Spirax-Sarco 55223 Main Valve

The Spirax-Sarco 55223 is an industrial-grade, 3/4" NPT cast iron main valve engineered for high-performance steam applications. Specifically designed as part of the 25-Series, this component is functionally identical to the 25P-3/4 pilot-operated pressure reducing valve. It features a robust ASTM A126 CL B body capable of handling saturated steam at pressures up to 250 psi and temperatures reaching 450°F. The diaphragm-operated design eliminates the friction associated with piston-style valves, ensuring consistent, dead-end shutoff and superior accuracy in steam pressure regulation. Contractors rely on this pilot-operated main valve for its versatility, as it can be easily configured with various pilots (25P, 25T, or 25PT) to manage pressure, temperature, or combined requirements without breaking the steam line. The stainless steel internals provide maximum durability against wire-drawing and corrosion, while the self-scrubbing guide prevents debris buildup in the valve seat region.

• Modular Flexibility: Compatible with interchangeable pressure, temperature, and electric pilots to meet specific plant standards.
• Precise Control: Maintains steady downstream pressure +/- 1 psi regardless of fluctuations in the high-pressure supply.
• Superior Shutoff: Engineered for ANSI/FCI 70-2 Class IV tight shutoff, preventing pressure creep during periods of zero demand.
• Rugged Construction: Features a fatigue-tested diaphragm and stainless steel trim for extended service life in harsh environments.
• Ease of Maintenance: Internal components are accessible without removing the body from the horizontal piping.

• Is the pilot included with the 55223? No, this part is the main valve only. Pilots must be selected and purchased separately based on your required pressure range or temperature setpoint.
• Can I convert this to a temperature regulator? Yes. By installing a 25T pilot on this 25-Series main valve, you can transition the setup for accurate temperature control in heat exchangers and tanks.
• What size sensing line is required? For stable operation, a 1/8" or 1/4" NPT sensing line should be connected at least 10 pipe diameters downstream from the valve.

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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.