By utilizing patented Envirascan technology

suitable for most residential and light commercial pool heating loads

ensuring the latest metallurgy and balance standards

Enhanced Starting Reliability: The HST (High Starting Torque) design prevents stalls during heavy-duty cycles in high-ambient conditions

Designed for zero differential pressure systems

Spence E-1 Valve Refrigerant By utilizing patented Envirascan technologyFor steam, air, and vapor systems, the Spence E 1 1" Main Valve serves as the reliable industry standard for rugged pilot operated pressure regulation. This 1 inch cast iron valve is designed for high performance service in HVACR and industrial steam plants, offering a normally closed, single seat configuration that ensures ANSI FCI 70 2 Class IV shutoff. The packless construction utilizes balanced metal diaphragms and a protected main spring to