55225 Spirax Sarco Regulator
$1,948.60
1-1/4 in. 25 NPT Regulator CAST IRON
Overview of 55225 Spirax Sarco Regulator
The Spirax Sarco 55225 is part of Spirax’s 25P pilot-operated pressure reducing main valve family. This 1-¼” NPT, cast iron regulator is designed for steam pressure reduction, offering precise control, dead-end shutoff, and reliable performance in commercial and industrial steam systems.
It uses downstream sensing feedback through a pilot to adjust the main valve opening to maintain the desired set pressure. The 55225 model can handle steam pressures up to 250 psi and temperatures up to 450 °F.
Features
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Pilot-operated main valve for accurate steam pressure regulation
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Self-acting diaphragm mechanism with external feedback sensing
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Dead-end shutoff capability meeting ANSI/FCI 70-2 Class IV standards
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Cast iron body construction with stainless steel trim
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Uses color-coded pilot springs for ease of setpoint selection
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Interchangeable spring modules for various pressure ranges
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Horizontal installation recommended for best performance
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Wash-through design to reduce debris retention
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Designed for steam service with proven durability
Specifications
| Specification | Details |
|---|---|
| Model / Series | 55225 (25P Series) |
| Nominal Size | 1-¼” NPT |
| Body Material | Cast Iron |
| Maximum Pressure (Steam) | 250 psi |
| Maximum Temperature | 450 °F |
| End Connections | FNPT (female NPT) |
| Shutoff Rating | ANSI/FCI 70-2 Class IV dead-end shutoff |
| Control Type | Pilot-operated with feedback sensing |
| Sensing Line | External downstream sensing |
| Internal Trim | Stainless steel (valve seat and disc) |
| Mounting Orientation | Horizontal recommended |
| Spring Range Options | Multiple color-coded ranges (e.g. 3-30 psi, 20-100 psi, 80-250 psi) |
| Service Media | Saturated steam |
| Typical Applications | Main steam pressure reduction, protecting downstream equipment, boiler control systems |
Applications
The 55225 Spirax Sarco regulator is suited for a wide range of steam pressure control applications, including:
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Main steam line pressure reduction
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Feedwater pump steam control
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Steam to conform to process equipment inlet pressure requirements
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Steam regulation for heat exchangers or control valves
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Industrial boiler downstream protection
Its pilot-operated design enables stable regulation even under varying load conditions.
Benefits
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Precise pressure regulation with stable control dynamics
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Strong shutoff performance to prevent overpressure
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Modular pilot spring system for easy reconfiguration
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Built for durability in steam service conditions
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Support for a broad operating range (pressure and temperature)
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Maintenance and service ease with standard internal parts
| Weight | 42 lbs |
|---|---|
| Dimensions | 15 × 14 × 12 in |
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