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Manufacturer Resources
Product Specs
- Body Material:
- Iron
- Buy American Act Compliant:
- No
- Ean:
- 98268019209
- Inlet Connection Size:
- 1 1/4 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 1/2 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 383020
- Pressure Range:
- 30 to 75 PSI
- Pressure Relief Setting Psi:
- 30
- Pressure Steam Discharge Capacity:
- 2,105,000 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 1 1/4 – Frequently Asked Questions
1) What pipe size do I need for the Watts 740-030 relief valve inlet and outlet?
The Watts 740 series relief valve in the 1-1/4 inch size has a 1-1/4 inch female NPT inlet and an expanded 1-1/2 inch female NPT outlet. That larger outlet is intentional, so plan the discharge piping at 1-1/2 inch and never reduce it below the valve outlet size.
2) At what pressure does the Watts 740-030 relieve, and can it be adjusted?
It is a factory-set 30 psi valve. The 740 series as a whole covers a 30 to 75 psi range, but you pick that setting by model number, not by adjusting the valve in the field. If your boiler is tagged for a higher set pressure, order the matching 740 model instead of this 30 psi version.
3) Is the Watts 740-030 right for a hot water boiler or a steam boiler?
It is a pressure relief valve for boiler service, rated to 250 F maximum temperature with a steam discharge capacity of 2,105,000 BTU per hour. Protection is pressure only, so it is not a combination temperature and pressure (T and P) valve for a domestic water heater. Size it so the valve's relief capacity equals or exceeds the boiler's gross output.
4) What is the body made of, and does that matter for a closed hydronic loop?
Iron body. That suits closed-loop boiler and hydronic service where the water is not potable. Watts lists the valve as not in scope for lead-free requirements, which is consistent with a non-potable application; do not put it on a domestic hot water line.
5) Can I use the Watts 740-030 on a government or federally funded job with domestic sourcing requirements?
No. This 30 psi iron boiler relief valve is listed as not Buy American Act compliant, so it will not satisfy a spec that requires BAA-compliant product. For those jobs you need a domestically sourced relief valve of the same set pressure and capacity.
6) What Watts part number should I quote for the 1-1/4 inch 30 psi boiler relief valve?
Order it as Watts 740-030 1 1/4, series 740, manufacturer part number 383020. That identifies the 1-1/4 inch inlet, 30 psi set, expanded outlet configuration specifically.
How fast can I get the Watts 740-030 1 1/4 delivered?
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Does the Watts 740-030 1 1/4 come with a warranty?
Absolutely. The Watts 740-030 1 1/4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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