The Spence E-1 1/4 Valve is a cast iron pressure reducing valve engineered for high-demand steam, gas, and vapor applications. This 1 1/4-inch E-Main Valve features a normally closed design with packless construction, ensuring frictionless operation and an extended service life in rigorous mechanical rooms. Built with balanced metal diaphragms and a protected main spring, it achieves ANSI/FCI 70-2 Class IV shutoff, effectively preventing seat leakage during the off-cycle. As a versatile pilot-operated regulator, this full port main valve is compatible with various pilots for pressure, temperature, or differential control. Standard NPT connections allow for direct in-line maintenance without disturbing the piping. Whether utilized in steam distribution systems or heat exchanger control, this 1 1/4" NPT pilot operated valve provides the precise fluid and vapor regulation necessary for commercial and industrial HVACR infrastructure. Key Benefits Packless Construction: Eliminates the need for traditional stuffing boxes, reducing friction during operation and minimizing internal wear for long-term reliability. Precise Capacity Control: The full port design ensures maximum flow capacity while the normally closed safety feature prevents unintended downstream flow. Multi-Pilot Compatibility: Easily pairs with pressure, temperature, or electronic pilots to meet specific steam regulation or process control requirements. High-Durability Trim: Features stainless steel seat and disc components to resist erosion and maintain tight shutoff under high-pressure conditions. Common Questions What is the minimum pressure differential required for this valve? This Spence Main Valve typically requires a minimum pressure differential of 10 PSI to ensure the internal diaphragm overcomes the main spring and pilot signal correctly. Can this valve be used for liquid applications? While primary for steam and gas service, the Type E main valve is rated for fluid applications; however, proper trim selection and pilot configuration are required to prevent water hammer or cavitation. How do I prepare this valve for installation in a steam line? Install the valve in a horizontal pipe run and ensure the line is thoroughly cleaned. It is critical to install a strainer upstream and provide adequate trapping of condensate to protect the internal diaphragms and seat. 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.
