What are the differences of electric actuator hydraulic actuator and pneumatic actuator?

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In the field of valve automation, valve actuators are used to open and close valves to achieve automatic control. There are several types of valve actuators, each with its own advantages and disadvantages, so how to choose the right valve actuator in the right place?

At present, it is mainly divided into pneumatic actuators, electric actuators, hydraulic actuators, electro-hydraulic actuators, etc. The advantages and disadvantages of these actuators are introduced below.


Pneumatic actuators


The advantages of pneumatic actuators are:


1. The structure is relatively simple, the maintenance is simple and convenient, and the use is safe

2. The switching speed can be greatly improved

3. The gas is highly compressible and elastic when closed

4. It is easier to obtain gas source

5. After installing the governor, the switching speed can be adjusted according to your own needs


The disadvantages of pneumatic actuators are:


1. Due to the compressibility of the gas, it is not easy to maintain the speed all the time, and it is not stable

2. The structure is relatively large, so it is not suitable for valves with large diameter and high pressure



Electric Actuator


The advantages of electric actuators are:


1. Easy to install

2. Easy to maintain and repair

3. The volume can be ultra-miniaturized

4. Wide range of output torque

5. The machine can be automatically locked

6. Strong applicability, not affected by ambient temperature

7. It is easy to control, can use various signals freely, and is suitable for amplification, memory, logical judgment and calculation.


The disadvantages of electric actuators are:


1. The structure is more complicated

2. It is prone to failure during operation



Hydraulic Actuator


The advantages of hydraulic actuators are:


1. Simple structure and small volume

2. The output strength is large

3. Due to the viscosity of the hydraulic shaft, the efficiency can be improved

4. It has self-lubricating properties and anti-rust properties

5. It can be automatically controlled from a distance

6. Switchable high and low speed to achieve variable speed


The disadvantages of hydraulic actuators are:


1. It is not convenient for piping and maintenance

2. Hydraulic components and pipes are easy to leak

3. Changes in oil temperature will cause changes in viscosity

4. Not suitable for various operations on signals



According to the above, it can be known that various valve actuators have their own advantages and disadvantages, but according to their own needs, you can still choose the one that suits you. Through careful comparison, you can definitely find the valve actuator that suits you.

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