At present, the common actuators are: pneumatic, electric, hydraulic, gas-liquid linkage, electro-hydraulic linkage, what is the difference between hydraulic, gas-hydraulic linkage, and electro-hydraulic linkage?
Hydraulic mainly refers to setting up an oil station uniformly, and then distributing oil to each hydraulic actuator, mainly used in the dense valve area of ​​the factory. Gas-liquid linkage is often used in dispersed areas and it is not easy to lay cables. The medium in the pipeline is compressed gas (such as the West-East Gas Pipeline). The compressed gas in the pipeline is used as power to drive oil to the actuator. There is very little electro-hydraulic linkage. An actuator corresponds to a motor to increase the pressure of the driving oil to make the valve act.
Pneumatic devices and hydraulic devices are mostly composed of compressed gas or hydraulic pressure driven cylinders), and a few are composed of pneumatic motors or hydraulic motor-driven reducers. The former is widely used as a part-turn and linear reciprocating drive; the latter can be used as a multi-turn rotary drive, and some can be used in common with electric devices. They have the characteristics of compact structure and fast opening and closing, suitable for indoor or corrosive, flammable and explosive environments; the disadvantage is that the piping is more complicated and not suitable for remote control. The pressure of the pneumatic device is generally (4 ~ 6) × 105 Pa, and the output is small. The hydraulic device adopts higher pressure and has a larger output.
An electric device uses a motor to drive a deceleration mechanism to drive a valve. Some valves are driven by electromagnetic forces (see solenoid valves). The electric device of the valve has two types of multi-turn type and part-turn type. It is characterized by convenient power supply, easy adjustment, and large output, suitable for remote control and automatic control needs, and is widely used. However, when designing and manufacturing, it is necessary to consider the influence of outdoor, flammable and explosive environmental conditions on the electric device, and the structure is relatively complicated.
The gas-liquid linkage device and the electro-hydraulic linkage device are composed of a hydraulic mechanism with compressed gas or electric power as a power source. The common one is the part-turn type, which is characterized by rapid action and large output, which can drive large-diameter valves. This kind of device is often used for the shut-off valve or emergency automatic shut-off valve of oil and natural gas long-distance transmission pipelines.
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