Valve openable in response to displacement of a cutting tool

Details Valve openable in response to displacement of a cutting tool Valve openable in response to displacement of a cutting tool

1989-07-10

1990-12-11

Kisliuk, Bruce M.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Cleansing fluid passage

175393, E21B 1060, E21C 3522

Patent

active

049764969

ABSTRACT:
A tool is mounted in a holder, the holder including a fluid passage for discharging drilling fluid toward a cutting zone. Fluid flow is regulated by a valve in the holder. The valve includes a housing and a valve element movable in the housing. The valve element opens the valve in response to rearward displacement of the tool relative to the holder. The housing of the valve is also rearwardly displaceable relative to the holder whenever rearward forces transmitted from the tool are excessive, thereby avoiding the occurrence of damage to the valve. The valve housing is yiealdably biased forwardly by fluid pressure in the conduit.

REFERENCES:
patent: 4456306 (1984-06-01), Wrulich et al.
patent: 4488759 (1984-12-01), Bergevist
patent: 4542942 (1985-09-01), Zitz et al.
patent: 4555143 (1985-11-01), Wrulich et al.
patent: 4569558 (1986-02-01), Hood
patent: 4664450 (1987-05-01), Radford

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