Removable filter fluid flow shutoff apparatus

Details Removable filter fluid flow shutoff apparatus Removable filter fluid flow shutoff apparatus

1990-02-28

1991-06-04

Dang, Hoang C.

Boring or penetrating the earth

With above-ground means to impact an earth-penetrating means

173168, 175207, 175218, 175324, 210234, 210235, E21B 102, E21B 2106, E21B 2110

Patent

active

050206109

ABSTRACT:
A filter apparatus for a percussion device powered by fluid pressure includes a percussion device housing having a fluid inlet and a fluid outlet. A valve is displaced between an open and a closed position. A filter recess is formed within the housing. A filter is inserted within the filter recess for moving the valve from the closed to the open position, thereby permitting fluid pressure to be supplied from the inlet to the outlet.

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