The Watts 415M1-008 is a 3/4" pressure relief valve for low-pressure steam boiler service, factory set at 8 psi. It features a brass body. Rated to 15 psi.
This 3/4 by 3/4 inch dependable, low cost, high capacity safety relief valve is designed for pressure cookers and steam cleaning equipment requirements used in low pressure 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 8 psi.
Features
- Pressure for saturated steam service set at 8 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
- Used for pressure cookers and steam cleaning equipment in 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 8 psi. The setting is fixed and is not field-adjustable. Note the 15 psi figure in the specifications is the maximum of the series' pressure range — the ceiling the body is built for, not this valve's relief point. This valve opens at 8 psi. Match it to the appliance nameplate: the relief setting must not exceed the working pressure stamped on the vessel you are protecting.
- 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
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Type: Relief
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Size: 3/4"
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Inlet Size: 3/4"
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Outlet Size: 3/4"
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Connection: FNPT
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Body Material: Brass
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Max Pressure (psi): 15
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Pack Quantity: 25
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: 415M1-008
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Certifications: ASME Section IV, NBBI
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Lead-Free: No
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Relief Type: Pressure Only
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Factory Set Pressure (psi): 8
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ASME Code Rating: ASME Section IV (Steam)
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Application: Low-Pressure Steam Boiler
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Connection Configuration: MNPT inlet x FNPT outlet
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Approved for Potable Water: No
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SentryPlus Alert Flood Sensor: No
