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:
“A photo of someone else’s childhood,
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yet the old man who has failed his memory
keens over the picture— ‘Them happy days—
gone—gone for ever!’”
—Denise Levertov (b. 1923)
“The power of this experience [fatherhood] can never be explained. It is one of those joyful codings that rumbles in the species far below understanding. When it is experienced it makes you one with all men in a way that fills you with warmth and harmony.”
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“... [ellipsis in source] it is true that the world was made in six days, but it was by God, to whose power the infirmity of men is not to be compared.”
—Elizabeth I (1533–1603)