Valve electric actuators have been widely used in various fields. The oil and gas industry is and will continue to be the largest buyer, followed by refineries, power and chemical industries. The municipal sewage treatment plant ranks fifth, after which the pulp and paper industry, and urban water supply. It has also been widely used in several other professions. They are the food, steel and pharmaceutical industries. Some of the remaining occupations are: metals, mining and semiconductors. Among the various types of valves, active dispatch control valves account for the largest proportion, which will account for more than 20% of the total market share. With the development of industrial automation, the traditional method of dispatching craft machinery is no longer applicable in many occasions. To complete the industrial automation of the pipe network system, it is inseparable from the implementation of the active valve in the pipe network system.
The use of valves is appropriate and extensive. Of course, because of the development of society, it is necessary to have an arrangement to actively control the valves, that is, electric actuators. Valve electric actuator
Because the valve is widely used, the manual mechanical dispatching method is no longer applicable in many occasions. This plan can work in a safer situation, and the efficiency has increased several times. Therefore, planning intelligent valve control equipment has practical meaning. Electric actuator is a very important field driving equipment in industrial process control system. Its power is convenient to use, and equipment debugging is simple.
Structure and characteristics of intelligent valve electric actuator
Structure of valve electric actuator
It is mainly composed of servo control system and implementation arrangement. It can withstand the common standard current signal output from dispatching unit, transmission unit or manual operator, and convert it into corresponding mechanical displacement output. The entire product range of intelligent valve actuation equipment is selected with a common modular plan.
It mainly consists of the following structures:
① Motor control system
Select time servo technology controller to control communication asynchronous electric
② Transmission arrangement
The worm turbine deceleration arrangement reduces the speed of the motor to the required output speed, and the drive arrangement is self-locking when the motor is not rotating.
Select QMCL (Fast Motion Control Speech) for programming to control the work of the motor
④ Valve connection arrangement
There are several types of output devices to choose from to connect the valve to the actuator. Appearance and dimensions conform to ISO 5210 or DIN 3338 standards. Can also supply DIN 3338 standard output drive equipment on request
In the manual mode, the travel switch can be set and emergency arrangements can be implemented. When the motor is in the suspended state, pulling the hand / active switching handle can disengage the motor from the transmission arrangement and connect the manual and transmission arrangements together.
Because electric actuators are planned with electric priority, once the electric motor is started, the manual arrangement should be separated from the transmission arrangement. The electric motor drives the transmission arrangement together, and the handwheel should not roll during the electric operation.
Characteristics of valve electric actuator
Compared with pneumatic and hydraulic actuators, electric actuators have three advantages:
(1) No special air source, air purification and other equipment are needed, even when the power supply is out of power, the original implementation position can be maintained;
(2) can transmit signals over long distances, cable laying is much more convenient than gas and liquid pipe laying, and is convenient for line inspection;
(3) It is convenient and concise to connect with the computer, and is more accustomed to using new electronic information technology.
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