Fluid pressure actuated by-pass and relief valve

Details Fluid pressure actuated by-pass and relief valve Fluid pressure actuated by-pass and relief valve

1979-03-23

1981-06-30

Leppink, James A.

Boring or penetrating the earth

Automatic control

Of boring means including a below-ground drive prime mover

166318, 166319, 175107, 60468, 173 64, E21B 312

Patent

active

042757959

ABSTRACT:
A fluid pressure actuated by-pass and relief valve are positioned between a source of fluid under pressure and the hollow interior of a rotor in a fluid pressure actuated downhole drilling motor. The valve includes a hollow mandrel with an inlet opening at one end and an outlet opening at the other end connected to the rotor interior and slidably received in a movable sleeve. Fluid pressure at a first predetermined value moves the mandrel into the sleeve to block the inlet opening such that the fluid by-passes the valve and flows between the stator and the rotor to rotate a bit. Fluid pressure at a higher second predetermined value moves the sleeve relative to the mandrel to expose the inlet opening and relieve the fluid pressure on the rotor and the stator. The movement of the sleeve exposes a greater surface area thereof to the fluid pressure such that a spring moves the sleeve back to block the inlet opening only at an intermediate third predetermined fluid pressure value. A second spring moves the mandrel relative to the sleeve to expose the inlet opening when the fluid pressure falls below the first predetermined value. In two alternate embodiments, the mandrel cooperates with a stationary sleeve and the movable sleeve cooperates with a second inlet opening to separate the by-pass and relief functions.

REFERENCES:
patent: 2879032 (1959-03-01), Whittle
patent: 2963099 (1960-12-01), Glanelloni, Jr.
patent: 3802515 (1974-04-01), Flamand et al.
patent: 3840080 (1974-10-01), Berryman

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