Watts 0121508 Valve

The Watts 0121508 is a heavy-duty, 1-inch LF174A-1-150 safety relief valve specifically designed for high-capacity hot water heating boiler applications. Constructed with a lead-free copper silicon alloy body, this valve ensures compliance with stringent safety standards while providing reliable pressure protection. It features a factory setpoint of 150 psi and a massive steam discharge capacity of 3,795,000 BTU/hr, making it a critical component for large-scale domestic and commercial supply systems. The Watts LF174A series is engineered with a seat located above the drain to prevent sediment accumulation and a non-mechanical seat-to-disc alignment that eliminates sticking or freezing in the field. This 1" NPT female inlet/outlet valve includes a stainless steel spring and a built-in test lever for routine operation checks. It is also compatible with SentryPlus Alert flood sensors, providing an added layer of monitoring for discharge events when integrated with a building management system.

• High Steam Discharge: Rated at 3,795,000 BTU/hr to handle high-output boiler runaway firing.
• Sediment Resistance: Raised seat design ensures water and debris cannot be trapped, preventing foul-ups and seat damage.
• Durable Construction: Features a lead-free bronze body and stainless steel spring for longevity in corrosive water conditions.
• Contractor Friendly: Standard 1-inch FNPT connections allow for direct replacement of older 174A-1-150 or LF174A-150 models.
• System Safety: Automatic reseating and non-mechanical alignment provide consistent performance under emergency relief conditions.

Is the Watts 0121508 suitable for steam boilers?
No, this valve is specifically rated for hot water space heating boilers and domestic supply systems. It is not designed for primary steam boiler applications.

Does this valve come with the flood sensor kit?
The valve is packaged with the SentryPlus Alert sensor, but the connection kit required to relay alerts to a BMS or cellular gateway must be purchased separately.

Can the 150 psi pressure setting be adjusted?
No, this ASME Section XIII valve is factory set and sealed at 150 psi. It should only be used in systems where the maximum working pressure does not exceed this rating.

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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.