The Spence Engineering D320 Pilot is a cast iron, spring-actuated pressure reducing pilot designed for precise steam pressure regulation in industrial boiler systems. Engineered to work in tandem with a Spence Main Valve (such as the Type E or Type C), this pressure pilot valve handles a delivery range of 3 to 20 PSI, making it ideal for low-pressure steam heating and process applications. The D-Pilot 3-20# Spring Rg CI features a rugged construction that withstands high-temperature service while maintaining accurate setpoint stability. Contractors rely on the Spence D-Pilot for its ability to throttle the main valve efficiently, responding instantly to downstream load changes. This hardware ensures consistent steam system performance by preventing pressure fluctuations that can damage downstream equipment. When replacing a Spence D320, verify the diaphragm material and spring color to ensure exact field compatibility for HVAC pressure control applications. Key Benefits Cast Iron Durability: Robust housing designed for long-term service in demanding mechanical rooms. Precise Throttling: Provides stable control over a 3 to 20 PSI range, preventing hunting in steam lines. Interchangeable Design: Standardized mounting allow for seamless replacement on existing Spence Type E or C main valve bodies. Reduced Maintenance: Simple internal architecture allows for rapid cleaning and diaphragm replacement without removing the pilot from the line. Common Questions How do I adjust the delivery pressure on a Spence D320? Increase the delivery pressure by turning the adjustment screw clockwise to compress the 3-20# spring. Always use a calibrated gauge downstream to verify the setpoint during commissioning. Can the D320 pilot be used for water service? While primarily designed for steam, the Spence D series can be configured for other fluids; however, you must verify that the diaphragm material and internal trim are compatible with the specific medium and temperature. What causes a D-Pilot to fail to close? Failure to close is typically caused by debris trapped in the pilot seat or a ruptured diaphragm. Ensure an upstream strainer is installed to protect the pilot orifice from pipe scale and slag. This item is not eligible for free shipping. 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.
