Method of providing a high pressure surge of working fluid to an

Details Method of providing a high pressure surge of working fluid to an Method of providing a high pressure surge of working fluid to an

1989-11-17

1990-09-25

Dang, Hoang C.

Boring or penetrating the earth

Boring without earth removal

173 1, 175 71, E21B 414

Patent

active

049586890

ABSTRACT:
A manually operated downhole for an underground earth boring apparatus having a pneumatically operated earth boring tool. A drill pipe is connected to the tool and to a source of pneumatic fluid. A valve is positioned in the drill pipe substantially adjacent to the tool between the tool and the source of pneumatic fluid. This downhole valve controls the flow of pneumatic fluid to the tool. The valve is operable in response to pushing or pulling on the drill pipe.

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Microtunnelling, Autumn, 1986, pp. 18, 19 and 21.
Russian Language advertisement, undated (translation enclosed).
"Sewer Mole Cracks Into Steady Routine", underground, Jul. 1986, pp. 18-21.

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