US 2025/0187166 A1Published application

Control valve and impact device

AssigneeSandvik Mining and Construction Oy

InventorsAntti KOSKIMAKI, Timo KELA, Mikko HAMALAINEN, Lars KANDELIN

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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.

Claims13

Dependent claims

A control valve for a hydraulic impact device of a rock breaking apparatus (Rba), wherein the control valve is an elongated piece with a central axis and radial outer and inner surfaces, the control valve comprising:

several control surfaces located at axial distances from each other and arranged for controlling hydraulic fluid flows in response to an axial control movement, wherein the control valve is configured to be rotated hydraulically during operation of the impact device, wherein the control valve is without any transverse openings passing in the control valve in a transverse direction;
the at least one of the radial outer and inner including at least one slanted surface for generating torque for providing the hydraulic rotation, a longitudinal direction of which has an oblique orientation in relation to the central axis of the control valve;
the control valve being a control sleeve including a central axial opening configured to serve as a fluid passage.

Dependencies are inferred from the claim text.