CONTROL VALVE AND IMPACT DEVICE

Abstract: a control valve, an impact device for a rock breaking apparatus, and a method are provided. the control valve is an elongated piece with a central axis and radial outer and inner surfaces (ros, ris). the control valve includes several control surfaces disposed at axial distances from each other for controlling hydraulic fluid flows (hff) in response to axial control movement (m). one or more radial surfaces of the control valve include one or more slanted surface (ss) a longitudinal direction of which have oblique orientation in relation to the central axis (ca) of the control valve. the control valve rotates or turns during a working cycle due to hydraulic flow effecting on the slanted surfaces.

Inventor(s): Antti KOSKIMAKI, Timo KELA, Mikko HAMALAINEN, Lars KANDELIN

CPC Classification: B25D9/16 (PERCUSSIVE TOOLS {(percussive machines for forging ; hand-held drilling machines, in general , for wood ; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face )})

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