Advantages and Disadvantages of Pneumatic Valves and Electric Valves

Release Time

2022-06-24 17:14

Pneumatic valves require greater actuating torque than electric valves; their opening and closing speeds are adjustable; they feature a simple structure and are easy to maintain. Moreover, due to the inherent cushioning effect of compressed air during operation, they are less likely to be damaged by jamming. However, pneumatic valves depend on a reliable air supply, and their control systems are generally more complex than those of electric valves.

Pneumatic valves offer quick response, safety, and reliability; many plants with stringent control requirements even dedicate compressed-air stations specifically to pneumatic instrumentation and control components. Electric valves, on the other hand, require electricity.

The function of a pneumatic valve positioner is to receive the output signal from the pneumatic controller and generate a pneumatic pressure signal that is proportional to the controller’s output, thereby controlling the pneumatic control valve.

Pneumatic valve positioners come in a wide variety of types; based on their operating principles, they can be classified into two main categories: displacement-balanced and force (torque)-balanced.

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