Watts 0383368 Valve

The Watts 0383368 is a high-capacity Series 740 iron body boiler pressure relief valve engineered specifically for heavy-duty protection in hot water space heating applications. Designed with 1-1/4 inch NPT female inlet and 1-1/2 inch expanded outlet connections, this valve manages a massive 3,560,000 BTU/hr discharge capacity. It is factory set at 60 PSI to prevent catastrophic system failure in ASME Section IV high-output boilers. The non-metallic disc-to-metal seating ensures a positive seal while preventing the disc from sticking or freezing to the seat after long periods of inactivity—a common failure point in residential and commercial hydronic systems. The non-mechanical seat alignment and high-temperature water seal keep the stainless steel spring isolated from corrosive flow, maintaining consistent performance under extreme thermal conditions up to 250°F.

• Model: 740-1 1/4-60 (identical to 0383368)
• Inlet Connection: 1-1/4" NPT Female
• Outlet Connection: 1-1/2" NPT Female (Expanded)
• Pressure Set Point: 60 PSI
• Steam Capacity: 3,560,000 BTU/hr
• Maximum Temperature: 250°F (121°C)
• Body Material: Durable Cast Iron Construction

• Fouling Resistance: The seat is positioned above the drain line to ensure sediment remains clear of the seating surface.
• High Discharge Capacity: Expanded outlet design allows for rapid pressure relief in high-volume commercial boiler setups.
• Corrosion Control: Features a high-temperature water seal that protects internal working parts from water contact during discharge.
• ASME Certified: Meets the rigorous standards for the ASME Boiler and Pressure Vessel Code.

What is the difference between Watts 0383368 and the 740-1 1/4-60?
These part numbers refer to the exact same valve; 0383368 is the specific manufacturing ordering code for the 740 series valve with a 1-1/4 inch inlet set at 60 PSI.

Can this valve be used for potable water systems?
No, the Watts 740 series iron body valve is strictly designed for non-potable hot water space heating boilers and should not be used in domestic water applications.

Why is the outlet larger than the inlet?
The 1-1/2" expanded outlet is a specific design feature to accommodate the rapid expansion of steam and water during a relief event, preventing backpressure on the valve seat.

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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.