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Manufacturer Resources
Product Specs
- Body Material:
- Iron
- Buy American Act Compliant:
- No
- Ean:
- 98268018844
- 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:
- 20
- Outlet Connection Size:
- 1 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 382008
- Pressure Range:
- 30 to 75 PSI
- Pressure Relief Setting Psi:
- 30
- Pressure Steam Discharge Capacity:
- 925,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 740
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
- Brand Name:
- Watts
Watts 740-030 3/4 – Frequently Asked Questions
1) What pipe size do I need for the Watts 740-030 3/4 boiler relief valve inlet and outlet?
Inlet is 3/4 inch female NPT and the outlet is expanded to 1 inch female NPT. So you thread it into a 3/4 inch boiler tapping, then run the discharge line in 1 inch pipe. Plan on a 3/4 x 1 inch reducing situation only if you were expecting matching ports, and never bush the 1 inch outlet down.
2) At what pressure does the Watts 740-030 relieve, and what boiler is it right for?
It is factory set to open at 30 psi, which is the standard setting for a residential or light commercial hot water heating boiler. The 740 series covers 30 to 75 psi across the range, so if your boiler nameplate calls for a higher maximum allowable working pressure you need the matching setting rather than this one. The valve is a pressure-only relief device, not a combination temperature and pressure valve.
3) Can I use this Watts 740 valve on a domestic water heater?
No. The 740-030 is a boiler relief valve protecting against pressure only, with an iron body and a steam discharge rating. A water heater needs a combination temperature and pressure (T and P) relief valve with a probe that senses 210 F water. Use the 740 on a hot water or steam heating boiler and specify a T and P valve for potable storage.
4) Is the Watts 740-030 lead free and can I put it on drinking water lines?
It is an iron bodied boiler valve and is not within the scope of lead free potable water requirements, so it belongs on closed hydronic heating systems, not on domestic water. For potable service pick a valve built and marked for lead free use.
5) What temperature can the Watts 740 boiler relief valve handle?
Maximum operating temperature is 250 F, which covers normal hot water heating and low pressure steam service. It is not for systems running hotter than that.
6) Does the Watts 740-030 meet Buy American Act requirements for a government job?
No. The 740-030 3/4 is listed as not Buy American Act compliant, so on a federal or BAA-restricted project you will need a domestically sourced relief valve instead.
How fast can I get the Watts 740-030 3/4 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 740-030 3/4 come with a warranty?
Absolutely. The Watts 740-030 3/4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Watts 740-030 3/4?
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