REXA Electraulic™ Actuation

REXA Electraulic™ Actuation is a one-of-a-kind, engineered solution that is adaptable to any process control application.

What is Electraulic™ Actuation Technology?

REXA is committed to maximizing your return on investment and supporting you over the long term. REXA actuators deliver unparalleled performance with little cost of ownership and whether you have goals of maximizing uptime, increasing throughput and efficiency, or improving safety you can #RelyOnREXA.

Electraulic™ Actuation consists of two major components: the mechanical sub-assembly and the electrical sub-assembly. Each component plays a critical role in combining the benefits of major actuator types (pneumatic, electric, hydraulic) while eliminating the drawbacks of each technology. The foundation of our technology is the patented breakthrough in hydraulic circuitry called the Flow Matching Valve System. In conjunction with a bi-directional gear pump coupled to either a DC stepper or AC servo motor, this system is a highly efficient method of moving hydraulic fluid from one side of a double-acting cylinder to the other.

REXA provides both Linear and Rotary actuators, as well as Damper Drives, depending on your application. You can learn more by clicking the images to the right.

How it Works

While monitoring travel and signal ranges set during calibration, the CPU converts the incoming control signal into a target position. An active feedback sensor directly mounted to one end of the cylinder output shaft determines the actuator’s current position. The difference between the target and the current position interprets as an error (deviation). If the error exceeds the user-programmed deadband, the CPU will initiate corrective action by starting the motor.

A bi-directional gear pump, driven by the motor, generates the necessary pressure to overcome the process conditions (see graphic below). System oil travels from the pump through a series of pilot-operated check valves, known as Flow Matching Valves (FMVs). The FMVs manage the transfer of oil out of one side of the cylinder and into the other. This transfer of oil drives the actuator to the target position. Once the system determines the actuator is at the target position, the motor and pump stop, and the FMVs close (seat). The FMV seating then hydraulically locks the cylinder in place. The motor will only turn on again if the incoming control signal changes. Motor operation is not required to maintain the actuator’s position.

Linear Actuators

REXA Xpac Series 3 Linear Actuators provide rigid hydraulic stability and immediate signal response with no oil-based maintenance.

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Rotary Actuators

REXA Xpac Series 3 Rotary Actuators provide reliable quarter-turn actuation with a simple rack and pinion design.

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Damper Drives

REXA Damper Drives can be configured to utilize a rack and pinion hydraulic cylinder or a double-acting linear cylinder driven by one or more Electraulic™ Power Modules.

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