You are looking for a pump that is not conventional as the majority of pumps and cylinders are around 2500 psi. as you obviously know. So it might be worth your while to look at putting two smaller conventional cylinders in tandem to achieve the 50 ton force. Just a thought. I work on molding presses that for the most part have gone away from one big cylinder to two smaller ones using more conventional pressure to achieve their rating. Those that use higher pressures, use a high volume pump to move the cylinder and then switch to a smaller high pressure pump to hold the cylinder at the higher pressures once full movement is achieved. Most of these are rated at 3000 psi. working pressure although they can go higher, but that means a shorter life.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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