Watts 0360281 Valve

The Watts 0360281 Valve (Series M375-M1) is an essential safety component for contractors managing hot water heating and domestic supply boiler systems. This 3/4" boiler pressure relief valve is engineered to protect equipment from catastrophic failure caused by excessive thermal expansion or mechanical malfunction. Featuring a durable brass body construction and a high-strength stainless steel spring, it is factory set to a 75 PSI relief pressure. The unit utilizes a non-metallic disc-to-metal seating arrangement that prevents the internal components from sticking or freezing, even in systems where water and sediment might typically compromise seal integrity. With a robust discharge capacity of 738,000 BTU/hr, this valve ensures rapid pressure equalization during emergency events. Designed specifically for non-potable water applications, the M375-M1 3/4" 75# relief valve employs an NPT threaded male inlet and an NPT threaded female outlet for a secure, leak-free connection. This spring loaded valve provides automatic reseating after pressure reaches safe levels, maintaining system uptime and protecting sensitive HVACR infrastructure.

• Ensures high-capacity pressure protection with a 738,000 BTU/hr rating suited for commercial and residential boilers.
• Features a corrosion-resistant brass body and stainless steel spring for longevity in demanding hydronic environments.
• Minimizes maintenance downtime through automatic reseating and a soft-seated design that prevents sediment buildup.
• Protects against "sticking" via high-quality internal materials, ensuring the valve activates precisely at 75 PSI.
• Facilitates straightforward installation with standard 3/4 in. NPT connections compatible with most boiler headers.

Is the Watts 0360281 suitable for drinking water systems?
No, this specific model is a non-lead-free safety relief valve. It is designed exclusively for use in hot water heating and domestic supply boiler applications where the water is not intended for human consumption.

What is the primary function of the test lever on the M375-M1?
The test lever allows technicians to manually lift the disc off the seat to verify the waterway is clear and the spring mechanism is functional during routine system inspections.

Can this valve be used as an operating control to regulate system pressure?
This is an emergency pressure relief valve only. It should never be used as a primary system regulator or operating control; it is strictly intended to prevent over-pressurization during a secondary failure.

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.