Schneider Electric (Barber Colman) MK-6821 Proportional Control R-410A Fail-Safe Protection: Mechanical spring return

Fail-Safe Protection: Mechanical spring return ensures the actuator returns the valve to its normally closed position upon loss of power

Rugged Build Quality: Built for HVACR professionals who require components capable of withstanding the high-cycle demands of commercial environments

Whether you are commissioning a new supermarket refrigeration system or performing routine maintenance on Danfoss system managers like the AK-SM 800 series

Can I use this XB-1033HW90-1B on an internally equalized valve

This unit is electronically balanced to reduce vibration and prevent premature wear on the fan blade hub

Schneider Electric (Barber Colman) MK-6821 Proportional Control R-410A Fail-Safe Protection: Mechanical spring returnThe Schneider Electric (Barber Colman) MK 6821 Proportional Control is a rugged 50 square inch pneumatic valve actuator engineered for precise linear movement in commercial HVAC systems. This spring return actuator operates on a 8 13 PSI pneumatic signal range, providing reliable fail safe positioning during pressure loss. Encased in a durable Nema 1 enclosure, it features a 1 8" NPT air connection and a 1" nominal stroke, making it a standard choice