Pumps have an influence density about ten moments better than an electric motor (by volume). They can be powered by an electric motor or an engine, related by means of gears, belts, or a flexible elastomeric coupling to lessen vibration. Directional control valves route the fluid to the desired actuator. https://charliepnwir.bloginder.com/18173164/the-fact-about-pneumatic-actuator-that-no-one-is-suggesting