| 摘要 |
<p>An apparatus for controlling the flow of a medium. The apparatus comprises a base having a plurality of arms extending from the base. The base and arms define a cage. A valve member is positioned within the cage. The apparatus further includes a biasing housing disposed within the base, and wherein a spring is disposed within the biasing housing. The apparatus further includes a passageway formed about the valve member when the valve member is opened so that the medium flows on the outer portion of the biasing housing, and wherein the flow of the medium in an opposite direction urges the ball into engagement with the valve seat. When the valve is open, the medium collapses the spring and the valve member blocks the flow of the medium from entering the biasing housing. A method of drilling a well with the flow valve positioned on a work string is also disclosed.</p> |
