Downhole surge valve for earth boring apparatus

Details Downhole surge valve for earth boring apparatus Downhole surge valve for earth boring apparatus

1988-12-30

1990-05-29

Dang, Hoang C.

Boring or penetrating the earth

Boring without earth removal

166334, 175 93, 175 94, 175232, 175234, 175296, 175317, 175321, 175324, 251347, E21B 414, E21B 2110

Patent

active

049287753

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. 18-21.
Russian language advertisement, undated.
"Sewer Mole Cracks into Steady Routine", Underground, Jul. 1986, pp. 18-21.

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