What we're going to delve into at the start here is a little bit about fluid power. Shock absorbers and dampers are a fluid power system, but they're a little different than what we traditionally know as fluid power. Of course, fluid power, the traditional fluid power is the use of fluid to transfer energy to do work, much like in this backhoe photo. Here you have a motor which drives a pump which creates fluid pressure. We have valves that direct the flow of fluid, and, of course, hoses and fittings which allow that fluid to transfer to a working pressure vessel.
As we show in the animation, we have a working pressure vessel with fluid pressure coming into and out of the pressure vessel to work against the piston to create a great deal of force and allows the pressure vessel to do a great deal of work. Of course, for all this to happen, you have to have seals which can work to control the fluid from bypassing or leaking. And these are dynamic seals that, as you can see, are on the piston and rod. But we also have static seals to keep the fluid contained.