Description
The Spence Engineering D550 is a D-Pilot series pressure regulating valve designed for dependable, accurate pressure control in steam and hydronic piping systems. Built with a durable cast iron body, this pilot-operated regulator delivers consistent downstream pressure management across a 5–50 PSI spring range, making it well-suited for a broad range of commercial and industrial HVAC and process applications.
Key Features
- Pilot-operated D-Pilot design for precise, stable downstream pressure regulation
- Spring range: 5–50 PSI, accommodating a wide variety of system pressure requirements
- Cast iron (CI) body construction for strength and long service life
- Suitable for steam and hydronic system applications
- Engineered by Spence Engineering, a trusted name in pressure and temperature control
Application
The D550 is ideal for commercial and industrial HVAC systems requiring reliable pressure reduction and control. Its pilot-operated mechanism ensures accurate set-point maintenance even under varying load conditions, reducing energy waste and protecting downstream equipment.
Why Choose Spence Engineering
Spence Engineering has a long-standing reputation for manufacturing high-quality pressure regulators, temperature regulators, and control valves for steam and fluid systems. The D-Pilot series exemplifies their commitment to precision engineering and durable construction.







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