Watts 315M2-015 3/4" Relief Valve, Bronze, NPT

The Watts 315M2-015 is a 3/4" pressure relief valve for low-pressure steam boiler service, factory set at 15 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 low pressure, steam heating boilers and process equipment used in industrial and commercial applications. It features a bronze body, 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 15 psi. This valve has an ASME, section IV rating.

Features

• Pressure for saturated steam service set at 15 psi
• Bronze body
• 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 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: NPT
• Body Material: Bronze
• Max Pressure (psi): 15
• Pack Quantity: 50
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: 315M2-015
• 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