Fault Characteristics of Rotary Travel Electric Actuators - News - Tianjin Bernard Fluid Control Technology Co., Ltd.

The rotary electric actuator is widely used in butterfly valves, ball valves, rotary plug valves (cam-type rotary valves), plug valves, etc., and can be broadly applied in power, petrochemical, steel, environmental protection, building materials, water conservancy, and wastewater treatment industries. The classification of rotary electric actuators and linear electric actuators is based on the trajectory of the valve stem. Rotary electric actuators typically move back and forth within a 90-degree range. Generally, valves with rotary closure elements are those whose valve stem rotates at an angle perpendicular to the valve shaft.

Rotary electric actuators feature three control modes: continuous adjustment, remote manual control, and on-site manual operation. They are characterized by their compact size and light weight. The actuator's functional parameters, commissioning, and on-site operation are all set using a handheld infrared remote control, without needing to open the cover. The electrical control wiring uses a plug-in structure design, which is convenient and time-saving.

To improve the reliability of rotary electric actuators, it is necessary to minimize and eliminate faults as much as possible. Some faults of valve electric actuators can be resolved through adjustments. Some occur due to long-term use and poor accuracy, requiring maintenance or parts replacement to restore performance, while others result from poor initial actuator design and need improvement or modification to eliminate.

1. Fault Characteristics of Rotary Electric Actuators

1) Faults during the commissioning phase: Faults in newly purchased actuators are relatively complex, characterized by quality issues in design, manufacturing, installation, etc. Management issues from the actuator manufacturer are often intertwined.

2) Early and mid-term operational faults: Generally, during mid-term operation, system components are in good working condition and the failure rate is low.

3) Late-stage operational faults: After a period of operation, right-angle rotary electric actuators experience wear of various components due to different operating frequencies and load conditions. At this stage, actuator fault characteristics include poor position feedback contact, low positioning accuracy, decreased stability, significantly reduced efficiency, and gradually increasing failure rates.

2. Occasional and sudden faults of rotary electric actuators

Sudden faults appear as occasional abrupt changes over time, with clearly identifiable fault areas and causes. They can be caused by non-human and human factors, such as damage to contact position feedback devices, wear and sticking of brake pads, parts breakage, or seal failure.

The above outlines common faults and treatment methods for rotary electric actuators, which we hope will help users operate rotary electric actuators more effectively.