Watts 415M1-015 3/4 Relief Valve, Brass, FNPT

The Watts 415M1-015 3/4 is a 3/4" pressure relief valve for low-pressure steam boiler service, factory set at 15 psi. It features a brass body. Rated to 15 psi.

This 3/4 x 3/4 inch dependable, low cost, high capacity safety relief valve is designed for low pressure, steam heating boilers and process equipment used in industrial and commercial applications. It features a brass body, stainless steel spring, top guided stem, NPT threaded male inlet by threaded female outlet (drain) connection and a non-stick PTFE disc-to-metal seat to assure positive shutoff. The factory pressure setting for saturated steam service is set at 15 psi. This valve has an ASME, section IV rating.

Features

• Pressure for saturated steam service set at 15 psi
• Brass body
• Male NPT screwed inlet and female NPT screwed outlet
• Top guided stem and non-stick PTFE disc to metal seat assures positive shutoff
• ASME, section IV rating
• Used for industrial and commercial low pressure applications
• High capacity
• Seat located above drain
• Stainless steel spring

Common Questions

What pressure is this valve set to?

It is factory set to relieve at 15 psi. The setting is fixed and is not field-adjustable.

Is this ASME rated?

Yes — it carries an ASME Section IV rating for low-pressure steam heating boilers and is National Board certified. It is a steam safety valve; do not substitute it for a hot-water ("HV") relief valve, and do not use it above its set pressure.

Can I use this on potable water?

No. This is a boiler valve and is not approved for potable water, and that is true regardless of what the lead-free column says — hydronic boiler water is a closed, treated loop and is not drinking water. For a potable hot water heater or storage tank, use a T&P relief valve listed to ANSI Z21.22 / CSA 4.4 instead.

Specifications

• Type: Relief
• Size: 3/4"
• Inlet Size: 3/4"
• Outlet Size: 3/4"
• Connection: FNPT
• Body Material: Brass
• Max Pressure (psi): 15
• Pack Quantity: 25
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: 415M1-015 3/4
• Certifications: ASME Section IV, NBBI
• Lead-Free: No
• Relief Type: Pressure Only
• Factory Set Pressure (psi): 15
• ASME Code Rating: ASME Section IV (Steam)
• Application: Low-Pressure Steam Boiler
• Connection Configuration: MNPT inlet x FNPT outlet
• Approved for Potable Water: No
• SentryPlus Alert Flood Sensor: No