not for powering a millivolt thermostat circuit which requires a thermopile

the 4183-00 features a rugged brass body and synthetic seating material to ensure a positive shut-off and minimize seat leakage

Normally Open relay

Concealed Calibration: The internal screwdriver slot range adjuster prevents accidental setpoint shifts in high-traffic commercial areas

providing a strong magnetic pull without excessive energy waste

Spirax-Sarco 55224 Main Valve Refrigerant not for powering a millivoltThe Spirax Sarco 55224 is a 1 inch NPT cast iron main valve engineered for precision high capacity steam regulation in industrial environments. Built as the cornerstone of the Spirax Sarco 25 series, this pilot operated pressure regulator provides exceptional stability and dead end shutoff (ANSI Class IV) across varying upstream pressures. As a seasoned technician knows, the versatility of the 55224 main valve lies in its modularitysimply pair it with