Pressure reversing valve for a fluid-actuated, percussive...

Details Pressure reversing valve for a fluid-actuated, percussive... Pressure reversing valve for a fluid-actuated, percussive...

E - Fixed Constructions

21

B

E21B 4/00 (2006.01) B25D 9/14 (2006.01) E21B 4/14 (2006.01)

Patent

CA 2156167

A pressure sensitive valve (200) for a fluid-actuated percussive drill (10) includes passageways (44) for fluid flow to expose a valve surface to a burst of short-interval, high pressure fluid from a drive chamber (36) to cause early closing of the valve (200).

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