Compressed air pressure for valves
Compressed air pressure for valves
(OP)
I am wondering, what is a common range of air pressure required to actuate control valves? Butterfly and globe.
Thanks!
Thanks!
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Compressed air pressure for valves
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Compressed air pressure for valvesCompressed air pressure for valves(OP)
I am wondering, what is a common range of air pressure required to actuate control valves? Butterfly and globe.
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RE: Compressed air pressure for valves
RE: Compressed air pressure for valves
- Higher air pressure allows the use of smaller, less expensive valve actuators.
- Higher pressure provides more motive force for faster response time from the control valves.
- Higher pressure minimizes the pressure fluctuations that are experienced in the instrument air system, thus preventing occasional sluggish response from some of the valves.
I suggest operating your instrument air at about 100 psig, but consult with an instrument engineer on this.RE: Compressed air pressure for valves
"21.2 Air supply system
For proper unit instrumentation operation, instrument air shall be ... at minimum pressure of approximately 100 psig (700 kPag) at the inlet to instruments air header.
...
21.2.11 Distribution system
Lines in the distribution system should be sized a manner that the maximum pressure drop between the dryer outlet and the most remote consumer does not exceed 5 psi (35 kPa) when all consumers are taking air at maximum rates."
All it means 665 kPag at the inlet to control valve's actuator.
RE: Compressed air pressure for valves
RE: Compressed air pressure for valves
RE: Compressed air pressure for valves
RE: Compressed air pressure for valves
So looks like we usually deal with up to 100 psi, and that would be for a small actuator. 40-60 psi for a larger one.
Thanks everyone!
RE: Compressed air pressure for valves
This relatively low air pressure did require the use of large (~12" diameter) rolling-diaphragm valve actuators.