Corrosion Resistant: Hayward® PMD and PMS actuators feature heavy-duty, corrosion resistant construction. These actuators are designed to stand up to most corrosive environments and other harsh conditions without the need for epoxy coatings.
Two Modes of Operation: Series PMD actuators are air-to-air (double acting), while the PMS Series are air-to-spring (fail safe) actuators. Air-to-air actuators require air pressure for both actuation cycles, open and close. Air-to-spring actuators have a mechanical spring return unit enclosed in the actuator housing that is used to operate one of the actuation cycles, either open or close. Both types work with all True Union and Three-way Ball Valves up to 2" in size.
Rugged Design: The actuators feature a proven, heavy-duty rack and pinion design that is extremely reliable. The actuators require no maintenance. The internal lubrication lasts indefinitely, even in applications where the actuator is cycled frequently.