Hydraulic Hand Pumps are the backbone of most jacking systems. Using the simple principle of leverage (the handle pushing down on a small piston) tremendous hydraulic fluid pressure is created (standard 10,000 psi and up to 40,000 in laboratory systems) that when transferred into a cylinder creates the Lifting/Pushing Force required to do the desired work. It's actually little more than a fancy crowbar when you think about it...
Large, medium and small hand pumps are around in thousands of jacking applications where extraordinary lifting forces are needed, usually on an occasional basis, such as plant maintenance, pressing out bearings, pipe bending and precision laboratory testing. For more frequent use, air or electric pumps are more common - Pumping a hand pump a few times under load is okay now and again, but you don't want to do it all day long, you'd end up with a very sore arm.
Over the last couple of decades 2-Speed Pumps have been introduced that push a lot of oil through the system under no load (jacking the first couple of inches in dead air before the actual load is contacted) and then once the load has been reached switching over to standard mode - slow volume but much higher pressure. These have been great time and energy savers and if you are using larger, higher oil volume cylinders are well worth the additional cost.
JACKING SYSTEMS PAGE PUMPS PAGE
This page updated by Richard J. Tafilaw, February 1, 2008. Online since March 30, 1996
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