The impact, similar to a hammer, is created by the piston. With PKL 190 – 740 the impact is produced directly against the surface upon which the impactor is mounted. From PKL 1000 to PKL 5000 and PKL 10000 the piston hits the base plate. The compressed air pushes the piston against one or two springs.
The fast evacuation of the piston chamber causes the piston to strike abruptly against the impact surface. Series PKL interval impactors can be operated using non-lubricated compressed air.