HPost,
Thanks. Sometimes all you need is someone to tell you what the right language so you know what to ask for. "Proportional pressure reducing valve" sounds good to me. The automation can wait until I get paid for this first job. Thank you.
Jeff
I periodically have to run tension and compression tests on slender steel shafts or tendons to loads of say 100 kips. Mostly contractors show up with Enerpac "donut" hollow ram hydraulic cylinders and either hand pumps or electric pumps. These sometimes have a single valve for holding pressure...
