Comparison of Dynamic and Pneumatic Actuators
1. Anti-overload capability and service life
Electric actuators can only be used for intermittent operation and are therefore not suitable for continuous closed-loop operation. Pneumatic actuators, on the other hand, are overload-resistant and maintenance-free throughout their service life. No oil change or other lubrication is required. With a standard service life of up to one million switching cycles, pneumatic actuators are superior to other valve actuators.
2. Safety
Pneumatic actuators can be used in potentially explosive situations, especially in the following situations:
An explosion-proof valve (such as a Namur valve with a suitable coil) is required; the valve or valve island needs to be installed outside the explosion area, and the pneumatic actuator used in the explosion area must be driven by the gas pipe; the electric actuator is not easy to be used in the potential explosion hazard occasions and high cost.
3. Anti-overload capability
In the case of increased torque or special requirements for applied force, electric actuators will quickly reach the torque limit. Especially when the valve actuator is not opened regularly or closed for a long time, the advantage of the overload resistance of pneumatic actuators is obvious, because deposits or sintering can increase the starting torque. Using pneumatic components, it is easy to increase the working pressure as well as the force or torque.
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