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3/4 IN Brass Poppet Type Calibrated Pressure Relief Valve, 1/2 IN Outlet, Adjustable 50-175 psi
0372271 - spec sheet
0372271 - spec sheet
Manufacturer Resources
Product Specs
- Application:
- Secondary Relief
- Body Material:
- Brass
- Gpm When Relieved:
- Does Not Apply to Product
- Inlet Connection Size:
- 3/4 IN
- Inlet Connection Type:
- Male Threaded
- Inlet Thread Type:
- NPT
- Maximum Temperature:
- 180°F
- Maximum Temperature Fahrenheit:
- 180
- Maximum Working Pressure:
- 300
- Outlet Connection Size:
- 1/2 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Pressure Range:
- 50 to 175 PSI
- Pressure Relief Setting:
- 150 PSI
- Pressure Relief Setting Psi:
- 150
- Pressure Steam Discharge Capacity:
- Does Not Apply to Product
- Protection Type:
- Pressure
- Series:
- 530C
- Shank Length:
- Does Not Apply To Product
- Temperature Steam Discharge Capacity:
- Does Not Apply to Product
- Test Lever:
- No
- Thermostat Material:
- Does Not Apply To Product
- Thermostat Probe Length:
- Does Not Apply To Product
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
Watts 372271 – Frequently Asked Questions
1) What size and type of threads does the Watts 530C relief valve, model 372271, have?
Inlet is 3/4 inch male NPT and the outlet is 1/2 inch female NPT. So it threads directly into a 3/4 inch female NPT tapping on the tank, header, or tee, and the discharge line reduces to 1/2 inch pipe run to a safe point of discharge. If your opening is 3/4 inch male, you need a coupling or a different valve.
2) What pressure does the Watts 372271 relief valve come set at, and can I change it?
It ships set at 150 psi and is adjustable across a 50 to 175 psi range, so one part covers a lot of different system set points. Set it below the rating of the weakest component it protects, and remember it is a pressure-only relief valve, not a temperature and pressure (T and P) valve.
3) Can I use this Watts valve as the T and P relief valve on a water heater?
No. The 530C model 372271 is a pressure-only relief valve intended for secondary relief duty, with no temperature element. A water heater needs an ASME or listed temperature and pressure relief valve with a thermostat probe sized to the tank tapping. Use this one downstream of a pressure reducing valve, on a closed loop, or as backup pressure protection where the code-required T and P valve is already in place.
4) Does this Watts relief valve have a test lever?
No test lever on model 372271. If your maintenance procedure or local inspector wants a valve you can lift and flush manually, specify a lever-equipped relief valve instead. Without a lever, verification means checking system pressure against the set point rather than manually tripping the valve.
5) What are the temperature and pressure limits on the Watts 530C 372271?
Maximum working pressure is 300 psi and maximum temperature is 180 degrees F. That covers domestic cold and hot water service and hydronic loops running at normal temperatures, but it is not a steam valve and it is not rated for boiler water above 180 F.
6) Is the body brass, and will it hold up on a potable water system?
The body is brass, which is the standard material for potable water relief valves in domestic and commercial plumbing. Brass handles the 300 psi working pressure and 180 F service limit of this valve without the corrosion problems of plain steel on wet duty.
How fast can I get the Watts 372271 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 372271 come with a warranty?
Absolutely. The Watts 372271 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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