Electric Actuator
The DQ electric valve actuator consists of a first-stage multi-turn electric valve actuator and a second-stage superimposed gearbox. It has compact structure, reliable performance, convenient adjustment and other holding points. The performance index reaches the GB/T24923-2010 standard.
This series of electric valve actuators is used for valves with part-turn of the valve disc, such as ball valves, butterfly valves, dampers, etc. It is an indispensable drive device for the valve to achieve remote control, centralized control and automatic control. It is an important unit in the control of industrial pipeline series and is widely used in power stations, petroleum, chemical industry, metallurgy and other industries.
1. Power supply: three-phase four-wire, 380V, 50Hz (special orders can be 415V, 660V, etc., frequency can be 60Hz)
2. Working environment: (If it is explosion-proof, please refer to the instructions of the first-level electric actuator)
2.1 Ambient temperature: -20C-60C 2.2 Ambient relative humidity: ≤90% (at 25C)
2.3 The working environment does not contain corrosive, flammable, and explosive media;
2.4 Protection level IP67
3. Short-time work system, the time is 10 mins;
product structure
1. Worm
2. Claw
3. Flange
4. Worm gear
5. Body
6. Closing striker
7. Locking nut
8. Opening striker
9. Cap nut
10. Gasket
11. Output shaft
12. Cover
13. Indicator
Special motor
The motor for regulating valve is the driving component of the electric actuator, and its characteristic requirements are different from those of general motors. Because the actuator works frequently and is often in the starting working state, the motor is required to have the characteristics of high starting torque, small moment of inertia and low starting current, so that the motor temperature rise will not be too high when the motor is started frequently, and there is enough torque to make the electric actuator move from static to action.
Gearbox and manual switching mechanism
The rgearbox converts the output power of the high-speed, low-torque motor into the power of the output shaft of the low-speed, high-torque actuator. The manual switch is semi-automatic, that is, when it is manual, move it in the direction of the arrow on the switch handle, and it will automatically reset when it is electric.
Stroke control mechanism, torque control mechanism, opening mechanism
The function of the travel control mechanism is to limit the electrical limit position. The torque control mechanism is a protection mechanism designed to protect the actuator and valve. The opening mechanism is used to indicate the opening and closing direction and position of the valve.
working principle
The regulating electric actuator is the main executive part of the automatic control system. It is powered by a three-phase or single-phase AC power supply, receives standard signals (including analog and digital quantities), and converts this signal into corresponding mechanical displacement or angle to operate the regulating mechanism to complete the automatic adjustment task. When the regulating electric actuator is in the automatic state, the MCU digital control module on the actuator receives the standard analog signal (4~20mA, DC) from the automatic control system, and compares it with the standard analog signal (4~20mA, DC) from the valve position transmitter on the electric actuator. If the difference between the two is greater than the dead zone set according to user requirements, the MCU digital control module sends a control signal to drive the regulating electric actuator to run in the direction of reducing the deviation between the two, until the deviation between the two is less than or equal to the dead zone set by the electric actuator, the MCU digital control module sends a control signal to stop the electric actuator. When the regulating electric actuator is in the electric manual operation state, the electric actuator can be operated by the internal jog button of the actuator.
adjustment
Since this actuator needs to be assembled with the valve, the stroke mechanism, torque mechanism and opening indicator mechanism of the electric actuator must be adjusted before operation after assembly. If the fully open and fully closed positions of the valve are controlled by the stroke mechanism, the torque mechanism does not need to be adjusted. If the fully closed position of the valve is controlled by the torque mechanism or the fully open and fully closed positions are controlled by mechanical limits, the torque mechanism must be readjusted. 1. If the fully open and fully closed positions of the valve are controlled by the stroke mechanism or the torque mechanism, the mechanical limit must be loosened before adjusting the stroke or torque. 2. If the fully open and fully closed positions of the valve are controlled by the mechanical limit and the torque mechanism sends a signal, the adjustment method is as follows: Manually operate the electric actuator to put the valve in the predetermined position; Adjust the corresponding mechanical limit so that it just hits the output shaft, and tighten the locking nut and cap nut of the striker pin; Adjust the torque mechanism and gradually increase the output torque value until the valve can be turned into place.
applications
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