James Cameron’s second AVATAR movie introduced viewers to “The Way of Water.” It’s especially important for ocean engineers to “think like water.” Observe, study, and learn the way.Fluid power refers to both
James Cameron’s second AVATAR movie introduced viewers to “The Way of Water.” It’s especially important for ocean engineers to “think like water.” Observe, study, and learn the way.
Fluid power refers to both liquid and gas. Two fluid power components to consider in controlling gas flow are the check valve, and the pressure relief valve. A check valve is an automatic one-way valve that constrains air flow to one direction. They can be useful in purge ports.
A pressure relief valve (PRV), sometimes called a pressure safety valve (PSV), or pop-off valve, is a safety device designed to protect a housing by venting high internal air pressure to the sea. The PRV automatically opens when pressure exceeds a predetermined differential limit, say 5psi over ambient, allowing pressure to vent in one direction. However, it can be shown that venting excess pressure and sealing out water are two different things.
Graphically, the different parts are represented by the symbols:
A PRV is represented graphically on the left. An adjustable PRV would show a diagonal arrow through the spring. A check valve is represented graphically on the right. Minimal spring force reduces the back pressure on the system. (Illustration courtesy of The Lee
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