Watts 0346045 415 Valve

Technical professionals require field-ready reliability, and the Watts 0346045 415 Valve delivers consistent overpressure protection for low-pressure steam heating boilers and industrial process equipment. This ASME Section IV rated safety relief valve is engineered with a forged brass body and a 3/4 inch NPT male inlet by 3/4 inch NPT female outlet (drain) configuration. Designed specifically for saturated steam service, it features a factory-set relief pressure of 15 PSI with a high-capacity discharge rate of 450 lbs/hr. The internal assembly includes a stainless steel spring and a top-guided stem to ensure precise alignment and repeatable performance. To prevent common maintenance issues like seat leakage or sticking after long periods of inactivity, it utilizes a non-stick PTFE (Teflon) disc-to-metal seat. This Watts 415-M1 relief valve is a direct replacement for legacy 415-3/4 and 415-3/4-15 models, making it a standard choice for HVACR contractors servicing commercial steam systems.

• ASME Section IV Certified: Ensures compliance with rigorous safety standards for commercial and industrial steam systems.
• Non-Stick PTFE Seating: The Teflon disc-to-metal seat prevents bonding and ensures a positive shutoff every time.
• Superior Drainage: Engineered with the seat located above the drain to prevent sediment buildup and corrosion at the sealing surface.
• Durable Construction: Heavy-duty forged brass body and stainless steel spring provide long-term resistance to harsh steam environments.
• High Discharge Capacity: Rated for 450 PPH, providing rapid pressure relief to protect sensitive boiler heat exchangers.

What is the difference between the Watts 415 and the 415-M1?
The 415-M1 (Ordering Code 0346045) is the current refined version of the legacy 415 series, specifically utilizing a forged brass body for the 3/4" size to improve structural integrity over older cast versions.

Can this valve be used for water pressure relief applications?
No, this is a steam safety relief valve. It is specifically rated and capacity-certified by the National Board for saturated steam service. For hydronic or potable water systems, a water-rated relief valve (like the Watts 3L or 174A series) must be used.

Is this valve compatible with older 415-3/4-15 models?
Yes, the Watts 0346045 is the direct functional replacement for most 3/4" 15# 415 series valves. Always verify that your system's required discharge capacity (PPH) does not exceed 450 lbs/hr before installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.