Watts M335M2-030 3/4 Relief Valve, Bronze, NPT

The Watts M335M2-030 3/4 is a 3/4" pressure relief valve for hot water boiler service, factory set at 30 psi. It features a bronze body. Rated to 30 psi and up to 250°F.

This 3/4 inch pressure safety relief valve is used in commercial and industrial applications for low pressure, steam heating boilers and process equipment. It consists of a bronze body construction with NPT threaded male inlet and threaded female outlet (drain) connection, stainless steel spring, a top-guided stem, and a non-stick Teflon ® disc-to-metal seating. The pressure relief is set at 30 psi (2.1 bar).

Features

• High heat resisting silicone disc
• Positive shut off
• ASME Section IV at 30 psi set point
• Seat located above drain

Common Questions

What pressure is this valve set to?

It is factory set to relieve at 30 psi. The setting is fixed and is not field-adjustable.

Is this ASME rated?

Yes. It is ASME rated and carries the "HV" code symbol under ASME BPVC Section XIII (the section that replaced Section IV for overpressure protection), and it is National Board (NBBI) certified. Inspectors look for that stamp on the valve body, and it is there.

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): 30
• Pack Quantity: 50
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: M335M2-030 3/4
• Temperature: up to 250°F
• Certifications: ASME Section XIII (HV), NBBI
• Lead-Free: No
• Relief Type: Pressure Only
• Factory Set Pressure (psi): 30
• ASME Code Rating: ASME Section XIII (HV)
• Application: Hot Water Boiler
• Connection Configuration: MNPT inlet x FNPT outlet
• Approved for Potable Water: No
• SentryPlus Alert Flood Sensor: No