Weil McLain 383-500-275 Valve

For service technicians maintaining high-efficiency hydronic systems, the Weil McLain 383-500-275 Pressure/Temperature Gauge Check Valve is the standard specification for the Ultra Gas Boiler series, including Ultra-80, 105, and 230 models. Built as a 1/2 inch NPT threaded component, this P/T gauge check valve serves a dual purpose: it provides a secure connection point for system monitoring while acting as a reliable backflow preventer. Its integration within the boiler piping system ensures that sensors can accurately track hydronic heating fluctuations without compromising fluid direction or pressure stability. Replacing a fouled or leaking check valve is critical for preventing boiler pressure drops and ensuring consistent data to the control module. This OEM part features a rugged body designed to withstand the thermal stressors typical of commercial and residential heat exchangers. By maintaining a one-way flow mechanism, it protects sensitive diagnostic tools and ensures the safety of the secondary loop.

Key Benefits:

• Ensures accurate boiler pressure sensor readings for optimal system modulation.
• Features a durable 1/2 inch NPT thread for leak-free integration with Weil McLain Ultra series boilers.
• Integrated backflow prevention protects external gauges and maintains system directionality.
• Engineered to handle high-temperature hydronic environments without internal seal degradation.
• Facilitates seamless boiler maintenance by allowing gauge inspection without full system drainage.

Common Questions:

Which boiler models are compatible with this check valve?
This part is specifically engineered for the Weil McLain Ultra Gas Boiler line, including the Ultra 80, 105, 155, 230, and Ultra Commercial models. It is frequently utilized in the heat exchanger piping assembly.

How do I troubleshoot a failing P/T check valve?
If you notice erratic gauge readings or water weeping from the gauge connection point, the internal check mechanism or the NPT seating may be compromised. Replacing the 383-500-275 ensures the pressure sensor line remains isolated and accurate.

Can this valve be used with other hydronic components?
While designed for Weil McLain systems, its standard 1/2” NPT scaling allows for installation in various hydronic heating loops requiring a pressure/temperature sensing port with backflow protection.

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.