Hydraulic Actuator-Shock Absorber?

[meenogre]

I've been poking around the web for a cylinder that can perform dampening and actuating. A standard shock absorber (like your car's) simply passes fluid from one side of the piston to the other through an orifice or valve or something to slow it down. Closing that would make the thing a normal hydraulic cylinder. What's the name for what I looking for? Surely it's out there!
D²

 

[alexit]

Miller Fliud Power had something onc that was plumbed with a valved cross-connection, but I am not sure what is the proper name for these