McDonnell & Miller 250-3/4-45 Valve
The McDonnell & Miller 250-3/4-45 Pressure Relief Valve is a high-capacity safety control engineered for hydronic heating systems and storage tanks. Featuring a 3/4" NPT threaded connection, this valve is factory-set at 45 PSI to ensure reliable over-pressure protection in demanding HVACR applications. Since it is designed with a durable bronze body and seat, it maintains structural integrity under high temperatures, up to a maximum of 250°F (121°C). With a substantial 1,065,000 BTU capacity, the 250-3/4-45 effectively minimizes water hammer caused by flash steam through a low-differential 3 PSI operation. This model, known by technical part number 181425, serves as the direct replacement for 0274496 and is built to meet ASME Section IV Pressure Vessel and Boiler Code standards. Professional contractors utilize this unit for its precise EPDM rubber diaphragm and seat disc, which provide a tight seal and consistent performance across its 30 to 125 PSIG operating range.
Key Benefits:
- High BTU Rating: Rated for up to 1,065,000 BTU, making it suitable for larger commercial and residential hydronic boilers.
- ASME Certified: Manufactured in compliance with ASME Section IV standards for safety and reliability in pressure relief applications.
- Durable Construction: The bronze body and EPDM seat disc offer superior corrosion resistance and longevity in hot water systems.
- Direct Compatibility: Seamlessly replaces legacy part number 0274496, reducing downtime during field service and retrofits.
- Optimized Pressure Control: A tight 3 PSI differential between opening and closing helps prevent system oscillations and excessive fluid loss.
Common Questions:
Can the 250-3/4-45 be mounted in any orientation?
According to technical guidelines, the Series 250 safety relief valves should typically be mounted in an upright position. While some low-pressure models allow for variation, ensuring the discharge piping flows downward by gravity is essential to prevent sediment buildup on the seat disc.
Is this valve suitable for steam boiler applications?
No, the McDonnell & Miller 181425 is specifically designed for hydronic heating systems and hot water storage tanks. For steam applications, a valve rated for steam service and calibrated in pounds per hour (lb/hr) must be used.
How do I verify if this replaces my current 0274496 valve?
The 250-3/4-45 is the designated manufacturer replacement for 0274496. Ensure your system requirements match the 45 PSI set point and the 3/4" NPT connection size 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.
Original: $283.91
-65%$283.91
$99.37McDonnell & Miller 250-3/4-45 Valve
The McDonnell & Miller 250-3/4-45 Pressure Relief Valve is a high-capacity safety control engineered for hydronic heating systems and storage tanks. Featuring a 3/4" NPT threaded connection, this valve is factory-set at 45 PSI to ensure reliable over-pressure protection in demanding HVACR applications. Since it is designed with a durable bronze body and seat, it maintains structural integrity under high temperatures, up to a maximum of 250°F (121°C). With a substantial 1,065,000 BTU capacity, the 250-3/4-45 effectively minimizes water hammer caused by flash steam through a low-differential 3 PSI operation. This model, known by technical part number 181425, serves as the direct replacement for 0274496 and is built to meet ASME Section IV Pressure Vessel and Boiler Code standards. Professional contractors utilize this unit for its precise EPDM rubber diaphragm and seat disc, which provide a tight seal and consistent performance across its 30 to 125 PSIG operating range.
Key Benefits:
- High BTU Rating: Rated for up to 1,065,000 BTU, making it suitable for larger commercial and residential hydronic boilers.
- ASME Certified: Manufactured in compliance with ASME Section IV standards for safety and reliability in pressure relief applications.
- Durable Construction: The bronze body and EPDM seat disc offer superior corrosion resistance and longevity in hot water systems.
- Direct Compatibility: Seamlessly replaces legacy part number 0274496, reducing downtime during field service and retrofits.
- Optimized Pressure Control: A tight 3 PSI differential between opening and closing helps prevent system oscillations and excessive fluid loss.
Common Questions:
Can the 250-3/4-45 be mounted in any orientation?
According to technical guidelines, the Series 250 safety relief valves should typically be mounted in an upright position. While some low-pressure models allow for variation, ensuring the discharge piping flows downward by gravity is essential to prevent sediment buildup on the seat disc.
Is this valve suitable for steam boiler applications?
No, the McDonnell & Miller 181425 is specifically designed for hydronic heating systems and hot water storage tanks. For steam applications, a valve rated for steam service and calibrated in pounds per hour (lb/hr) must be used.
How do I verify if this replaces my current 0274496 valve?
The 250-3/4-45 is the designated manufacturer replacement for 0274496. Ensure your system requirements match the 45 PSI set point and the 3/4" NPT connection size 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.
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Description
The McDonnell & Miller 250-3/4-45 Pressure Relief Valve is a high-capacity safety control engineered for hydronic heating systems and storage tanks. Featuring a 3/4" NPT threaded connection, this valve is factory-set at 45 PSI to ensure reliable over-pressure protection in demanding HVACR applications. Since it is designed with a durable bronze body and seat, it maintains structural integrity under high temperatures, up to a maximum of 250°F (121°C). With a substantial 1,065,000 BTU capacity, the 250-3/4-45 effectively minimizes water hammer caused by flash steam through a low-differential 3 PSI operation. This model, known by technical part number 181425, serves as the direct replacement for 0274496 and is built to meet ASME Section IV Pressure Vessel and Boiler Code standards. Professional contractors utilize this unit for its precise EPDM rubber diaphragm and seat disc, which provide a tight seal and consistent performance across its 30 to 125 PSIG operating range.
Key Benefits:
- High BTU Rating: Rated for up to 1,065,000 BTU, making it suitable for larger commercial and residential hydronic boilers.
- ASME Certified: Manufactured in compliance with ASME Section IV standards for safety and reliability in pressure relief applications.
- Durable Construction: The bronze body and EPDM seat disc offer superior corrosion resistance and longevity in hot water systems.
- Direct Compatibility: Seamlessly replaces legacy part number 0274496, reducing downtime during field service and retrofits.
- Optimized Pressure Control: A tight 3 PSI differential between opening and closing helps prevent system oscillations and excessive fluid loss.
Common Questions:
Can the 250-3/4-45 be mounted in any orientation?
According to technical guidelines, the Series 250 safety relief valves should typically be mounted in an upright position. While some low-pressure models allow for variation, ensuring the discharge piping flows downward by gravity is essential to prevent sediment buildup on the seat disc.
Is this valve suitable for steam boiler applications?
No, the McDonnell & Miller 181425 is specifically designed for hydronic heating systems and hot water storage tanks. For steam applications, a valve rated for steam service and calibrated in pounds per hour (lb/hr) must be used.
How do I verify if this replaces my current 0274496 valve?
The 250-3/4-45 is the designated manufacturer replacement for 0274496. Ensure your system requirements match the 45 PSI set point and the 3/4" NPT connection size 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.
