REXA Electraulic™ Actuation

摘要

REXA Electraulic™ Actuators are widely used throughout the pipeline industry. Actuation needs within the pipeline industry are diverse, due to the wide range of product properties, flow rates, pipeline sizes and pipeline lengths encountered. Both linear and rotary actuators, from the smallest to the largest, are applicable. REXA Actuators have been used to improve control performance on a number of different pipeline applications, including crude oil, refined products, other liquids, and gas products. Flexibility in pipeline operation requires frequent changes in flow rates and delivery sites. Responsive line pressure control is essential to prevent line shutdowns due to pressure excursions. High resolution and fast response are necessary for successful applications. A few pipeline applications where REXA Electraulic™ Technology can be found are Pump Station Pressure Control, Terminal Inlet Pressure Control, Metering Balance Control, Meter Back Pressure Control and Pump Recycle Control. With REXA's closed loop system, pipeline processes can be controlled directly. Electraulic™ Technology is a unique and revolutionary approach to actuation that combines the simplicity of electric operation, the power of hydraulics, the reliability of solid state electronics, and the flexibility of user configured control. Electraulic™ Actuators and Drives offer a self-contained, positive pressure, hermetically sealed system that requires minimal power consumption. There are no filters, large reservoirs or routine oil maintenance needed. REXA's design eliminates the high frequency maintenance requirements that are normally associated with hydraulics and reduces the amount of oil in the system by more than 90%. REXA has superior controllability in comparison to pneumatic or electric actuator options by an order of magnitude. Pipeline applications require extraordinary dynamic performance from the control system in the throughput of the pipeline. The control system must be able to respond quickly with high precision and minimal dead time in order to meet the objectives. The performance of the control valve and actuator are key components that affect process efficiency. REXA Electraulic™ Actuation provides the high performance that is required to meet the challenges.