The electric gate valve
actuator is a gate valve controlled by an electric actuator. The gate valve can be operated remotely through the electric actuator. Usually, the electric actuator is installed in the upper part of the gate valve. Introduction to the structure of electric gate valve: There are two types of electric gate valves: one is a quarter-stroke electric valve: a quarter-stroke electric actuator is used with a quarter-stroke valve to realize the internal rotation of the valve within 90 degrees to control the flow of fluid in the pipeline, and the other is Straight-stroke electric valve: The straight-stroke electric actuator is used in conjunction with the straight-stroke valve to realize the up and down movement of the valve plate to control the flow of the pipeline. This valve is usually used on equipment with a higher degree of automation for the best horizontal installation and adjustment accuracy. Overview of the internal structure of an electric actuator The widely used definition is that it can provide a linear or rotary motion drive, which uses a certain type of drive energy and control signal to work. The liquid, gas, electricity or other energy sources used by the actuator are converted into driving force by motors, cylinders or other devices. The basic types of electric actuators are three driving methods: partial rotation (partial rotation), multi-rotation (multi-rotation) and direct travel (linear). The characteristics of the internal structure diagram of the electric actuator are used to control the valves with 0°～90° rotation, such as butterfly valves, ball valves, dampers, baffle valves, plug valves, and shutter valves. It is widely used in petroleum, chemical industry, water treatment, shipbuilding, papermaking, power station, heating, light industry and other industries. It uses AC power such as 380V/220V/110V/DC24V as its driving power source, and uses 4-20mA, 0-10V, 1-5V control signals to control valve switching and adjustment. Realize automatic control, with a large output torque of 2000N. The main structure and working principle of the electric actuator. The electric actuator is mainly composed of a servo amplifier and an actuator. The operator can be connected in series. The servo amplifier receives the control signal sent by the controller and combines it with the feedback signal of the output displacement of the electric actuator. In comparison, if there is a deviation, the difference will be amplified by the power and then drive the two-phase servo motor to rotate. Then the speed reducer will drive the output shaft to change the angle of rotation. If the difference of the electric actuator is positive, the servo motor rotates forward and the output shaft angle increases; if the difference is negative, the servo motor reverses and the output shaft angle decreases. When the difference is zero, the servo amplifier outputs a contact signal to stop the motor. At this time, the output shaft is stabilized at the corner position corresponding to the input signal. This kind of position feedback structure can make the linear relationship between input current and output displacement better. The working principle of electric actuators The working principle of linear and angular stroke electric actuators is to receive the standard value of 4-20 mA galvanic signal sent by the regulator or other instruments, which will become displacement thrust or angular torque after the actuator. To complete the task of automatic adjustment by operating switches, valves, etc. These two types of actuators were previously composed of servo amplifier and actuator. Nowadays, the structure, working principle and use method of organic-electric integrated intelligent structure are similar. The only difference is that one output displacement (thrust) and one output rotation angle (torque). The structure of Denso can be divided into two types: one-piece type and split type. Introduction to the structure and characteristics of the valve electric actuator. Integrated electrical equipment is that all the control devices that control the operation of electrical equipment are installed inside the electrical equipment and integrated with the electrical equipment. Integrated electrical equipment is divided into ordinary type and intelligent type. All domestic electric device manufacturers can manufacture. Split type electrical equipment is that all the control devices that control the operation of electrical equipment are installed in a separate electrical control cabinet. Domestic manufacturers can provide split-type denso. In addition to ROTOCK, AUMA, EMG which can provide split type, the others only provide integrated type. Denso is divided into switching type and regulating type according to the working mode. The switch type mainly refers to the motor start times of Denso generally u003c600 times/min. On-off type Denso is only suitable for opening or closing the valve at one time. Regulated type mainly refers to the frequent commutation of Denso, and the number of motor starts generally reaches 1200 times/min. Adjustable Denso can accept 4-20mA analog signal and feedback valve position 4-20mA analog signal to meet the needs of closed-loop control.
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