Spence D50-3/4-3/15 Regulator

The Spence D50-3/4-3/15 is a self-contained, direct-acting pressure reducing valve designed for reliable service in steam, air, and non-corrosive gas applications. Featuring a 3/4 inch NPT connection, this compact pressure regulator is equipped with a 3-15 PSI spring range, making it ideal for low-pressure steam heating systems and industrial process control where precise downstream regulation is required. This model utilizes a stainless steel diaphragm and a heavy-duty cast iron body to withstand high-velocity steam flows while maintaining setpoint stability. As a normally open regulator, it provides immediate response to pressure fluctuations without the need for external sensing lines or pilots. For contractors performing steam system maintenance, the D50 is a preferred choice due to its single-seat design which ensures tight shut-off and prevents pressure creep during dead-end service. Whether you are managing commercial boiler feed lines or process steam regulation, this valve's rugged construction minimizes maintenance intervals in demanding mechanical rooms.

• Precise Pressure Control: The 3-15 PSI spring allows for fine-tuned adjustment in low-pressure steam and air distribution systems.
• Durable Construction: Features a high-strength cast iron body and stainless steel internals for superior erosion resistance.
• Direct-Acting Design: Operates without the need for external pilots, simplifying installation in tight mechanical footprints.
• Tight Shut-Off: Engineered with a single-seated orifice to prevent downstream pressure buildup during periods of low demand.
• High Temperature Rating: Specifically built to handle the thermal stresses common in saturated steam applications.

Commonly Asked Questions

What is the maximum inlet pressure for the Spence D50?
The D50 series is typically rated for a maximum inlet pressure of 300 PSIG at 450°F, though actual limits depend on the specific body material and orifice size. Always verify your system's peak operating conditions against the valve's nameplate.

Can the 3-15# spring be swapped for a different range?
Yes, the spring is interchangeable. If your application requirements change, you can install a different color-coded Spence spring to accommodate higher or lower delivery pressures without replacing the entire valve body.

Does this regulator require an external sensing line?
No, the Spence D50 is a direct-acting regulator. It senses downstream pressure internally under the diaphragm, eliminating the need for a separate 1/4 inch sensing pipe, which reduces potential leak points in the system.

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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.