this valve is undersized and you need a larger relief valve or multiple valves.
4) What is the body made of, and is that alright for a closed hydronic loop?
The body is iron. That is normal for a closed hot water heating loop, where the water is not being consumed. It is not a potable-water part: the valve is classified as not in scope for lead-free requirements, so keep it on heating service and use a lead-free T and P valve on any drinking water application.
5) Can I use the Watts 740-075 on a federal or government-funded job?
No. The 740-075 is not Buy American Act compliant, so on a project carrying BAA or similar domestic-sourcing language it will not pass submittal. For those jobs specify a relief valve documented as BAA compliant.
6) What does "expanded outlets" mean on the Watts 740 relief valve?
It means the discharge side is one pipe size larger than the inlet: 1 inch in, 1-1/4 inch out. The bigger outlet keeps back pressure down when the valve blows. Practically, order your discharge piping and any fittings in 1-1/4 inch rather than matching the 1 inch inlet.
7) How do I identify the exact Watts relief valve I need to reorder?
The model is 740-075 1 in the Watts 740 series, carried under manufacturer part number 382821. The suffix tells you the set point (075 for 75 psi) and the trailing 1 is the 1 inch inlet, so a valve marked differently in either position is a different pressure or a different pipe size.
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts 740-075 1 come with a warranty?
Absolutely. The Watts 740-075 1 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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