Control valve in a percussion device and a method comprising a closed pressure space at the end position of the piston
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United States of America Patent
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Feb 13, 2007
Grant Date -
Aug 10, 2006
app pub date -
Feb 23, 2004
filing date -
Feb 21, 2003
priority date (Note) -
Expired
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Abstract
The invention relates to a control valve, a percussion device and a method of controlling a working cycle of a percussion device. The percussion device (1) used for breaking rock comprises an impact element (8), which is controlled by a control valve (2). The control valve comprises a control element (5), which is arranged to control channels (7b) leading to a working pressure surface (9) of the impact element (8). The movement of the control element to its extreme position is arranged to form a closed pressure space, where pressure medium compresses and converts kinetic energy of the control element into pressure energy. The pressure energy is re-converted into kinetic energy and utilized when the control element changes its direction.
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