How do I size this valve for a boiler replacement

this main burner assembly is designed with a dedicated pressure tap to allow technicians to verify manifold pressure and ensure optimal gas-to-air ratios during commissioning or routine maintenance

and irregular flame patterns

effectively restoring the integrity of the packing box assembly

Spirax-Sarco 55223 Main Valve Refrigerant How do I size thisThe 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 450F. The diaphragm operated design eliminates the