McDonnell & Miller 340000 Stem, Valve Disc, and Gasket

Engineered for high-performance fluid regulation, the McDonnell & Miller 340000 (Model SA25A-15) is a precision-machined Stem, Valve Disc, and Gasket assembly specifically designed for Series 25A make-up water feeders. In steam and hydronic installations, maintaining a consistent water level in receiver tanks is critical; this replacement valve assembly ensures a positive, soft-seated seal to prevent bypass and maintain water line stability. The SA25A-15 assembly features a robust stem and a durable disc material optimized for the thermal cycling and mechanical stresses typical of commercial boiler rooms. When your boiler water feeder exhibits slow response times or internal leakage, replacing the valve stem assembly is the standard service protocol to restore the mechanical water feeder to its original operational efficiency. As a genuine McDonnell & Miller part, this kit integrates seamlessly with the float-operated mechanism, providing the exact tolerances required for proportional feed action under pressures up to 35 psi.

• Precise Level Control: Restores the proportional feed action essential for stable receiver tank volumes.
• Durable Soft-Seat Seal: Optimized disc material provides a tight shut-off, reducing water waste and preventing tank flooding.
• Direct OEM Compatibility: Engineered specifically for the Series 25A water feeder, ensuring a perfect mechanical fit without field modifications.
• High-Grade Construction: Built to withstand commercial boiler environment conditions and continuous duty cycles.
• Simplified Service: Complete kit includes the stem, disc, and necessary gaskets for a comprehensive valve rebuild during routine maintenance.

• How do I know if my Series 25A needs a new stem and disc assembly? If you notice the water feeder is "weeping" or failing to shut off completely when the float reaches its set point, the valve disc is likely pitted or worn. Replacing the SA25A-15 assembly restores the internal seal.
• Can this assembly be used in other McDonnell & Miller feeder series? This specific internal assembly is designed exclusively for the 25A Series. For other models like the Series 21 or 27, please verify the specific model number to ensure proper float linkage alignment.
• Does this kit include the valve seat? No, this is the SA25A-15 stem and disc assembly. While often replaced together, the valve seat (typically part number 25A-14) is a separate component and should be inspected for scoring when the stem is removed.

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.