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Multi Rotary Valve Electric Actuator With Optional Nonlinear Properties
Oct 30, 2017

Multi Rotary Valve Electric Actuator is a kind of actuator which takes electricity as energy in the control system, receives the electrical signal which adjusts the meter and so on, according to the signal size changes the manipulation quantity, causes the input or the output control object's material quantity or the energy to change, achieves the automatic adjustment goal.

In industrial production, electric control valve is the most widely used. The electric regulating valve is composed of the actuator and the regulating mechanism (valve). The valve section is introduced in the front, so the Multi Rotary Valve Electric Actuator is only introduced in the electric regulating valve.

The following is a brief introduction to the direct stroke Multi Rotary Valve Electric Actuator and the angle stroke Multi Rotary Valve Electric Actuator.

The working principle of the direct stroke and the angular stroke Multi Rotary Valve Electric Actuator is to receive the standard value stream signal of $number Ma sent by the regulator or other instrument, and after the actuator becomes the displacement thrust or the angle torque, to operate the switch, the valve and so on, completes the automatic adjustment task. Both actuators were formerly made up of servo amplifiers and actuators. Now there is an intelligent structure of mechatronics, their structure, working principle and the use of methods are similar, the difference is only, an output displacement (thrust), an output angle (torque).

(1) for the output for the transfer of the actuator to have sufficient torque, for the output of the linear displacement of the actuator should have sufficient force to overcome the load resistance. In particular, high temperature and high pressure valves, the sealing filler pressure is relatively tight, after a long period of time off after the opening often more than normal circumstances to cost more force, as for the action speed is not necessarily very high, because the flow regulation and control does not need to be too fast. In order to increase the output torque or force, the output shaft of the motor has reducer, if the motor itself is low-speed, the reducer can be simpler.

(2) The transmission system of the reducer or motor should have self-locking characteristic, when the motor is not turned, the unbalanced force of the load (such as the deadweight of the gate valve) cannot cause the change of the corner or displacement. So often use a turbo-worm mechanism or an electromagnetic brake. With such a measure, the position of the valve can be maintained before the power outage in the event of an accidental blackout.

(3) When the power failure or the regulator fails, it should be able to perform manual operation on the actuator in order to take emergency measures. Therefore, the clutch and handwheel must be operated.

(4) In the Actuator manual operation, in order to provide the regulator with automatic tracking basis (tracking is the need for no disturbance switching), the actuator should have a valve-bit tracking signal. This is not only the need for the actuator's position feedback, but also the need of valve position indication.

(5) In order to protect the valve and the transmission mechanism is not damaged by excessive operating force, the actuator should have a limit device and a limiting force or torque device.

In addition to the above basic requirements, in order to facilitate and a variety of valve characteristics, preferably in the actuator with optional non-linear characteristics. In order to be able to cooperate with the computer, it is best to input digital signal directly. In recent years, there are actuators with PID functions, which are called "Digital actuators" and "Smart actuators".

At present, the most widely used is the analog Multi Rotary Valve Electric Actuator, in which the dkj (output is the corner) and the Dkz type (output of the linear displacement) are the most common in the electric Unit combination instrument.

Multi Rotary Valve Electric Actuator also known as the valve electric device, it is in different industries in the field of appellation, in the industrial pipeline valve industry is called the valve electric device, in the instrumentation industry called Multi Rotary Valve Electric Actuator, but now the industry has no very clear distinction, this article is concerned about the appellation problem will be unified called Multi Rotary Valve Electric Actuator.

Valve in the industrial pipeline control is a frequent use of important equipment, electric valve with the development of industrial automation, because of its power source is easy to obtain, and generally without the advantages of maintenance, compared to the pneumatic, hydraulic and other different driving modes of equipment use is more common. In industrial occasions, electric valves must have higher reliability and safety, when the valve can guarantee performance and life, the safety and reliability of the electric valve depends on the Multi Rotary Valve Electric Actuator, so the performance and control level of the Multi Rotary Valve Electric Actuator is the comprehensive performance of the whole technology of electric valve. Therefore, in addition to some essential factors to be considered in the selection of Multi Rotary Valve Electric Actuator, it is necessary to put forward reasonable technical requirements to maximize the value of electric valves.

Many types of Multi Rotary Valve Electric Actuators, different types and functions of Multi Rotary Valve Electric Actuators and valves can be called electric valves, but often in the design, selection process only pay attention to the parameters of the valve ignored or not clear the relevant requirements of the Multi Rotary Valve Electric Actuator, so that not only the electric valve can not play the best performance, and in the installation, commissioning, The use of the process will also bring unnecessary trouble, even to the production of serious consequences.