Smith 100274785 Pressure Relief Valve is a critical OEM replacement part engineered for high-capacity commercial boilers and water heating systems

It serves as a direct drop-in replacement for numerous legacy part numbers

The kit contains the integrated furnace control board

Industrial Grade Protection: Features automatic thermal overload protection to prevent winding failure during high-ambient operations

Wide Operating Range: Rated for static pressures up to 400 psig

Siemens Building Technology 331-2906 Actuator 321894-708 Smith 100274785 Pressure Relief ValveThe Siemens Building Technology 331 2906 Actuator is a heavy duty, No. 4 pneumatic damper actuator engineered for precise control in commercial HVAC systems. This piston type actuator features a 5 to 10 psi nominal spring range and a robust 4 inch stroke, making it a reliable solution for modulating or two position control of outdoor air, return air, and exhaust dampers. Designed with a pivot mount configuration, it reduces binding and mechanical