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Another option you might consider is a rolling diaphragm cylinder. They generally are actuated by air, but liquid can be used if pressure is not high. Most are single acting, so they rely on a spring or gravity for the return stroke. Some manufacturers offer a double-acting design. They do not...

I just joined this group after finding it while searching for something else. I have a long history with Bud Trinkel and his family, so I'm probably best qualified to comment. Bud wrote these and other books as educational aids for his classes when he was an instructor at Alcoa. After he...