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I am working on a hydraulic system that is powered by an air-hydraulic piston pump, the pump uses pneumatic pressure to drive a piston which then pressurizes the hydraulic system. The system needs to be revised to have the air supply to these pumps cut off as soon as the hydraulic pressure reaches the needed 500 bar, in order to stop the pumps and prevent unnecessary wear or pressure. I looked for hydraulically actuated valves for pneumatic systems but could not find any, therefore my question is if these valves actually exist or if I should look for a different method?

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  • $\begingroup$ Pressure sensor on the hydraulic side controlling the electric to pump. $\endgroup$
    – Solar Mike
    Sep 21, 2022 at 13:04
  • $\begingroup$ There is no electric in the entire system unfortunately, the pumps are powered solely by air and the rest of the system is hydraulical/mechanical. $\endgroup$
    – David
    Sep 21, 2022 at 13:39
  • $\begingroup$ take pneumatic out of your search, you should get what you want. Most valves will work on air just fine. $\endgroup$
    – Tiger Guy
    Sep 21, 2022 at 14:00

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A better approach would be continuously regulating (limiting) air pressure supplied to the pump, rather than suddenly shutting off air once hydraulic pressure reaches 500 bar. No need for hydraulic pressure to actuate a pneumatic valve in this case. Typical example:

air-driven-hydraulic-pump

https://www.highpressure.com/products/pump-products-and-systems/sprague-air-driven-pumps/related-sprague-content/how-sprague-air-driven-hydraulic-pumps-work/

Back to the original question, it's certainly possible to actuate pneumatic valves using hydraulic pressure if needed. However solenoids or air pressure is more practical in most cases. One exception would be large steam valves which use hydraulic actuation:
https://www.moog.com/news/ideas-in-motion-control/2007/06/new-generation-of-electrohydraulic-steam-valve-actuation-system-for-turbines.html

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