During a vertical down-stroke, the cylinder load and force are combined to produce a “lunge” movement. This is especially an issue when the load is significant compared to the force of the actuator. .
Use the force of the load to push the cylinder down. This completely removes the issue with the inrushing of compressed air. Issues with this method; the actuator does not exert any. .
The cause of our undesired motion is the inrushing air that “slaps” the top of the piston, producing a large amount of force from the actuator that is combined with the mass hanging down.. .
Now let us take the above circuit and add piloted check valves to add a level of safety if air pressure is lost. The piloted check valves do not. [pdf]
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