Pressure reversing valve for a fluid-actuated, percussive drilli

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

1993-03-09

1994-04-12

Bui, Thuy M.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

166319, E21B 400

Patent

active

053017617

ABSTRACT:
A pressure sensitive valve for a fluid-actuated percussive drill includes passageways for fluid flow to expose a valve surface to a burst of short-interval, high pressure fluid from a drive chamber to cause early closing of the valve.

REFERENCES:
patent: 2937619 (1960-05-01), Kurt
patent: 4022108 (1977-05-01), Juvonen
patent: 4070949 (1978-01-01), Salmi
patent: 4179983 (1979-12-01), Wallace
patent: 4248133 (1981-02-01), Petukhov et al.
patent: 4465497 (1984-08-01), Howeth
patent: 4467699 (1984-08-01), LeBlanc
patent: 4706932 (1987-11-01), Yoshida et al.
patent: 4783043 (1988-11-01), Koerber
patent: 5085284 (1992-02-01), Fu

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