Erosion resistant check valve assembly

Details Erosion resistant check valve assembly Erosion resistant check valve assembly

1979-10-09

1981-04-28

Cline, William R.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

1375195, 166328, F16K 1504

Patent

active

042639360

ABSTRACT:
An inside blowout preventer assembly for connection into an earth boring drill string has improved features for preventing erosion. The blowout preventer assembly allows downward flow during normal drilling, but prevents upward flow if the flow rate is above a selected amount, to prevent a blowout. The assembly includes a valve body with a longitudinal passage having a throat section. A recess passage intersects the throat section and contains a ball. The ball is movable from the recess passage into the throat section, where it seals against a seat to stop upward flow. An equalizing passage of selected size and configuration extends from the base of the recess passage to the longitudinal passage. The ball is of lesser diameter than the recess passage for allowing downward flow through the recess passage and the equalizing passage. This prevents the ball from being drawn by pressure differential into the throat section during downward flow, reducing turbulence and erosion.

REFERENCES:
patent: 2191702 (1940-02-01), Yowell
patent: 3584645 (1971-06-01), Radig
patent: 3850191 (1974-11-01), Brown

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