The Spence Engineering D20150 Pilot is a heavy-duty, spring-operated pressure reducing pilot designed for precise steam pressure regulation when paired with a Type E or Type C main valve. This cast iron pilot features a 20-150 PSI spring range (designated by the black spring), making it a standard choice for high-demand industrial and commercial heating systems. Built with a normally closed, packless construction, the D20150 ensures accurate pressure control within +/- 1 PSI, maintaining stable delivery pressures despite fluctuations in the initial supply. Engineered for durability in harsh environments, this unit handles a maximum inlet pressure of 250 PSIG and operating temperatures up to 450°F. The D-Pilot 20-150# Spring Rg CI is essentially the "brain" of your regulator setup, utilizing a stainless steel diaphragm and stem to provide long-term reliability without the friction issues common in packed designs. For contractors, the straight-through 1/4 inch NPT connections and easy in-line maintenance capabilities minimize downtime during routine inspections or spring swaps. Key Benefits Precise Throttling: Controls delivery pressures within a tight +/- 1 PSI margin for critical steam distribution. Rugged Construction: Cast iron body with stainless steel internals offers superior resistance to pipeline debris and erosion. Versatile Compatibility: Mounts on either side of the Spence Type E main valve using standard 1/4 inch nipples and unions. Packless Design: Eliminates the need for traditional stem packing, significantly reducing leakage points and maintenance requirements. Common Questions What main valves are compatible with the D20150? This pressure pilot is specifically designed for use with Spence Type E or Type C main valves to create a complete pilot-operated regulator assembly. Can I change the pressure range later? Yes, by replacing the adjusting spring, you can modify the pressure range of the pilot assembly. The D20150 uses the black spring for the 20-150 PSI range. Does this pilot require a bleed port? Proper operation requires a 4A bleedport fitting installed in the outlet of the main valve body to ensure the regulator steadies the flow and closes correctly. 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.
