Pneumatic actuator instrument air pressure
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When selecting pneumatic actuators, should one take into account the pressure drop in the instrument air pipeline? For example, if the instrument air pressure provided by the client is 5 barg, is it feasible to choose an actuator based on this value of 5 barg, or is it necessary to select an actuator that can operate at a lower pressure?
The instrument air pressure specified in the data sheet is already lower than the pipeline network pressure; the manufacturer will select a suitable pressure control actuator based on this value, and this figure is also specified in the tender technical specifications.
Do actuator manufacturers take into account the pressure drop of filter decompression valves when selecting them?
Of course, the filter pressure reducing valve is included as part of their set.
Yes, the source pressure should be appropriately reduced for selection；
It is not recommended to select the valve based on the owner’s gas supply pressure of 5 BAR, as there is no margin left, which may result in slow valve operation or incomplete closure. The overall unified design requirements should be implemented. If no requirement was specified in the initial stage, it is necessary to consult with the owner and design the system at 4 Bar or 3.5 Bar. The consequence of this is that the actuators may be larger and the cost higher, but the performance will be stable and reliable, with no design-related issues.