As a high-performance rolling diaphragm

This heavy-duty thermal expansion valve power element

it regulates blower motor speed timing and flame sensing current to ensure stable furnace operation throughout the heating season

maintaining the stability of thermostats and relay coils across demanding duty cycles

compatible with most boiler tapping points

Johnson Controls MP823E001 Actuator Els PW 17895 As a high-performance rolling diaphragmThe Johnson Controls MP823E001 Actuator is a field proven pneumatic valve actuator specifically engineered for the precise positioning of chilled water, hot water, and steam control valves. Built with a 25 square inch effective diaphragm area, this MP8000 Series model features a 9 13 PSI spring range and a reliable 3 4" stroke length. The assembly is designed for spring return stem up action, ensuring a fail safe normally open position in the event of