Adjustable twin tube shock absorber

A shock absorber for use in a suspension system, said shock absorber damping said suspension system by controlling damping fluid flow in said shock absorber during compression and rebound of said suspension system, said shock absorber comprising:

• an outer cylindrical body having a first end and a second end;
• an inner cylindrical body having a first end and a second end, said inner cylindrical body being slidable within said outer cylindrical body;
• a piston assembly coupled to said first end of said inner cylindrical body;
• and
• a glide tube positioned within said outer cylindrical body, said inner cylindrical body sliding within said glide tube in said outer cylindrical body such that said piston assembly slides within said glide tube;
• wherein:
• a first chamber is defined within said glide tube;
• a substantially annular second chamber is defined between said outer cylindrical body and said glide tube;
• a third chamber is defined within said glide tube;
• a first valve assembly is formed in said piston assembly;
• said first valve assembly controlling flow between said first chamber and said third chamber, with the flow control through said first valve assembly being adjustable such that compression damping and rebound damping are separately controllable;
• said piston assembly comprising a first piston and a second piston mounted on said inner cylindrical body, said first piston being adjacent said first chamber and said second piston being positioned between said first piston and said inner cylindrical body;
• a fourth chamber defined between said first and second pistons;
• said third chamber being in fluid communication with said fourth chamber;
• and
• said first valve assembly further comprising a first valve controlling only compression damping fluid flow between said first and fourth chambers to thereby control compression fluid flow between said first and third chambers.