Type: Typical failure of electric ball valve. The safety valve, the spring between the valve stem and an actuator is installed at the position of its gate valve, which urges the door to reciprocate. It may be a closed body. The control fluid acts on the piston in the actuator to overcome the spring force, so as to maintain it in other positions for a long time under controlled conditions. When the valve with this structure is abandoned to a greater depth and the valve body pressure is far lower than the surrounding sea surface, the spring of electric ball valve must be sufficient. It will happen in extreme cases. Thereby reducing the size of the actuator and increasing the depth level of the valve.

Elimination method of electric ball valve:

By the fault of electric ball valve, which is included in this category, the valve body has a traditional valve, spanning structure and a cavity, which is the position between opening and closing and is responsible for moving the actuator between these positions. Since this type of valve is also true, the actuator includes a bonnet mounted on the valve body and a valve stem connected to another valve.

Electric valve actuator is generally composed of electric control part and power supply part, so the common faults in electric valve actuator can be divided into control part fault and power supply part fault. Below, we will introduce in detail the common faults of the power supply part and their causes analysis and troubleshooting measures. The power of electric valve actuator is generally provided by motor, so it is necessary to master some knowledge of motor. In this way, the hidden dangers of motor accidents on electric actuators can be found and eliminated as soon as possible, and the safe operation of electric actuators and electric valves can be ensured.

Mechanical failure:

1, motor bore sweeping: the gap between stator and rotor of motor is very small, which may easily lead to collision between stator and rotor. Once the axes of the frame, end cover and rotor are different, the stator and rotor will collide, which is often called bore sweeping. The common factors causing different shaft phenomena are: the motor bearing is seriously out of tolerance, the inner hole of the end cover is worn, and the stop hole of the end cover and the stop hole of the base are worn and deformed. If these phenomena are found, the bearing should be replaced, or the end cover should be replaced or brushed.

2. Motor vibration: First, distinguish whether the vibration is caused by the motor itself, the faulty transmission device or the mechanical load, and then eliminate it according to the specific situation. The vibration caused by the motor itself is mostly caused by poor dynamic balance of the rotor, poor bearings, bending of the rotating shaft, or different axes of the end cover, base and rotor, or uneven installation foundation of the motor, improper installation and loose fasteners. Vibration will produce noise and additional load.

3. The bearing is not working normally: If the bearing is not working normally, it can be judged by hearing and temperature according to experience. Touch the bearing housing with a listening stick (copper stick). If you hear a crash, it means that one or more balls may have been smashed. If you hear a hiss, it means that the bearing is short of lubricating oil. It is not easy to add too much grease. If it is too much, there will be great friction between the rotating part of the bearing and the grease, which will generate heat. Generally, the grease in the bearing box is about one-half to two-thirds. If the bearing is not installed correctly, the tolerance is too tight or too loose, which will also cause the bearing to heat up.