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Hydraulic pumps for torque tools and cylinders

A hydraulic pump supplies the pressure behind torque wrenches, cylinders, pullers and presses, and the duty of the job decides the type. Mains units run continuously through bolting sequences and press work, while a cordless pump keeps a small circuit live where there is no supply at the point of work.

Working pressure is the first figure to check. A 700 bar circuit needs pump, hose and couplings all rated to it, and mixing ratings is where jobs go wrong. Supply comes next: single-phase 230V units suit maintenance work and site power, while three-phase 400V units deliver the flow needed for larger cylinders and shorter cycle times. Oil capacity has to cover the full stroke of every cylinder on the circuit, plus a reserve.

Control follows the application. A solenoid valve with a pendant lets one person run a bolting sequence and read the gauge at the same time, and a digital gauge makes the applied pressure legible under load. Water transfer is a different job entirely, handled by a submersible pump or a domestic water pressure system.

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