1.the common type and ventilated type.
2.long service life
3.construction tightly packed
4.seal completely sex good

The spirit moves the clutch with compressed air for friction clutch that manipulate the motive source.Used for needing to be delivered the big torque generally with turn round the directional equipments with the fast a transformation last such as, the petroleum artesian well machine, ships,

large machine pressure machine, scoop out the machine, ball whet machine, rubber machine etc.