PowerRac actuators are not your typical rack and pinion actuator! Nominal play in the gears combined with a rigid coupling between the valve shaft and positioner drive allows thrust from the cylinder to precisely position the valve on modulating service. A unique internal square collet* clamps the drive pinion to the valve shaft with a single external screw, totally eliminating all backlash in the drive connection. Direct actuator to valve mounting makes the valve/actuator package as compact as physically possible.
PowerRac is a time and application proven design for all DeZURIK quarter turn valves. They actuators feature a high opening torque, necessary for on-off applications, and they also maintain that high operating torque throughout the full stroke, important on modulating service. A unique externally adjustable internal coupling between the valve shaft and the actuator drive allows actuator to be close coupled to the valve with a tightly clamped drive connection.
PowerRac actuators are enclosed and sealed to protect internal parts from grit, moisture and corrosive contaminants. They are permanently lubricated for smooth, efficient operation. The cast iron housing and fiberglass cylinder provide excellent corrosion resistance and long life.
PowerRac actuators feature external, fully adjustable travel stops. For applications, where fail-safe operation is a requirement, PowerRac actuators are available with a spring return option.
