Petzl Professional 2015 | Page 105

PULLEYS

SLFD training center, Salt Lake City, Utah, USA © Petzl / John Evans

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Pulleys are used to haul up equipment or raise a person in a rescue situation. Some pulleys have an integrated rope clamp
to make certain tasks easier. Certain pulleys also allow for movement along a rope or cable: for moving loads or evacuating a
person.

Two factors determine a pulley’s
efficiency:
• Sheave size: the larger the sheave
diameter, the higher the efficiency
• Bushings and bearings:
- self-lubricating bushings are
efficient, but they must be regularly
maintained
- sealed ball bearings are very
efficient, and they do not require any
maintenance

For easier selection of the
appropriate pulley for each need, all
Petzl pulleys with ball-bearings are
identified by a symbol:

The second symbol represents the
maximum rope diameter to be used
with each pulley: