Watts 0358553 Valve

The Watts 0358553 (Model 374A-3/4-30) is a high-capacity boiler pressure relief valve engineered specifically for hot water space heating boilers. This critical safety component provides overpressure protection with a fixed 30 psi pressure relief setting and a discharge capacity of 550,000 BTU/hr. Designed for professional hydronic heating systems, it features a durable iron body construction and a forged bronze inlet to withstand demanding contractor environments.

For veteran technicians, the Watts 374A series is the standard for reliability due to its non-mechanical disc-to-seat alignment, which prevents the valve from sticking or freezing even after long periods of inactivity. The raised seat design is a key technical advantage, positioned above the drain to ensure sediment and water cannot be trapped, effectively eliminating seat fouling. It includes a 3/4 inch female NPT inlet and outlet, and is equipped with a SentryPlus Alert flood sensor for integration with building management systems to detect discharge events early.

• Pressure Protection: Fixed 30 psi set point protects against excessive system pressure.
• Debris Resistance: Raised seat architecture prevents sediment buildup and clogging.
• High Thermal Capacity: Rated for systems up to 550,000 BTU/hr and temperatures reaching 250°F.
• System Integration: Features an inclusive flood sensor for remote monitoring of relief events.
• Material Integrity: Rugged cast iron body with corrosion-resistant bronze internal components.

What is the relief capacity of the Watts 0358553?
This valve is ASME rated for a steam discharge capacity of 550,000 BTU per hour at its 30 psi set point.

Can the Watts 374A-3/4-30 be installed in any orientation?
According to ASME Section IV, the spindle should be installed in a vertical orientation to ensure proper mechanical operation and drainage.

Is the 0358553 compatible with older Watts models?
Yes, this part number is identical to and serves as a direct replacement for models 358553 and standard 374A-3/4-30 valves.

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.