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]
Air compressor oil is standard or synthetic oil made specifically for air compressors. Unlike motor oil, air compressor oil does not contain detergent and typically has lower amounts of carbon, sulfur. [pdf]
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