Check valve for rock drill

Details Check valve for rock drill Check valve for rock drill

1978-05-24

1980-01-22

Purser, Ernest R.

Boring or penetrating the earth

With means movable relative to tool or shaft to control...

175318, 175339, 166325, 137541, 137549, E21B 3900

Patent

active

041845544

ABSTRACT:
A check valve for a rock drill comprises a valve plate carrying a cylindrical strainer. An insert is carried by the valve plate and is movable between valve-open and valve-closed positions. A spring biases the insert to a valve-closed position. The insert unit includes a lid which engages and covers the top of the strainer in a valve-open position, and a bottom plate which covers the valve plate in a valve-closed position to prevent cuttings from fouling the valve mechanism.

REFERENCES:
patent: 1687120 (1928-10-01), Blanchard
patent: 1692265 (1928-11-01), Blom
patent: 2619316 (1952-11-01), Wilson
patent: 3401758 (1968-09-01), Talbert
patent: 3924695 (1975-12-01), Kennedy

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