Replacing the upper stem wiper during service prevents debris that has accumulated on the stem from being pulled into the new stem packing

Its flat diaphragm design provides the necessary power to maintain system stability even under fluctuating operating conditions

Rugged Construction: Features a forged brass body and stainless steel/brass trim for resistance to corrosion in closed-loop systems

Industrial Durability: Class F rated for continuous duty in demanding ambient temperature conditions

Units with intermittent pilot ignition (IPI) typically use a flame sensor or a different pilot-proving assembly

Schneider Electric (Barber Colman) MK-4411 Pneumatic Damper Actuator Els PW 29614 Replacing the upper stem wiperThe Schneider Electric (Barber Colman) MK 4411 Pneumatic Damper Actuator is a heavy duty proportional pneumatic actuator designed for precise control of dampers and air valves in high demand HVACR systems. Built with a rugged cast aluminum body and a replaceable beaded molded neoprene diaphragm, this 11 sq. in. effective area actuator ensures reliable performance in both industrial and commercial applications. It features a 5 to 10 PSI spring range