Pressure reversing valve assembly for a down-the-hole percussive drilling apparatus
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United States of America Patent
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Jan 21, 2014
Grant Date -
Dec 8, 2011
app pub date -
Jun 4, 2010
filing date -
Jun 4, 2010
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Abstract
A pressure reversing valve for a down-the-hole percussive drilling (“DHD”) apparatus has a first valve pressure surface, a second valve pressure surface and a third valve pressure surface. The first valve pressure surface engages an internal surface of a housing of the DHD hammer. The second valve pressure surface is in communication with a high pressure port of the DHD hammer. The third valve pressure surface is in communication with a passageway that extends through a distributor within the DHD hammer. The valve also includes a valve passageway that extends through the valve and which is in communication with a first volume of the DHD hammer. The first volume is formed by surfaces of the distributor and the third valve pressure surface.
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