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Partial Rotary Valve Electric Actuator Electric Control Valve Is The Most Widely Used
May 24, 2017

An overview of an Partial Rotary Valve Electric Actuator

Partial Rotary Valve Electric Actuator refers to the control system to electricity as an energy actuator, accept the instrument and other electrical signals, according to the size of the signal to change the amount of control, so that the input or output control object material or energy changes to achieve automatic Adjust the purpose.

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

Advantages and Disadvantages of Partial Rotary Valve Electric Actuators

Advantages: Partial Rotary Valve Electric Actuator energy access convenience, action sensitive, fast signal transmission, suitable for long-distance signal transmission, easy to use with the computer.

Disadvantages: Partial Rotary Valve Electric Actuators generally do not apply to fire and explosion occasions, and the structure is complex, expensive.

Two Partial Rotary Valve Electric Actuators working principle

The following brief introduction to the straight trip Partial Rotary Valve Electric Actuators and angular actuators.

Straight stroke and angular travel The working principle of the Partial Rotary Valve Electric Actuator is to receive the regulator or other instrument sent 4 ~ 20 mA standard value of the flow signal, after the actuator into a displacement thrust or corner torque to operate the switch, the valve Etc., to complete the task of automatic adjustment. These two actuators were previously composed of two parts: the servo amplifier and the actuator. Now there are mechanical and electrical integration of intelligent structure, their structure, working principle and use of methods are similar, the difference lies only in an output displacement (thrust), an output corner (torque).

Three Partial Rotary Valve Electric Actuators

(1) For the output of the actuator for the transfer to have enough torque for the output of the linear displacement of the implementing agencies have enough force in order to overcome the load resistance. In particular, high temperature and high pressure valves, the seal packing pressure is tight, after a long time after the closure of the opening time is often more expensive than normal, as the speed is not necessarily high, because the flow control and control does not need too fast The In order to increase the output torque or force, the motor output shaft has a reducer, if the motor itself is low speed, reducer can be simple.

(2) The gearbox of the gear unit or motor should have a self-locking characteristic. When the motor does not turn, the unbalanced load (eg the weight of the gate valve) can not cause a change in the angle or displacement. So often use the turbine worm mechanism or electromagnetic brake. With such a measure, in the event of an emergency power failure, the valve position can be maintained in the position before the power outage.

3) When a power failure or regulator fails, it should be possible to perform manual operation on the actuator in order to take emergency measures. To this end, there must be a clutch and hand wheel.

(4) When the actuator is operated manually, there shall be a valve position tracking signal on the actuator in order to provide the actuator with an automatic tracking basis (tracking is the need for no disturbance switching). This is both the need for the actuator itself to position feedback, as well as the need for valve position indication.

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

In addition to the above basic requirements, it is desirable to have optional non-linear characteristics on the actuator in order to facilitate coordination with the various valve characteristics. In order to be able to work with the computer, it is best to directly enter the digital signal. In recent years there are actuators with PID operation, which is called "digital actuators" and "smart actuators".

Currently the most widely used or analog Partial Rotary Valve Electric Actuators, of which China's electric unit combination instrument DKJ (output for the corner) and DKZ type (output for the linear displacement) is the most common.