In midstream oil and gas pipeline fluid control, the medium often possesses high viscosity. Due to the accumulation of impurities and foreign matters in the pipe, along with factors such as uneven thermal expansion or eccentric moment, valves frequently experience a "jamming" phenomenon within certain opening ranges. If a quarter-turn electric actuator lacks protection mechanisms and continues to force operation during a jam, it can twist and break the valve stem or cause the motor to burn out, severely threatening the operational safety and reliability of the midstream pipeline network.
To address these complex challenges in hazardous area fluid control, modern explosion-proof electric actuators incorporate the "Over-torque Protector" as a core safety configuration for equipment selection. When a valve is stuck during operation, the output torque of the actuator rises rapidly to a preset critical value; at this point, the torque switch will immediately switch off the circuit to protect the valve and actuator from damage. This precise torque test control, based on electromagnetic torque, provides foundational anti-overload protection for pipeline equipment.
For even more complex pipeline media, certain actuators utilizing DC brushless motors are equipped with an intelligent "automatically low speed and large torque push forward function". When the jamming phenomenon is detected, the actuator will automatically reverse back up a bit, then proceed with low speed and large torque to push forward until the "jamming" phenomenon has completely disappeared, subsequently returning automatically to its normal speed and torque. Supported by a broad output torque range spanning from 50Nm up to 3900Nm, this mechanism perfectly neutralizes the risk of pipeline paralysis caused by viscous fluids or impurities, serving as a critical technology to ensure the long-term stable operation of midstream oil and gas transportation.