A pulley plays a vital role on belt driven piston and rotary screw compressors. A normal belt and pulley system is characterised by two or more pulleys in common to a belt. This allows for mechanical power, torque, and speed to be transmitted across axles. If the pulleys are of differing diameters, a mechanical advantage is realised.
A pulley can be tapered onto a tapered shaft, or it can be on a straight shaft with a taper lock bush to ensure the pulley is secure on the shaft. The ratio between the drive pulley and the driven pulley is important to ensure the compressor runs according to factory requirements and to generate the required air as per the original compressor design. If the pulley is incorrectly sized or not aligned correctly the compressed air output will be below the original level and the wearing parts will not last their usual lifespan.
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