Watts 0274426 Valve
The Watts 0274426 (Series 174A) is a heavy-duty 3/4" bronze boiler pressure relief valve engineered specifically for high-capacity protection in hot water heating systems and domestic supply boilers. Rated for a 33 PSI set pressure with a massive steam discharge capacity of 695,000 BTU/hr, this valve is a critical safety component designed to prevent catastrophic over-pressurization. It features a rugged bronze body and a stainless steel spring for long-term durability in demanding hydronic environments. The internal non-metallic disc-to-metal seating is specifically formulated to resist corrosive water conditions, preventing the "sticking and freezing" typical of inferior valves. Designed with the professional contractor in mind, the FNPT threaded inlet and outlet connections ensure a secure, leak-free fit during installation. Unlike standard residential valves, the 174A series utilizes a high-temperature water seal to isolate internal working parts from system fluid, ensuring the ASME Section IV rated protection remains reliable throughout the valve's service life.
Key Benefits for the Technician- High BTU Rating: Capacity of 695,000 BTU/hr makes it suitable for larger residential and light commercial hot water boiler systems.
- Corrosion Resistance: The bronze construction and non-stick disc design prevent sediment buildup from fouling the seat.
- Maintenance Ready: Equipped with a standard test lever to verify emergency safety relief functionality during annual inspections.
- Reliable Alignment: Non-mechanical seat-to-disc alignment ensures the valve reseals properly after a pressure event.
Is the Watts 0274426 suitable for steam boilers?
No. This specific valve is designed for hot water heating and domestic supply boilers. For steam applications, you must use a valve specifically rated for steam service with the appropriate ASME section stamp.
What is the maximum operating temperature for this relief valve?
The Watts 174A-033 is rated for a maximum temperature of 250°F (121°C). Exceeding this temperature can damage the non-metallic disc and compromise the pressure seal.
Can I install this valve horizontally?
For optimal performance and to meet most local codes, the valve should be installed with the stem in a vertical upright position. This prevents sediment from settling on the seat and ensures the 3/4" NPT discharge remains clear.
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.
Original: $383.31
-65%$383.31
$134.16Watts 0274426 Valve
The Watts 0274426 (Series 174A) is a heavy-duty 3/4" bronze boiler pressure relief valve engineered specifically for high-capacity protection in hot water heating systems and domestic supply boilers. Rated for a 33 PSI set pressure with a massive steam discharge capacity of 695,000 BTU/hr, this valve is a critical safety component designed to prevent catastrophic over-pressurization. It features a rugged bronze body and a stainless steel spring for long-term durability in demanding hydronic environments. The internal non-metallic disc-to-metal seating is specifically formulated to resist corrosive water conditions, preventing the "sticking and freezing" typical of inferior valves. Designed with the professional contractor in mind, the FNPT threaded inlet and outlet connections ensure a secure, leak-free fit during installation. Unlike standard residential valves, the 174A series utilizes a high-temperature water seal to isolate internal working parts from system fluid, ensuring the ASME Section IV rated protection remains reliable throughout the valve's service life.
Key Benefits for the Technician- High BTU Rating: Capacity of 695,000 BTU/hr makes it suitable for larger residential and light commercial hot water boiler systems.
- Corrosion Resistance: The bronze construction and non-stick disc design prevent sediment buildup from fouling the seat.
- Maintenance Ready: Equipped with a standard test lever to verify emergency safety relief functionality during annual inspections.
- Reliable Alignment: Non-mechanical seat-to-disc alignment ensures the valve reseals properly after a pressure event.
Is the Watts 0274426 suitable for steam boilers?
No. This specific valve is designed for hot water heating and domestic supply boilers. For steam applications, you must use a valve specifically rated for steam service with the appropriate ASME section stamp.
What is the maximum operating temperature for this relief valve?
The Watts 174A-033 is rated for a maximum temperature of 250°F (121°C). Exceeding this temperature can damage the non-metallic disc and compromise the pressure seal.
Can I install this valve horizontally?
For optimal performance and to meet most local codes, the valve should be installed with the stem in a vertical upright position. This prevents sediment from settling on the seat and ensures the 3/4" NPT discharge remains clear.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Watts 0274426 (Series 174A) is a heavy-duty 3/4" bronze boiler pressure relief valve engineered specifically for high-capacity protection in hot water heating systems and domestic supply boilers. Rated for a 33 PSI set pressure with a massive steam discharge capacity of 695,000 BTU/hr, this valve is a critical safety component designed to prevent catastrophic over-pressurization. It features a rugged bronze body and a stainless steel spring for long-term durability in demanding hydronic environments. The internal non-metallic disc-to-metal seating is specifically formulated to resist corrosive water conditions, preventing the "sticking and freezing" typical of inferior valves. Designed with the professional contractor in mind, the FNPT threaded inlet and outlet connections ensure a secure, leak-free fit during installation. Unlike standard residential valves, the 174A series utilizes a high-temperature water seal to isolate internal working parts from system fluid, ensuring the ASME Section IV rated protection remains reliable throughout the valve's service life.
Key Benefits for the Technician- High BTU Rating: Capacity of 695,000 BTU/hr makes it suitable for larger residential and light commercial hot water boiler systems.
- Corrosion Resistance: The bronze construction and non-stick disc design prevent sediment buildup from fouling the seat.
- Maintenance Ready: Equipped with a standard test lever to verify emergency safety relief functionality during annual inspections.
- Reliable Alignment: Non-mechanical seat-to-disc alignment ensures the valve reseals properly after a pressure event.
Is the Watts 0274426 suitable for steam boilers?
No. This specific valve is designed for hot water heating and domestic supply boilers. For steam applications, you must use a valve specifically rated for steam service with the appropriate ASME section stamp.
What is the maximum operating temperature for this relief valve?
The Watts 174A-033 is rated for a maximum temperature of 250°F (121°C). Exceeding this temperature can damage the non-metallic disc and compromise the pressure seal.
Can I install this valve horizontally?
For optimal performance and to meet most local codes, the valve should be installed with the stem in a vertical upright position. This prevents sediment from settling on the seat and ensures the 3/4" NPT discharge remains clear.
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.
