Power
The tools operate on the basis of hydraulic fluid pressure of up to 720 bar (10,000 psi), which must be provided from a power source. At present, there are three different means of generating the pressure. The most commonly used source is a separate power unit, a small petrol (gasoline) engine connected to a hydraulic pump. The hydraulic fluid is pressurised in the pump, and conveyed in a hose under pressure to the tool.
Alternative power sources are a small electrical pump in the tool powered by a heavy duty rechargeable battery, and a hand- or foot-operated pump also connected to the tool directly. These are useful for lighter-duty use and do not require the storage space taken up by the separate power unit and associated lengths of hose.
Read more about this topic: Hydraulic Rescue Tools
Famous quotes containing the word power:
“With an eye made quiet by the power
Of harmony, and the deep power of joy,
We see into the life of things.”
—William Wordsworth (1770–1850)
“Generally speaking, the political news, whether domestic or foreign, might be written today for the next ten years with sufficient accuracy. Most revolutions in society have not power to interest, still less alarm us; but tell me that our rivers are drying up, or the genus pine dying out in the country, and I might attend.”
—Henry David Thoreau (1817–1862)
“I hate this shallow Americanism which hopes to get rich by credit, to get knowledge by raps on midnight tables, to learn the economy of the mind by phrenology, or skill without study, or mastery without apprenticeship, or the sale of goods through pretending that they sell, or power through making believe you are powerful, or through a packed jury or caucus, bribery and “repeating” votes, or wealth by fraud.”
—Ralph Waldo Emerson (1803–1882)