Spence E-2 1/2-125 Valve

The Spence E-2 1/2-125 is a pilot-operated, normally closed steam pressure reducing valve designed for heavy-duty HVAC and industrial process applications. Featuring a 2-1/2" 125# flanged cast iron body, this E-Main valve utilizes a single-seat, packless construction with balanced metal diaphragms to provide a Class IV shutoff. Ideal for systems requiring precise steam pressure regulation, it thrives in environments where minimizing friction and stem wear is critical for long-term reliability. The Spence Type E series is a staple for contractors due to its modular design, allowing it to be paired with a wide range of Spence pilots—such as the Type D for pressure control or Type T for temperature regulation—providing unmatched versatility in the field.

Key Benefits

• High-Capacity Performance: The full port design ensures maximum flow rates with a high Cv rating, making it suitable for large-scale heat exchangers and air handling coils.
• Rugged Durability: Constructed from cast iron with stainless steel trim to withstand up to 125 PSIG at 406°F.
• Reduced Maintenance: The packless construction eliminates the need for stem packing adjustments, significantly reducing the risk of external leaks.
• Operational Accuracy: Balanced metal diaphragms provide frictionless movement for stable delivery pressure even under varying inlet conditions.

Common Questions

What is the minimum pressure differential for the Spence E-Main?
For optimal operation of the pilot-operated valve, a minimum differential of 3 to 5 PSI between the inlet and outlet is typically required to ensure the main valve opens fully.

Can this valve handle temperature control?
Yes, when paired with a temperature pilot (like the T10 or T14), the Spence E-2 1/2-125 serves as an effective 2-1/2 inch temperature regulating valve for storage heaters and converters.

What is the best orientation for installation?
Install the valve in a horizontal pipe run with the diaphragm chamber pointing down and the flow arrow aligned correctly to maintain proper drainage and prevent scale buildup.

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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.