two cylinders, two rams and a storage device

a cylinder and a ram

two co-axial rams and two cylinders

a cylinder, a piston, storage tank and control valve

accumulating oil

supplying large quantities of oil for very short duration

generally high pressures to operate hydraulic machines

supplying energy when main supply fails

waste valve closes suddenly

supply pipe is long

supply pipe is short

ram chamber is large

1:1

2:1

3:2

2:3

2000-3000 kg/pm2

3000-4000 kg/cm2

4000-4500 kg/cm2

7500-10,000 kg/cm2