A check valve is like the valves in your own heart. The check valve just like your heart valve keeps fluid moving in only one direction. When lowriders use aircraft check valves they are usually ones made by GAR or Adex. It is not recommended to hop a car with aircraft checks but they are great for old school Pesco power packs and so forth.
A slowdown valve is used to control the flow of hydraulic fluid returning to the hydraulic reservoir.
Aircraft Check Valve Pictures
Here are two GAR check valves rated for 3000 PSI with a 250 PSI crack pressure. We wanted to thank Tony of WWW.SQUAREDUMP.COM for the hook up.
Here you can see the ratings and the part number.
Aircraft Slowdown Valve Pictures
Here is a small 90 degree aircraft slowdown valve. Small 90 degree valves are used on aircraft setups where the installer wants less clutter for a clean show quailty install.
Here is the tag.
This small 90 degree slowdown would be mounted on the oxygen / oil tank.
The parts are treated for longer shelf life.
Here are some Parker slowdown valves.
You can see these are very large with 3/4 inch ports.
The valve body says Parker.
The handle will also say Parker on it.