Spence E-4-250 Valve

The Spence E-4-250 is a heavy-duty 4 inch 250# flanged E-Main valve engineered for precise steam pressure regulation in large-scale industrial and district heating systems. Constructed from rugged cast iron (CI), this pilot-operated, normally closed valve features a single-seat design and packless construction, effectively eliminating stem leakage and maintenance issues common in traditional packed valves. Designed for high-performance fluid control, it utilizes balanced metal diaphragms and a protected main spring to ensure stable operation even in volatile high-pressure environments. With a Max Pressure rating of 250 psi WSP at 406°F and a high flow coefficient (Cv) of 109.0, this main valve delivers reliable ANSI/FCI 70-2 Class IV shutoff performance. Its frictionless internal design significantly extends service life, making it a staple for contractors managing critical HVACR steam systems where durability and exact pressure reduction are non-negotiable.

• Frictionless Operation: The packless design and balanced metal diaphragms reduce internal wear, ensuring long-term reliability without frequent re-packing.
• High Flow Capacity: A full-port design provides maximum throughput, minimizing pressure drop across the 4 inch flanged connection.
• Versatile Pilot Pairing: Compatible with a wide range of Spence pilots to handle pressure, temperature, or electronic control requirements.
• Simplified Maintenance: Designed for easy in-line servicing, allowing for diaphragm or spring replacement without removing the 245 lb valve body from the header.

What is the minimum pressure required for this valve to operate?
The Spence E-Main valve typically requires a minimum inlet pressure of 15 PSI and a minimum differential pressure of 10 PSI to ensure the diaphragms actuate the main seat properly.

Can this valve be used for applications other than steam?
Yes, while optimized for steam, the cast iron E-4-250 is suitable for air and non-corrosive gas applications, provided the media is compatible with the trim and diaphragm materials.

Is this a normally open or normally closed valve?
This is a normally closed valve. It requires pilot pressure to open, providing a failsafe shutdown of the steam line if pilot signal or pressure is lost.

This item must ship via truck. Please contact us for freight quote.

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.