I believe orbital velocity is about 73% of escape velocity at the same distance from the mass center of the body being orbited. Could be 71% because escape velocity divided by the square root of 2 seemed to be indicated.
Orbital velocity is the speed an object revolves around another object - Earth revolving around the Sun.
Escape velocity is the speed required to break away from an objects gravitational attraction...
Orbital energy is that amount of energy to keep a spacecraft or satellite in orbit around the earth. If the object fails to maintain this amount of energy, its orbit will get smaller and smaller...