Spirax-Sarco 55227 Main Valve

The Spirax-Sarco 55227 is a 2-inch NPT 25 Series main valve designed for high-performance steam pressure and temperature regulation. This pilot-operated steam pressure reducing valve (PRV) features a durable cast iron body and stainless steel internals to resist corrosion and wire-drawing in demanding industrial environments. As a self-actuated unit, it utilizes downstream pressure feedback through an external sensing line to provide accurate, stable control regardless of upstream fluctuations. This pilot-operated regulator is compatible with 25P, 25T, and 25PT pilots, allowing for versatile configuration as a pressure, temperature, or combination valve. The diaphragm-actuated design eliminates piston friction, ensuring a long service life and ANSI/FCI 70-2 Class IV shut-off for dead-end service. Whether managing heat exchangers or main line steam distribution, this 25 series valve provides the reliability required for critical HVACR and process steam applications.

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• Versatile Control: Compatible with multiple 25 series pilots for pressure, temperature, or air-actuated electric control.
• Enhanced Durability: Fatigue-tested stainless steel diaphragms and a patented self-scrubbing guide reduce maintenance intervals.
• Tight Shut-off: Achieves Class IV shut-off, preventing downstream pressure creep during no-load conditions.
• Technical Specifications: Rated for a maximum operating pressure of 250 psig and temperatures up to 450°F.
• Field Serviceable: Interchangeable springs and pilots allow for range adjustments without breaking the main steam line.

Is the pilot assembly included with the 55227 main valve?
No, this is the main valve only. You must select and install the appropriate pressure (25P) or temperature (25T) pilot and tubing kit based on your specific application requirements.

What is the proper installation orientation for this 25 series valve?
For optimal performance and to prevent condensate accumulation, the valve should be installed in a horizontal pipeline with the diaphragm case protected by a steam trap installed upstream.

Can I change the downstream pressure range after installation?
Yes. By swapping the color-coded springs within the pilot assembly, you can adjust the delivery pressure range without replacing the entire 2-inch NPT main valve body.

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.