Watts L315M2-008 3/4" Relief Valve, Bronze, NPT

The Watts L315M2-008 is a 3/4" pressure relief valve for low-pressure steam boiler service, factory set at 8 psi. It features a bronze body. Rated to 15 psi.

This 3/4 x 3/4 inch high capacity safety relief valve is designed for pressure cookers and steam cleaning equipment with low pressure requirements. It features a bronze body with an extended inlet shank, stainless steel spring, top guided stem, NPT threaded male inlet x threaded female outlet (drain) connection, and a non-stick PTFE® disc to metal seating ensures 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
• Bronze body with satin chrome finish and extended shank to accommodate insulation
• NPT male inlet x NPT female outlet
• Top guided stem and non-stick PTFE disc to metal seat assures positive shutoff

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

• Type: Relief
• Size: 3/4"
• Inlet Size: 3/4"
• Outlet Size: 3/4"
• Connection: NPT
• Body Material: Bronze
• Max Pressure (psi): 15
• Pack Quantity: 50
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: L315M2-008
• Certifications: ASME Section IV, NBBI
• Lead-Free: No
• Relief Type: Pressure Only
• Factory Set Pressure (psi): 8
• 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