Cylinders & Actuators

Most hydraulics courses include an example to illustrate an intensification problem that occurs when holding vertical loads with a cylinder. A blocked-center directional control valve stops the cylinder in mid-stroke....More

The Old Timer of Royal Oak, Mich., was a regular contributor to H&P years before we ever even heard of the internet. But most of his advice is just as ueful — and interesting — today. So rather than leave his wisdom printed on pages archived in our storage room, I pulled out issues from the late 1980s and early 1990s and have been reproducing relevant entries in this blog. Here is my 15th entry, which was originally published in the March 1989 issue:...More