Spence E-3-125 Valve

The Spence E-3-125 is a professional-grade pilot-operated main valve engineered for critical steam pressure regulation and temperature control applications in commercial and industrial piping systems. This 3-inch flanged main valve features a robust cast iron body with an ANSI 125# flange rating, designed to handle a maximum inlet pressure of 125 PSIG at temperatures up to 450°F. Built with a normally closed, single-seat design, the Spence Type E utilizes packless construction and balanced metal diaphragms to ensure frictionless travel and high-cycle reliability. This steam control valve is compatible with a wide array of Spence pilots, including the D-series for pressure reduction or T-series for temperature management, allowing for versatile system integration. Its full port design provides maximum flow capacity while maintaining tight ANSI/FCI 70-2 Class IV shutoff. For proper field installation, ensure the diaphragm chamber is positioned downward in a horizontal pipe run with at least 10 diameters of straight pipe upstream.

• Exceptional Durability: The packless construction eliminates traditional packing leaks and minimizes maintenance requirements in high-demand steam loops.
• Precise Regulation: Reliable pilot-operated design ensures stable downstream pressure even with varying inlet conditions.
• Field Serviceable: The inline-accessible single seat and stainless steel trim allow for rapid inspection and component replacement without removing the valve from the piping.
• Universal Compatibility: Modular design supports integration with pressure pilots, temperature pilots, and solenoid overrides for custom control sequences.

What is the minimum pressure differential required for the Spence E-3-125 to operate?
This main valve typically requires a minimum differential pressure of 10-15 PSI across the seat to ensure the diaphragm can overcome the spring force and fully stroke the valve.

Can this valve be used for liquid service?
While primarily used for steam service, the Type E is rated for fluid, gas, and vapor applications; however, for liquid service, ensure your pilot selection and bypass configuration prevent water hammer.

Why is my Spence main valve failing to open?
The most common culprits for performance issues are a clogged 4A bleedport or a blocked 5A restriction elbow. Technicians should verify these orifices are clear and that the control pipe is pitched away from the pilot to prevent condensate trapping.

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.